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Reduction of carboxamides is an efficient approach to obtain the corresponding amines, albeit it is one of the most problematic. In this work, by use of pinacolborane (HBpin) as a reductant, the rare‐earth metal tris (arylamido) complex supported by a ferrocenyl‐modified arylamido ligand La[NH‐2,6‐iPr2‐4‐FcC6H2]3 was employed as a precatalyst for primary and secondary amide reductions. This catalyst system exhibited high activity toward hydroborative reduction of amides to amines under mild conditions, as well good tolerance for heteroatoms and functional groups in the reduction. A lanthanide hydride was experimentally verified as the active species and the reduction mechanism was proposed. [ABSTRACT FROM AUTHOR]

Nano‐sized bivalent metal complexes, specifically [M(L)2] with L = 2‐((E)‐((4,5‐dimethyl‐2‐(((E)‐4‐methylbenzylidene)amino)phenyl)‐imino)methyl)benzenethiol] (C23H22N2S) and M = Cu (II) (C1), Co (II) (C2), Ni (II) (C3), and Zn (II) (C4), underwent synthesis and subsequent characterization. Elemental analyses, infrared, NMR, mass, electronic, magnetic susceptibility, conductivity assessments, and X‐ray diffraction studies were used to assess our bivalent metal complexes. DFT studies were used to study the tautomeric equilibrium of the tridentate thio‐Schiff base ligand (HL), via the DFT\B3LYP method in connection with a 6–311G* correlation consistent basis set. Two tautomers, which are thione and thiol forms, were studied to estimate the predominant one. The metal formed four coordinated with the tridentate N2S donor thio‐Schiff base to form octahedral geometry complexes. The SEM, TEM, XRD, AFM, and EDX of the studied complexes unveiled distinct and strong diffraction peaks, signifying their crystalline nature and providing evidence of their particle sizes being within the nano‐size. The crystal sizes calculated for all complexes were determined to be ranging from 27.73 to 76.39 nm. The interactions between metal complexes and calf thymus DNA, and their potential for mimicking insulin activity, were investigated in a controlled lab setting by measuring their ability to inhibit alpha‐amylase. The antimicrobial potential of thio‐Schiff base ligand (HL) plus complexes (C1–C4) were tested. The viscosity and UV–Vis absorption determinations were utilized to assess the calf thymus DNA (CT‐DNA) interaction with the nano‐sized metal (II) chelates. Our flow cytometry data indicate significant levels of apoptosis and cell cycle arresting in both liver and breast cancer cell lines. [ABSTRACT FROM AUTHOR]

2‐Aminophenol‐based Schiff bases and their metal complexes have drawn a lot of interest because of their wide range of biological activity and their uses in several fields. These Schiff bases are synthesized through the condensation of 2‐aminophenol and various carbonyl compounds, and metal complexes formed easily by coordinating Schiff bases with transition metal ions possess a wide range of intriguing properties that have rendered them promising candidates in biomedical research. These compounds have a diverse array of captivating biological properties including antibacterial, antifungal, anticancer, and antioxidant actions. Their versatile nature and potential for tailored modifications hold the promise for innovative biomedical applications. Compared to standard antibiotics and other studied compounds, C2, C8–C11, and C116 complexes, along with L16 and L17 ligands, exhibit the highest antibacterial activity, while C3 and C115 complexes demonstrate the highest antifungal activity. The metal chelate formation of the ligands enhanced the antimicrobial activity by increasing their lipophilic nature. C66, C76, and C112 complexes and L39 ligand showed higher anticancer activity than standard anticancer drugs. The metal complexes have higher anticancer activity than the ligand due to improved permeability and cellular uptake. The anticancer activity of the complexes is related to the substituents of the Schiff base ligands. In compounds containing an electron‐withdrawing group (e.g., Cl or Br or NO2), the activity is obviously better than others. Ligands L1–L3 and L5, L6, and L32 demonstrated the most potent antioxidant activity, surpassing both metal complexes and standard conventional antioxidants. The ligands showed greater antioxidant activity than the metal complexes due to their capability of donating free protons to scavenge free radicals. More study is needed to fully explore the potential of 2‐aminophenol‐based Schiff bases and their transition metal complexes for the development of new drugs. This review summarizes different synthetic methods, biological activities, and the structure–activity relationship. This study aims to conduct further research on 2‐aminophenol‐based Schiff bases and their metal complexes. [ABSTRACT FROM AUTHOR]

The escalating fascination with Schiff bases stems from their versatile applications in medicine, pharmacology, biology, fine organic synthesis, and industrial processes. This minireview seeks to provide an in‐depth exploration of the synthesis of Schiff bases, specifically focusing on their derivation from 3‐aminopropylalkoxysilanes or 3‐aminopropylsilatranes. Additionally, the review delves into the utilization of Schiff bases in crafting metal complexes, unraveling their practical significance in various domains. Spanning from 1995 to 2024, this review is aimed at encapsulating the evolution of knowledge and advancements in the chemistry of Schiff bases during this period. [ABSTRACT FROM AUTHOR]

Constrained geometry complexes (CGCs) are homogeneous olefin polymerization catalysts that have been improved because of their considerably high activity and their copolymerization abilities for ethylene with α‐olefins. The ancillary ligands in CGCs comprise bridged 6π‐electron moieties (e.g., cyclopentadienyl (Cp) and fluorenyl) and amide donors. In this study, we investigated the effect of changing the 6π‐electron moieties to a diphenylmethyl moiety (Ph2C) on the polymerization activity of [Me2Si(Ph2C)(tBuN)]ZrCl2(thf) (thf = tetrahydrofuran). We synthesized [Me2Si(Ph2C)(tBuN)]ZrCl2(thf) and characterized it via 1H nuclear magnetic resonance analysis and single‐crystal X‐ray crystallography. Ethylene polymerization at 2 MPa using a catalyst of the [Me2Si(Ph2C)(tBuN)]ZrCl2(thf) and modified methylaluminoxane (MMAO) as a cocatalyst yielded a linear polyethylene (PE) with a high melting point (124°C–134°C); moreover, the polymerization activity of the catalyst was found to be up to 445 g (PE) mmol (Zr)−1 h−1. The polymerization of styrene using the zirconium complex and MAOs did not proceed, but the polymerization of 1,3‐butadiene produced a small amount of polybutadiene with ~60% cis‐1,4‐structure. These results indicate that non‐Cp‐type CGCs, which can be defined as metal complexes bearing an ancillary ligand in which non‐Cp moieties (benzyl moiety in this study) and an amido group are bridged by an organic linker, can become a new family of homogeneous olefin polymerization catalysts. [ABSTRACT FROM AUTHOR]

