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The title coordination polymer with the 4-methyl-N-(pyridin-2-yl­methyl­idene)aniline Schiff base ligand (L, C13H12N2), [Cd2Cl4(C13H12N2)]n (1), exhibits a columnar structure extending parallel to [100]. The columns are aligned in parallel and are decorated with chelating L ligands on both sides. They are elongated into a supra­molecular sheet extending parallel to (01⥘) through π–π stacking inter­actions involving L ligands of neighbouring columns. Adjacent sheets are packed into the tri-periodic supra­molecular network through weak C—H⋯Cl hydrogen-bonding inter­actions that involve the phenyl CH groups and chlorido ligands. The thermal stability and photoluminescent properties of (1) have also been examined. [ABSTRACT FROM AUTHOR]

The title coordination polymer with the 4-methyl-N-(pyridin-2-yl-methyl-idene)aniline Schiff base ligand (L, C13H12N2), [Cd2Cl4(C13H12N2)] n (1), exhibits a columnar structure extending parallel to [100]. The columns are aligned in parallel and are decorated with chelating L ligands on both sides. They are elongated into a supra-molecular sheet extending parallel to (01) through π-π stacking inter-actions involving L ligands of neighbouring columns. Adjacent sheets are packed into the tri-periodic supra-molecular network through weak C-H⋯Cl hydrogen-bonding inter-actions that involve the phenyl CH groups and chlorido ligands. The thermal stability and photoluminescent properties of (1) have also been examined. [ABSTRACT FROM AUTHOR]

In the title lanthanide(III) compound, [Tb(NO3)2(C2H6N2O)3]NO3, the asym­metric unit contains one Tb3+ ion, three acetohydrazide (C2H6N2O) ligands, two coordinated nitrate anions, and an isolated nitrate anion. The Tb3+ ion is in a ninefold coordinated distorted tricapped trigonal–prismatic geometry formed by three oxygen atoms and three nitro­gen atoms from three different acetohydrazide ligands and three oxygen atoms from two nitrate anions. In the crystal, the complex mol­ecules and the non-coordinated nitrate anions are assembled into a three-dimensional supra­molecular architecture through extensive N—HO hydrogen-bonding inter­actions between the amine NH groups of the acetohydrazide ligands and the nitrate oxygen atoms. Hirshfeld surface analysis was performed to aid in the visualization of inter­mol­ecular contacts. [ABSTRACT FROM AUTHOR]

Four isostructural dinuclear M2L2 mesocates of the general formula [M2(NCS)4(L)2]·4.5MeOH (1M; M = Mn, Fe, Co, Zn) were constructed by using the coordination-driven self-assembly of the [M(NCS)2] precursor and the flexible bis-bidentate pyridylimine Schiff base ligand L (L = 4,4′-(1,4-phenylenebis(oxy))bis(N-(pyridin-2-ylmethylene)aniline). The centrosymmetric M2L2 mesocate forms through the side-by-side coordination of two L ligands to a pair of M(II) ions. The mesocates exhibit a reversible temperature induced desolvation–solvation behavior without losing their structural integrity. The activated 1Co, as the representative M2L2 mesocate, shows an exceptionally high MeOH vapour uptake capacity of 481.9 cm3 g−1 (68.8 wt%) at STP with good recyclability. Notably, it also exhibits CO2 adsorption with an uptake capacity of 20.2 cm3 g−1 (3.6 wt%) at room temperature and 1 bar. [ABSTRACT FROM AUTHOR]

The first benzohydrazide complex of a lanthanide is reported. In the title compound, [Sm(C8H4O4)(C7H8N2O)3(H2O)2]NO3, systematic name diaquatris( benzohydrazide-κ²N,O)(isophthalato-κO)samarium(III) nitrate, the SmIII ion is nine-coordinated in a distorted tricapped trigonal–prismatic geometry by three oxygen atoms and three nitrogen atoms from three benzhydrazide (bzz) ligands, one oxygen atom from the isophthalate (itp2-) ligand, and two oxygen atoms from coordinated water molecules. The nitrate group is disordered over two sets of sites with occupancy factors of 0.310 (17) and 0.690 (17). In the crystal, adjacent molecules are linked into chains via pairs of O—H···O and N—H···O hydrogen bonds between the carboxylate acceptor and the coordinated water and amine NH2 donors. Molecules are further stacked by π-π interactions involving the benzene ring of the itp2- ligands, forming double chains that extend in the b-axis direction. These double chains are further linked into a three-dimensional supramolecular network via hydrogen bonds (O— H···O, N—H···O and C—H···O) between the complex molecule and the nitrate groups along with C—H···π and π-π interactions involving the benzene rings of the bzz and itp2- ligands. [ABSTRACT FROM AUTHOR]

Two new lanthanide-based coordination polymers, [Sm2(bzz)(ben)6(H2O)3]·0.5H2O (1) and [Eu(bbz)(ben)3] (2), were synthesized and characterized. The described products were formed from in situ-generated benzoate (ben) and N'-benzoylbenzohydrazide (bbz) ligands, which were the products of transformation of originally added benzhydrazide (bzz) under hydrothermal conditions. Compound 1 exhibits a one-dimensional (1D) double-chain structure built up from the connection of the central Sm3+ ions with a mixture of bzz and ben ligands. On the other hand, 2 features a 3D network with a 4-connected (66) dia topology constructed from dinuclear [Eu2(ben)6] secondary building units and bbz linkers. High-pressure CO2 sorption studies of activated 1 show that maximum uptake increases to exceptionally high values of 376.7 cm3 g−1 (42.5 wt%) under a pressure of 50 bar at 298 K with good recyclability. Meanwhile, 2 shows a typical red emission in the solid state at room temperature with the decay lifetime of 1.2 ms. [ABSTRACT FROM AUTHOR]

Crystals CdSO4(H2O) are hydrothermally grown from an aqueous solution of equimolar amounts of CdSO4·8/3H2O and 3,6-di-2-pyridyl-1,2,4,5-tetrazine (autoclave, 356 K, 5 d). [ABSTRACT FROM AUTHOR]

A highly regioselective divergent approach is reported for the synthesis of both indeno[2,1- c ]pyran-3-one and 1-oxazolonylisobenzofuran derivatives using the Erlenmeyer-