N‐Methylbenzylamine and ethylenediamine were utilized as primary and auxiliary ligands, respectively, alongside metal salts to synthesize ternary metal complexes: [FeCl3(Nmba)(en)], [CoCl2(Nmba)(en)(H2O)] and [CuCl2(Nmba)(en)(H2O)]. These complexes were thoroughly characterized using spectral and analytical techniques, revealing an octahedral geometry for all. Coats–Redfern calculations indicated their non‐spontaneous nature yet highlighted their thermal stability. DNA binding studies unveiled a groove binding mode for the complexes, with intrinsic binding constants (Kb) and Stern–Volmer quenching constant (Ksq) supporting their strong binding capabilities. Nuclease activity against pBR322 was assessed through gel electrophoresis. Additionally, docking studies using AutoDock 4.2 software provided insights into their binding affinities. In terms of biological activities, the Cu complex demonstrated superior cytotoxicity and antibacterial and antifungal properties compared to the other ternary metal complexes. This suggests its potential for further exploration in biomedical applications. [ABSTRACT FROM AUTHOR]

A P-ylide Ru(II) bipyridyl complex was readily synthetized and fully characterized, constituing one of the rare examples of photoluminescent metal ylide complexes. Its photophysical and redox properties have been compared with those of related NHC and cyclometalated Ru complexes and exploited in visible-light photocatalyzed SET and EnT processes. [ABSTRACT FROM AUTHOR]

Reactions of the yttrium complex [AdNPPh2]3Y (1) with CoCl2 and FeCl2 led to the isolation of a heterobimetallic Y(III)–Co(II) complex and a diiron complex [AdNPPh2]3Fe2Cl (4), respectively. In the presence of KC8/18-c-6 as a reductant, the reaction of 1 with CoCl2 afforded a dicobalt complex [AdNPPh2]3Co2ClK(18-c-6) (3). These reactions proceeded via ligand redistributions caused by halide abstraction from the Lewis acidic and electropositive Y(III) center. Treatment of the β-diketiminato yttrium complex LnacnacY[PhNCH2PPh2]2 (5) with FeCl2 led to the formation of the complex [PhNCH2PPh2]2[PhN(Ph)NCH2PPh2]Fe2Cl (6), via ligand redistribution and P–C bond cleavage. All complexes are paramagnetic and are characterized by X-ray diffraction studies. [ABSTRACT FROM AUTHOR]

Phosphine oxides are an interesting class of compounds possessing tetracoordinate and pentavalent phosphorus atoms and have been employed in a wide range of applications including reagents in organic synthesis, metal extractants, flame retardants, pharmaceuticals, and bioactivity studies. Among all, the degree of basicity of phosphoryl oxygen driven by the nature of substituents influences the electronic properties of the central metal in a complex toward the diversified catalytic processes. Further, the presence of heteroatoms adjacent to the central phosphorus atom enhances the nucleophilicity of the phosphoryl oxygen atom. In view of this, the present review covers the past two decades of remarkable catalytic versatility of P=O‐based metal complexes and describes the governing factors influencing the structural properties and the resultant coordination behavior. Interestingly, some of the P=O bond distances of metal complexes are either longer or shorter compared to their free ligands, indicating the catalytic activity. These complexes can effectively catalyze a wide range of chemical reactions including polymerizations, C−C and Si−C bond activations, oxidation, reduction, hydroformylation, hydrophosphination, hydrogenation and cyclization reactions. Furthermore, this review emphasizes the impact of substituents, solvents, additives, light, and temperature on the catalytic efficiency. [ABSTRACT FROM AUTHOR]

A diprotic bis(β-thioketoimine) ligand precursor featuring a flexible 4,4'-methylbis(aniline) linker, H22, was synthesised via treatment of the corresponding bis(β-ketoimine) with Lawesson's reagent. Lithiation of H22 and coordination with one equivalent of d-block metal(II) chlorides MCl2(THF)x (M = Fe, Co and Zn) yielded a corresponding series of homoleptic dinuclear complexes, [M2(μ-2)2]. X-ray diffraction analysis reveals a tetrahedral geometry for the two metals and a double-stranded helicate structure arising from inter-strand face-face π-stacking. These interactions create a helical 'twist' of ca. 70°. Utilising a bulky mononucleating β-thioketoiminate ligand, [3]-, the analogous series of homoleptic monometallic complexes, [M(3)2] (M = Fe, Co and Zn), were prepared and characterised by spectroscopic and analytical techniques. A comprehensive DFT study of all complexes reveals a stronger M-S bonding compared to M-N due to a higher degree of covalency. Solution magnetic studies and natural bonding orbital calculations on the mono- and dinuclear iron and cobalt complexes are consistent with high-spin tetrahedral Fe(II) and Co(II) centres, and cyclic voltammetry reveals both oxidation and reduction processes are accessible. [ABSTRACT FROM AUTHOR]

Electron transfers in multinuclear metal complexes are the origin of their unique functionalities both in natural and artificial systems. However, electron transfers in multinuclear metal complexes are generally complicated, and predicting and controlling these electron transfers is extremely difficult. Herein, we report the precise manipulation of the electron transfers in multinuclear metal complexes. The development of a rational synthetic strategy afforded a series of pentanuclear metal complexes which composed of metal ions and 3,5‐bis(2‐pyridyl)pyrazole (Hbpp) as a platform to probe the phenomena. Electrochemical and spectroscopic investigations clarified overall picture of the electron transfers in the pentanuclear complexes. In addition, unique electron transfer behaviors, in which the reduction of a metal center occurs during the oxidation of the overall complex, were identified. We also elucidated the two dominant factors that determine the manner of the electron transfers. Our results provide comprehensive guidelines for interpreting the complicated electron transfers in multinuclear metal complexes. [ABSTRACT FROM AUTHOR]

Alzheimer's disease (AD) is a kind of neurodegenerative diseases characterized by beta-amyloid deposition and neurofibrillary tangles and is also the main cause of dementia. According to statistics, the incidence of AD is constantly increasing, bringing a great burden to individuals and society. Nonetheless, there is no cure for AD, and the available drugs are very limited apart from cholinesterase inhibitors and N-Methyl-D-aspartic acid (NMDA) antagonists, which merely alleviate symptoms without delaying the progression of the disease. Therefore, there is an urgent need to develop a medicine that can delay the progression of AD or cure it. In recent years, increasing evidence suggests that metal complexes have the enormous potential to treat AD through inhibiting the aggregation and cytotoxicity of A β , interfering with the congregation and hyperphosphorylation of tau, regulating dysfunctional synaptic and unbalanced neurotransmitters, etc. In this review, we summarize the current metal complexes and their mechanisms of action for treating AD, including ruthenium, platinum, zinc, vanadium, copper, magnesium, and other complexes. [ABSTRACT FROM AUTHOR]

ABSTRACT Metal (Co3+, Ni2+, and Pt2+)–centered and noncentered ferrocene–Schiff bases were prepared. They have been structurally characterized by spectroscopic methods, elemental analysis, conductivity, and magnetic moment. Electron spin resonance was used for the characterization of the Co3+‐centered complex. All synthesized compounds showed antibacterial activity against all tested Gram‐positive and Gram‐negative strains, as well as potent antifungal effect against Candida species. Remarkably, these compounds demonstrated greater efficacy against Gram‐positive bacteria than Gram‐negative. Without an additional oxidant or reductant, the compounds exhibited DNA cleavage capability in the dark. The development of synthesized novel chemical compounds having DNA cleavage and antimicrobial activity plays a profound role in the advancement of medical therapeutics. [ABSTRACT FROM AUTHOR]

Circularly polarized luminescence (CPL) materials hold significant promise in multidisciplinary fields such as circularly polarized organic light‐emitting diodes, biological probes, data storage, and information encryption. However, these cutting‐edge applications also put forward higher requirements for the design of CPL materials, requiring large dissymmetry factor and high emission quality. For this purpose, diverse approaches have been explored to generate and enhance CPL emission. Among them, energy transfer (ET) strategy stands out as it can be readily implemented in a wide range of CPL materials. The present work overviews latest advances in energy transfer for generating and modulating CPL, involving small organic molecules, polymers, metal complexes, liquid crystals, as well as new‐emerging chiral luminescent materials. It is anticipated that the review article will garner increased attention toward energy transfer systems and facilitate the advancement of CPL materials. [ABSTRACT FROM AUTHOR]

For decades, the synthesis of 2‐quinolones, a crucial structural motif in pharmaceuticals and agrochemicals, has relied heavily on costly noble metal complexes and structurally complex ligands. Despite considerable efforts from synthetic chemists, a mild, metal‐free, environmentally friendly, and cost‐effective approach has remained elusive. This study introduces a robust, metal‐free synthetic platform that leverages an innovative organoiodine‐catalyzed electrophilic arene C(sp2)−H amination strategy to efficiently produce a wide range of new and modifiable 2‐quinolones. Moreover, this study allows ready synthetic access to novel 8‐aryl‐substituted 2‐quinolones, uncovering new chemical spaces with significant potential for medicinal applications. [ABSTRACT FROM AUTHOR]

A new family of stable radical‐containing polytopic ligands based on tris(2‐pyridylmethyl)amines TPMA architecture and their corresponding metal complexes have been synthesized. These molecular systems offered the possibility to investigate how various spin carriers, such as the metal ion and the organic radical, influence their EPR properties mainly through the empirical ratio of peak heights d1/d. Moreover, it has been possible to analyze how different conformations of TEMPO radical units in the molecular skeleton affect the metallic system. [ABSTRACT FROM AUTHOR]

Compared with aggregate spin behavior, single‐molecule spin behavior can be accurately understood, controlled, and applied at the level of basic building blocks. The potential of single‐molecule electronic and nuclear spins for monitoring and control represents a beacon of promise for the advancement of molecular spin devices, which are fabricated by connecting a single molecule between two electrodes. Metal complexes, celebrated for their superior magnetic attributes, are widely used in the devices to explore spin effects. Moreover, single‐molecule electrical techniques with high signal‐to‐noise ratio, temporal resolution, and reliability help to understand the spin characteristics. In this review, the focus is on the devices with metal complexes, especially single‐molecule magnets, and systematically present experimental and theoretical state of the art of this field at the single‐molecule level, including the fundamental concepts of the electronic and nuclear spin and their basic spin effects. Then, several experimental methods developed to regulate the spin characteristics of metal complexes at single‐molecule level are introduced, as well as the corresponding intrinsic mechanisms. A brief discussion is provided on the comprehensive applications and the considerable challenges of single‐molecule spin devices in detail, along with a prospect on the potential future directions of this field. [ABSTRACT FROM AUTHOR]

The development of lead-free primary explosives is urgent from industrial and military aspects. Herein, a typical energetic molecule with the dinitromethyl group and tetrazole ring was selected as the ligand for different alkali metals (Na, K, Rb, and Cs) to achieve a series of energetic coordination polymers (ECPs), namely, ECP 1 to ECP 4. The DNMT molecule showed outstanding coordination ability with metal ions to form diverse metal complexes and coordination frameworks. It was found that the conformation of the energetic ligand as well as the framework structure can be tuned by the deprotonation of DNMT and the corresponding metal centers. Interestingly, a rare metal–π(tetrazole) coordinate bond was also observed in ECP 3, which is valuable for designing new ECPs and energetic metal complexes (EMCs). A new method has been developed for predicting the energetic properties of EMCs and ECPs. The calculation results indicate that the DNMT-based ECPs have good detonation performance and can be used as lead-free primary explosives. Moreover, the perforated lead plate test reveals the extensive application of the DNMT-based ECPs in emerging laser-initiated explosives. Compared to pure DNMT, the DNMT-based ECPs show significantly enhanced thermal stability. The mechanisms behind different detonation performances and thermal stabilities among the DNMT-based ECPs were also discussed. All the results will be valuable for the future development of ECPs in the applications of lead-free primary explosives. [ABSTRACT FROM AUTHOR]

Dinuclear metal synergistic catalysis (DMSC) has been proved an effective approach to enhance catalytic efficiency in photocatalytic CO2 reduction reaction, while it remains challenge to design dinuclear metal complexes that can show DMSC effect. The main reason is that the influence of the microenvironment around dinuclear metal centres on catalytic activity has not been well recognized and revealed. Herein, we report a dinuclear cobalt complex featuring a planar structure, which displays outstanding catalytic efficiency for photochemical CO2‐to‐CO conversion. The turnover number (TON) and turnover frequency (TOF) values reach as high as 14457 and 0.40 s−1 respectively, 8.6 times higher than those of the corresponding mononuclear cobalt complex. Control experiments and theoretical calculations revealed that the enhanced catalytic efficiency of the dinuclear cobalt complex is due to the indirect DMSC effect between two CoII ions, energetically feasible one step two‐electron transfer process by Co2I,I intermediate to afford Co2II,II(CO22−) intermediate and fast mass transfer closely related with the planar structure. [ABSTRACT FROM AUTHOR]

The catalytic asymmetric electrophilic functionalization of the less reactive N-heteroaromatic compounds has been reported using the approach of the introduction of an exocyclic amino substituent. This strategy has allowed enantioselective Friedel–Crafts alkylation in pyrazoles, isoxazoles and isothiazoles, as well as in aminoindoles, aminobenzofurans and aminobenzothiophenes. Several stereoselective methods have been used for the 1,4-addition or 1,2-addition of these heteroaromatic compounds to different electrophiles employing organocatalysts or chiral metal complexes. The activating exocyclic amino substituent has also been used as a nucleophile in tandem reactions, including formal cycloadditions ([3+2] and [3+3]), for the synthesis of highly functionalized chiral nitrogen heterocycles. [ABSTRACT FROM AUTHOR]

Catalytic hydrogenation is one of the most important transformations in both academia and industry. Compared with direct hydrogenation with molecular hydrogen or transfer hydrogenations with hydrides, electrohydrogenation provides an alternative and practical pathway using proton as the hydrogen source. In this review, we have summarized the recent advances in electrohydrogenations of polar and non‐polar unsaturated compounds catalyzed by earth‐aubundant metal complexes. In addition, we also present a detailed discussion of the scope and limitations, plausible mechanisms and the opportunities for further development. [ABSTRACT FROM AUTHOR]

Amino acids and peptides are readily available biomolecules and can function as chiral ligands for transition metal catalysis. An example is the copper complex catalyzed 1,4-addition of dialkylzinc to acyclic enones, which employs peptide ligands. This review provides a dataset of amino acids and peptides reported in the literature proving to be effective ligands for metal-centered catalysts. Several parameters were highlighted, including amino acid combination, metal atoms, carboxyl and amino protecting groups, modification of natural amino acids, and the mechanism of catalysis. Along with analyzing physical-chemical properties, the SMILES representation for each amino acid and/or peptide was generated and made available online, providing an easy-to-use means of training machine learning models. This review offers an opportunity for the development of more efficient peptide ligands for enantioselective metal-centered catalysts. The available online dataset is a reliable manually curated table, it enables the benchmark for comparison of new terminal functional groups. Moreover, the review provides insight into the structures of the more successful peptide ligands and can be used as the foundation for the development of the next generation of peptide-based chiral ligands. [ABSTRACT FROM AUTHOR]

In recent years, parahydrogen‐induced hyperpolarization has become a focus for future medical applications. Similar to the established dynamic nuclear polarization method, a biocompatible bolus from a hyperpolarized sample can be produced for in vivo studies. However, this requires removing toxic hydrogenation catalysts, which inevitably must be used. Additionally, the ratio between the substrate to be hyperpolarized (e. g. pyruvate) and a mandatory catalyst must also be maintained. Even the smallest differences can lead to a reduction in generated signal amplification. In particular, weighing small amounts of catalysts leads to inaccuracies in sample preparations. Fluorescence spectroscopy provides a rapid and sensitive enough approach to determine catalyst concentration. The Ir‐IMes metal complexes used in SABRE lead to a quenching of the fluorescence of the solvent, dependent on its concentration. This can be used to quickly estimate the actual concentration in a solution with very small quantities of catalysts. Hence, fluorescence spectroscopy offers a rapid and reliable quality control method for the preparation of samples to be hyperpolarized. In addition, it can also be used as a quality control method to assess filtration efficacy before administration of hyperpolarized samples. [ABSTRACT FROM AUTHOR]

Throughout history, metal-based coordination compounds have been used for medical purposes, including the treatment of various illnesses like cancer. Since the discovery of cisplatin in 1965, many other metal coordinating complexes have been developed and evaluated, involving metals such as platinum, iron, zinc, ruthenium, gold, silver, titanium, and copper. The goal behind these efforts is to create effective and safe medications. At the moment, there are a lot of studies talking about the use of cytostatic metal complexes, mainly on promising platinum- and non-platinum-based drugs in both preclinical and clinical trials. However, there is a lack of recent comprehensive studies that cover both the chemical and biological aspects of metal-based coordinating molecules in the context of cancer therapy. This review aims to provide a thorough analysis of the coordination chemistry of existing and innovative cytostatic substances. It will include a description of their design and synthesis, as well as a summary of the biochemical reactivity and physicochemical features of potential metal-containing complexes. [ABSTRACT FROM AUTHOR]

Scientists are searching for reactive oxygen species, which have been associated with various health issues like heart problems, neurological disorders, inflammation, and aging. Salen complexes have proven to be effective in multiple oxidative stress situations and have been used as catalase and superoxide mimetics. To explore this further, three mixed complexes were synthesized using a Schiff base (salen) and a sugar (d-glucose) with Co(II), Ni(II), and Cu(II) ions. These complexes were then diagnosed by different analytical and spectral techniques. Stoichiometry, stereochemistry, some physical properties, and the method of bonding complexes were measured. Comparisons of the IR and 1HNMR spectra of the ligands with the complexes demonstrated the involvement of the azomethine group of the ligand in the chelation process. The mass spectra and TGA agree with the proposed formula of the complexes, and the conductivity and UV–Vis data supported the octahedral geometry of the complexes, and information was obtained from partial parameter calculations by molecular modeling. The metal complexes exhibited strong antimicrobial and antioxidant properties when compared to standard drugs. The like-superoxide and catalyst mimetic complexes were screened using DPPH ABTS, revealing their effectiveness. [ABSTRACT FROM AUTHOR]

In recent times, there has been a growing exploration of transition metal complexes as potential solutions for significant health challenges, including tuberculosis, microbes infection, and inflammation. Therefore, in our ongoing effort to identify biologically effective agents, Co(II), Ni(II), Cu(II), and Zn(II) metal complexes of H2L1–H2L2 hydrazone ligands were synthesized. The structural features of synthesized compounds were recognized by employing several techniques such as FT‐IR, 1H NMR, 13C NMR, powder x‐ray diffraction (XRD), UV‐Vis, ESR, TG‐DTA, mass spectrometry, and molar conductance measurements. The bonding of ligands via Ophenolic, Oenolic, and Nazomethine donor atoms and the attachment of the three water molecules with metal ion to form the octahedral structure of complexes were corroborated by different spectroscopic techniques. The anti‐tuberculosis, antimicrobial, and anti‐inflammatory activities of the synthesized compounds were assessed using the microplate alamar blue assay, serial dilution, and bovine serum albumin (BSA) methods, respectively, and highlighted the more potency of the complexes than ligands. The synthesized Cu(II) (9) and Zn(II) (10) metal complexes exhibited excellent ability to inhibit the growth of H37Rv strain of Mycobacterium tuberculosis in comparison to standard drug streptomycin. The Cu(II) (6 and 9) and Zn(II) (10) complexes showed superb ability as antimicrobial agents, whereas Cu(II) (5) and Zn(II) (6) complexes exhibited significant anti‐inflammatory ability. The in vitro findings on the antituberculosis activity were reinforced by a significant molecular docking study, which has become a crucial component of computational research utilizing the enzyme Mtb Pks13 thioesterase domain of M. tuberculosis. Additionally, in this research work, the absorption–distribution–metabolism–excretion–toxicity (ADMET) study sparked the compounds' drug‐like behavior. [ABSTRACT FROM AUTHOR]

Two novel complexes were synthesized by the reaction of benzothiazol‐pyrimidin‐2‐ylidene ligand (BTP) with Pd (II) and Fe (III) ions. A variety of various spectral and analytical methods (infrared, 1H/NMR, 13C/NMR, electronic spectra, CHN analyses, mass spectra, thermogravimetric analysis, and magnetic susceptibility) were used to characterize the investigated BTP ligand and its complexes. Correlation of experimental results with density functional theory calculation proves that the geometry of BTP‐Fe complex is octahedral, whereas BTP‐Pd complex is square planner. The catalytic effectiveness of BTP complexes were tested for three‐component condensation process under moderate and environmentally friendly reaction conditions. Moreover, the effects of different Lewis acid, basic, and ionic liquid catalysts, as well as solvent and catalyst dose on the catalytic reaction were investigated. Both catalysts demonstrated strong catalytic capability in the carefully regulated ideal reaction circumstances. Heterogeneous catalyst BTP‐Pd exhibited superior catalytic performance compared to homogeneous catalyst BTP‐Fe. All products were obtained in high TOF (turnover frequency) numbers in the presence of these catalysts, which indicate the high efficiency of these catalysts in the synthesis of dihydro‐7H‐5‐thia‐hexaaza‐s‐indacen‐6‐one derivatives. Moreover, the two catalysts' recycling and reusability in reactions were also investigated. Heterogeneous BTP‐Pd catalyst could be reused up to seven times with high efficiency, but the homogeneous catalyst (BTP‐Fe) could only be recycled up to four times. Furthermore, the mechanism of catalytic reaction was suggested and supported by DFT calculation. The simplicity, safety, stability, use of commercially available catalysts, quick reaction times, and excellent yields make it promising for future industrial use. [ABSTRACT FROM AUTHOR]

Schiff bases have proven to be beneficial in medicine and have interesting complexation capabilities with transition metals. The +4, +5, and +6 oxidation states of schiff base metal complexes have been the subject of recent review, which have highlighted their notable cytotoxic effects against various colon cancer cell lines (HT-29, HCT-116, SW-480, Coco-2, CT-26, LT-174, LoVo). Extensive research has focused on schiff base metal complexes in the +4 and +6 oxidation states, exhibiting distinct geometries and significant thermodynamic stability. These studies provide IC50 values for these complexes in colon cancer cell lines along with comprehensive structural representations that shed light on how different substituents affect cytotoxicity. When compared to schiff base ligands alone, metal complexes of schiff bases have been shown to significantly reduce colon cancer cell invasion and proliferation. The studied literature emphasizes schiff base metal complexe’s potential in biological applications and suggests that more study may be necessary to fully comprehend their biology. To enable more sophisticated multidisciplinary study in this field, future investigations should focus on synthesizing novel complexes with enhanced bioavailability, solubility, and low toxicity. [ABSTRACT FROM AUTHOR]

The document is a contents list for the journal "Dalton Transactions: An International Journal of Inorganic Chemistry," published by The Royal Society of Chemistry. It includes various articles on topics such as NHC aluminum chemistry, catalytic functionalization of ferrocenes, and energetic coordination polymers. The journal covers a wide range of research on inorganic chemistry, showcasing recent advances and studies in the field. [Extracted from the article]

A panel of metal–betaine–bistriflimide complexes (with minimum formula M[Bet]2[Tf2N]2, where M = Mg, Ca, Zn, Cu and Ni) has been prepared in high purity and a quantitative yield. In parallel, a series of metal bistriflimide salts (sharing the same metal cations) has been synthesized and characterized though the same set of techniques. The current work presents a first comprehensive investigation of the physical–chemical properties of these two classes of metal systems, whose importance in a variety of applicative fields was not yet matched, to the best of our knowledge, by an adequate study of their characteristics. All the considered compounds have been spectroscopically, thermally and electrochemically characterized, and their solubility characteristics assessed, gaining insights into the role of metal cations in the definition of their properties. On the other hand, the evident effect of the betaine coordination on the prepared complexes' solubility, thermal stability, melting point, glass and solid–solid transitions, redox behaviour and electrochemical window was ascertained, providing results which would allow a more informed use and application of these classes of divalent metal complexes. [ABSTRACT FROM AUTHOR]

ABSTRACT The antimicrobial, antitumor and antioxidant potential of Co(II), Cu(II), Mn(II), Ni(II), Pd(II), and Pt(II) complexes with 2‐(((2‐chloro‐5‐(trifluoromethyl)phenyl)imino)methyl)phenol HL ligand was investigated. A molecular docking study was carried out to estimate the predicted binding affinity of the compounds to protein targets involved in proliferative and bacterial activities. Fluorescence quenching studies and synchronous spectra were used to examine the metal complexes interactions with CT‐DNA and BSA protein. The DNA binding study have revealed that the complexes are capable of binding with DNA via intercalative mode. The antimicrobial activity of the ligand and metal complexes was studied against three Gram‐positive bacteria, two Gram‐negative bacteria, and three strains of fungi. The best antibacterial effect was demonstrated by the Pt(II) complex on the Staphylococcus aureus strain, and as for the inhibitory effect on fungi, it was stronger on the Candida albicans strain after treatment with the Co(II) complex. The in vitro antiproliferative activity of ligand and complexes was analyzed using MTT, Annexin V/PI, and cell cycle assays. The in vitro results showed that, except for Pd(II) complex, where slight effects were observed, the MCF‐7 line was resistant to the activity of the complexes. In the case of A549 cells, Cu(II) and Pd(II) complexes showed a dose‐dependent antitumor activity, confirmed by both the Alamar blue and the Annexin V/PI analysis. Finally, the antioxidant activity of the compounds was examined by ABTS and DPPH methods. Antioxidant investigation showed that the Ni(II) complex possesses a remarkable ability to trap the cation of the ABTS+ radical (IC50 value 9.35 μM). [ABSTRACT FROM AUTHOR]

Homogeneous electrocatalysts typified by transition‐metal complex show transcendent potency in efficient energy catalysis through molecular design. For example, metal complexes with elaborate design performed wonderful activity and selectivity for electrocatalytic CO2 reduction. Primary coordination sphere of metal complexes plays a key role in regulating its intrinsic redox properties and catalytic activity. However, the overall reduction efficiency of CO2 is also bound up with the substrate activation process. Transition‐metal complexes are hoped to exhibit reasonable redox potential, reactive activity, and stability, while binding and activating CO2 molecules to achieve efficient CO2 reduction. Construction of second coordination sphere, especially hydrogen‐bonding network of transition‐metal complexes, is reported to be the “kill two birds with one stone” strategy to realize efficient CO2 reduction catalysis via systematic catalyst properties modulation and substrate activation. Herein, we present recent progress on the construction of hydrogen‐bonding network in the second coordination sphere of metal complexes by ligand modification or the introduction of exogenous organic ligand, and the resulted productive enhancement of the catalytic performance of metal complexes by the improvement of adsorption capacity and activation of CO2, proton transfer rate, and stability of reaction intermediates, and so forth. [ABSTRACT FROM AUTHOR]

ABSTRACT The interaction of 2,6‐pyridinedicarboxylicacid (PDA) and 2,2′‐bipyridyl (Bipy) with Co(II), Ni(II), and Cu(II) ions produced new ternary complexes [M (PDA)(Bipy)(H2O)] (M = Co(II), Ni(II), and Cu(II)), which were studied by elemental, spectral (FT‐IR, Mass, UV–Vis), and thermal analysis, and their interaction with Ct‐DNA was thoroughly studied using various methods, including absorption spectroscopy, fluorescence spectroscopy, and viscosity measurements. Spectrophotometric titration and viscosity measurements indicated that all the complexes bind to DNA via the groove mode of binding. The salt‐dependent binding of ternary metal complexes to Ct‐DNA has been studied by a UV–Vis spectrophotometric titration experiment. Furthermore, photocleavage studies were used to examine how the metal complexes interacted with the pBR322 DNA, and the results proved that these compounds have obvious photo cleavage properties. The biological effects were studied by antibacterial activity. [ABSTRACT FROM AUTHOR]

ABSTRACT The novel Schiff base, (Z)‐2‐(1‐((3‐methylpyridin‐2‐yl)imino)ethyl)phenol (HL), was synthesized by reacting 1‐(2‐hydroxyphenyl)ethanone with 3‐methylpyridin‐2‐amine. Metal complexes [M (L)n (H2O)2] (M = Co and Cu, n = 2) were synthesized and characterized utilizing various analytical techniques including UV–visible spectroscopy, FTIR, elemental analysis, molar conductance, 1H NMR, thermal analysis, and magnetic moment measurement. The findings indicated that the Co+2 and Cu+2 complexes exhibited octahedral geometries. In vitro biological activity testing was conducted to evaluate the antimicrobial potential of the complexes against Bacillus subtilis (B. subtilis) and Escherichia coli (E. coli) bacteria strains. Similarly, molecular docking was conducted to elucidate the interactions between the active sites of protein–metal complexes and dihydrofolate reductase as well as ferrochelatase. [ABSTRACT FROM AUTHOR]

ABSTRACT A novel heterocyclic thiosemicarbazide ligand, [(Z)‐N‐(2‐oxoindolin‐3‐ylidene)nicotinohydrazide] (H2L), and its Co(II), Cu(II), and Cd(II) metal chelates were synthesized and characterized using a variety of analytical methods, including elemental analysis, FT‐IR, UV–Visible spectroscopy, EI‐mass, fluorescence spectroscopy, X‐ray powder diffraction, and TGA. The structures and geometries of the complexes were determined using these methods as [Co2(H2L)2Cl2(H2O)4]·2H2O, [Cu(H2L)2Cl2(H2O)2]·2H2O, and [Cd(H2L)2Cl2(H2O)2], all having octahedral geometry. The particulate diameters for [Co2(H2L)2Cl2(H2O)4]·2H2O, [Cu(H2L)2Cl2(H2O)2]·2H2O, and [Cd(H2L)2Cl2(H2O)2] were 192.68, 68.48, and 192.74 nm, respectively using Debye–Scherrer equation and FWHM approach. The corresponding FWHM values were 0.0078, 0.0217, and 0.0075, whereas the crystal strain was calculated as (ε) = 0.0018, 0.0056, and 0.0054, and the dislocation density (δ) as 2.69 × 10−5, 2.13 × 10−4, 2.69 × 10−5 Å−2. Quantum chemical calculations for the ligand and its solid metal complexes were carried out utilizing DFT with the DMOL3 module. Furthermore, the optical sensing response of the free ligand H2L to Co(II), Cu(II), and Cd(II) ions was investigated, revealing that the presence of these metal ions enhanced the fluorescence spectra of the ligand. Additionally, the antibacterial effects of these compounds, as well as their cytotoxicity in human cancer cells, were investigated. Compared to its metal complexes, the ligand, H2L exhibits increased antibacterial activity against various bacteria. Tests on HepG‐2 and MCF‐7 cells were conducted to evaluate the compounds' anticancer efficacy against the standard, Doxorubicin. The ligand, H2L, demonstrated greater cytotoxicity against the HepG‐2 cell line than its metal complexes. Docking experiments were conducted to assess the interaction of the ligand and its complexes with HepG‐2 (PDB ID: 2OH4) and MCF‐7 (PDB ID: 3W2S) cells, using the XP glide technique and Schrödinger suite software. [ABSTRACT FROM AUTHOR]

The integration of mechanically interlocked molecules (MIMs) into polymeric materials has led to the development of mechanically interlocked polymers (MIPs). One class of MIPs that have gained attention in recent years are slide‐ring gels (SRGs), which are generally accessed by crosslinking rings on a main‐chain polyrotaxane. The mobility of the interlocked crosslinking moieties along the polymer backbone imparts enhanced properties onto these networks. An alternative synthetic approach to SRGs is to use a doubly threaded ring as the crosslinking moiety, yielding doubly threaded slide‐ring gel networks (dt‐SRGs). In this study, a photo‐curable ligand‐containing thread was used to assemble a series of metal‐templated pseudo[3]rotaxane crosslinkers that allow access to polymer networks that contain doubly threaded interlocked rings. The physicochemical and mechanical properties of these dt‐SRGs with varying size of the ring crosslinking moieties were investigated and compared to an entangled gel (EG) prepared by polymerizing the metal complex of the photo‐curable ligand‐containing thread, and a corresponding covalent gel (CG). Relative to the EG and CG, the dt‐SRGs exhibit enhanced swelling behavior, viscoelastic properties, and stress relaxation characteristics. In addition, the macroscopic properties of dt‐SRGs could be altered by "locking" ring mobility in the structure through remetalation, highlighting the impact of the mobility of the crosslinks. [ABSTRACT FROM AUTHOR]

The seminal isolation of a dinuclear rare earth metal complex comprising a bridging 2,2′-azobispyridyl radical anion, [(Cptet2Y)2(μ-abpy˙)](BPh4), is presented, which was obtained from a one-electron chemical oxidation of [(Cptet2Y)2(μ-abpy)]. The unprecedented compounds were characterized by crystallography, spectroscopy and DFT computations. The radical character was proven by EPR spectroscopy. [ABSTRACT FROM AUTHOR]

The symmetry of one of the simplest hexamonodentate complexes, [M(H2O)6]2+ (M = Fe, Co, Ni, and Zn), was controlled by tuning interactions in the second coordination sphere. Highly symmetric Ti–Mo or Zr–Mo cluster cations acted as symmetry templates, imposing a crystallographic trigonal coordination geometry in the hexamonodentate complexes through intermolecular hydrogen-bonding interactions. Magnetic measurements revealed that the ideal trigonal symmetry results in weak spin–orbit coupling for high-spin FeII complexes, despite the T-term ground state in the octahedral geometry. In contrast, high-spin CoII analogues with the T-term ground state exhibited strong spin–orbit coupling. DFT studies supported that a d6 FeII ion in the D3 symmetry has a 5A1 ground state while a d7 CoII in the same symmetry has a 4E ground state. Single-ion magnet behavior was observed in the CoII complexes. These results demonstrate that incorporating a diamagnetic, highly symmetric cluster enables precise symmetry control in single-ion magnets containing only monodentate ligands. [ABSTRACT FROM AUTHOR]

The synthesis of potassio-1H-silolides and -germolides substituted with an amidinate-stabilized silylene is reported. Both anions undergo a thermal rearrangement to the 2H-isomer yielding cyclic sila- and germavinyl anions. The reaction is driven by complex formation with metal ions. [ABSTRACT FROM AUTHOR]

A series of low-coordinate cationic 3d metal(I) complexes of the general formula [IPr·M(η6-tol)]+ is reported (M = Fe, Co, Ni; IPr = [(H)CN(Dip)C:]; Dip = 2,6-iPr2-C6H3), employing the weakly coordinating [BArF4]− counter-anion. The central metal in these complexes is stabilised solely by neutral carbene (i.e. IPr) and arene (i.e. toluene) ligands, making them rare examples of such cationic 3d metal(I) complexes, the electronic nature of which is explored by SQUID magnetometry. The utility of these species in [IPr·MI]+ transfer chemistry is demonstrated through the addition of a further equivalent of IPr, leading to formally two-coordinate cationic complexes, [(IPr2)·MI]+. [ABSTRACT FROM AUTHOR]

ABSTRACT This study reports the successful synthesis and characterization of five novel metal complexes (1–5) derived from the pyrrolopyrimidinehydrazide‐2‐chlorobenzaldehyde ligand, HPPHoCBA (L). The metal complexes demonstrated non‐electrolytic behavior and distinct geometries, as confirmed through comprehensive physicochemical analyses. Importantly, the synthesized complexes exhibited significantly enhanced antimicrobial, antioxidant, and cytotoxic activities compared to the ligand HPPHoCBA (L). Molecular docking studies revealed superior binding affinities of Pd(II) (1) and Cd(II) (4) complexes, which were further substantiated by pharmacophore modeling. Additionally, density functional theory (DFT) and molecular electrostatic potential (MEP) analyses provided insights into the stability and reactivity of these complexes, suggesting their potential in future therapeutic applications. These findings underscore the potential biomedical and industrial applications of the synthesized metal complexes. [ABSTRACT FROM AUTHOR]

Schiff bases are a class of synthetic compounds that form when primary amines combine with aldehydes or ketones. These compounds are incredibly important across various fields, such as biology, catalysis, and optics, due to their diverse features. One notable aspect is their ability to form complexes with transition metals, which opens up a wide range of potential uses, particularly in human systems. In the human body, Schiff base metal complexes display a range of biological actions, including antibacterial, antifungal, anticancer, and antimalarial properties. The versatility of Schiff bases in reacting with different transition metals gives these complexes intriguing potential for addressing biological issues and treating diseases. This article explores various examples of Schiff bases, metal complexes, and their associated ligands, highlighting their usefulness in a variety of biological applications. The potential of Schiff base metal complexes as valuable agents in resolving medical difficulties and advancing biomedical research is emphasized. [ABSTRACT FROM AUTHOR]

Ligand exchange processes at metal complexes underpin their reactivity and catalytic applications. While mechanisms of ligand exchange at single site complexes are well established, occurring through textbook associative, dissociative and interchange mechanisms, those involving heterometallic complexes are less well developed. Here we report the reactions of a well‐defined Fe−Al dihydride complex with exogenous ligands (CO and CNR, R=Me, tBu, Xyl=2,6‐Me2C6H3). Based on DFT calculations we suggest that these reactions occur through a dyotropic rearrangement, this involves initial coordination of the exogenous ligand at Al followed by migration to Fe, with simultaneous migration of a hydride ligand from Fe to Al. Such processes are rare for heterometallic complexes. We study the bonding and mechanism of the dyotropic rearrangement through in‐depth computational analysis (NBO, IBOs, CLMO analysis, QTAIM, NCIplot, IGMH), shedding new light on how the electronic structure of the heterometallic core responds to the migration of ligands between metal sites. The dyotropic rearrangement fundamentally changes the nature of the hydride ligands, exposing new nucleophilic reactivity as evidenced by insertion reactions with CO2, isocyanates, as well as isocyanides. [ABSTRACT FROM AUTHOR]

Flexible crystalline solids exhibit unique properties in response to external stimuli like heat and light. However, challenges exist in developing crystalline solids that have similar degrees of flexibility as in solution. Herein, we report the preparation of the new flexible crystalline metal complex [Cd(CF3SO3)2(4‐spy)4] (4‐spy=4‐styrylpyridine), which contains photoreactive 4‐spy ligand. Unlike traditional solids, this metal complex displays solution state‐like [2+2] photocycloaddition reactivity. Specifically, UV irradiation of the crystalline material leads to formation of the same diverse array of dimers and cis isomer that are generated by photoreaction in the solution state. In addition, the photoresponsive flexibility of the solid leads to a photosalient effect and photo‐induced formation of pores. The origin of the solution state‐like photoreactivity of the solid is related to properties of the Cd(II) cation and fluorinated CF3SO3 anion, and the multi‐orientational arrangement of the 4‐spy ligands. [ABSTRACT FROM AUTHOR]

The dinitrogen (N2) chemistry of lanthanides remains less developed compared to the d‐block metals and lanthanide‐promoted N2 functionalization chemistry in well‐defined lanthanide complexes remains elusive. Here we report the synthesis and characterization (SQUID, EPR, DFT, X‐Ray) of the siloxide supported heterobimetallic (Tm/K) complexes [{KTm(OSi(OtBu)3)3}2(μ‐η2 : η2‐N2)] (1) and [K3{Tm(OSi(OtBu)3)3}2(μ‐η2 : η2‐N2)] (2). Complex 2 provides a rare example of a metal complex of the triply reduced N23− radical. The structure of 2 differs from the few previously reported N23− complexes as it presents two Tm and three K cations binding the N23− radical, facilitating N2 functionalization. Notably, the K3Tm2‐bound N23− moiety reacts with excess H+ to form NH4Cl in 18 % yield, and with MeOTf at room temperature to yield the dimethyl hydrazido complex [K2{Tm(OSi(OtBu)3)3}2(μ‐(CH3)NN(CH3))] (3). Protonolysis of 3 yields MeHN−NMeH ⋅ 2HCl in 18 % yield. [ABSTRACT FROM AUTHOR]

Artificial metallo‐nucleases (AMNs) are small molecule DNA cleavage agents, also known as DNA molecular scissors, and represent an important class of chemotherapeutic with high clinical potential. This review provides a primary level of exploration on the concepts key to this area including an introduction to DNA structure, function, recognition, along with damage and repair mechanisms. Building on this foundation, we describe hybrid molecules where AMNs are covalently attached to directing groups that provide molecular scissors with enhanced or sequence specific DNA damaging capabilities. As this research field continues to evolve, understanding the applications of AMNs along with synthetic conjugation strategies can provide the basis for future innovations, particularly for designing new artificial gene editing systems. [ABSTRACT FROM AUTHOR]

ABSTRACT A new Schiff base ligand, HNMPC, was prepared and reacted with some metal ions, including Cu(II), Ni(II), Co(II), Mn(II), and VO(IV). The infrared, electronic, mass, electron spin resonance, nuclear magnetic resonance, thermal and elemental analysis, molar conductance, and magnetic susceptibility measurements were used to characterize the metal complexes. The HNMPC ligand acts as a monoanionic tridentate ONO donor in all complexes, and the coordinating sites are C=Opyridone, C=N, and the phenolate anion. All metal complexes exhibit octahedral configurations, and the results showed that the metal ion:ligand ratio was 1:2. The molecular structural parameters of the ligand and its metal complexes were determined based on the DFT level implemented in the Gaussian 09 program B3LYP/GENECP method at the 6‐311G(d,p) basis set for C, H, N, and O atoms and the SDD (Stuttgart/Dresden) basis set for the metal atoms. The theoretical data were correlated with the experimental results. Gram‐positive bacteria, Gram‐negative bacteria, yeast, and fungi were used to test the current compounds' antimicrobial activity. Investigating the antitumor activity of the ligand and its complexes against the HepG2 cell lines showed encouraging IC50 values that were on par with those of cisplatin. In order to determine the affinity and binding pattern for the synthesized compounds toward the VEGFR‐2 active site, molecular docking studies were conducted, and the results were correlated with antitumor data. Based on the obtained results, future work aimed to synthesize a new category of Schiff bases and their metal complexes derived from the current aminopyridine derivative with diverse aldehydes and ketones. [ABSTRACT FROM AUTHOR]

ABSTRACT Novel three metal complexes were synthesized starting from the selenated Schiff base 2‐(((4‐(benzylselanyl)phenyl)imino)methyl)‐5‐nitrophenol (BnSeOH) ligand. Elements, spectral data, magnetic moment, molar conductance, and thermal gravimetric investigations were used to confirm their structures, as well as X‐ray diffraction, IR, NMR, and MS spectroscopic techniques. Octahedral geometry was proposed for the Fe (III), Cu (II), and Zn (II) complexes. The anticancer and antimicrobial activities were assessed against various mammalian cells and pathogenic strains. Within this context, the Fe (III) complex and BnSeOH ligand were the most cytotoxic, and their toxicity was more pronounced in the case of HepG2 cells. Likewise, the Fe (III) complex and BnSeOH ligand showed good antimicrobial activity against Candida Albicans, Bacillus subtilis, and Pseudomonas aeruginosa pathogens. Furthermore, the antioxidant properties were also estimated using DPPH and SOD bioassays. Computational analysis revealed the ligand exhibits lower reactivity relative to its metal complexes based on the ΔE gap and η values representing energy gap and hardness. The parameters examined in this study provide valuable insight into the bonding, electronic properties, reactivity, and polarity of the compounds under investigation. The pharmacological and computational findings point to promising activities of complexes. [ABSTRACT FROM AUTHOR]

A bulky, unsymmetrical β-diketiminate ligand, [HC{MeCN(Dip)}{MeCN(TCHP)}]− (Dip/TCHPNacnac; Dip = 2,6-diisopropylphenyl, TCHP = 2,4,6-tricyclohexylphenyl), has been utilised in the preparation of a series of magnesium alkyl and calcium, strontium and barium amide complexes. Reaction of these with PhSiH3 afforded the first complete series of β-diketiminato heavier group 2 metal hydride complexes, [{(Dip/TCHPNacnac)M(μ-H)}2] (M = Mg, Ca, Sr or Ba). The unsymmetrical nature of the β-diketiminate ligand seemingly promotes stabilising interactions of ligand Dip groups with the metal centres in the Ca, Sr and Ba hydride complexes. [ABSTRACT FROM AUTHOR]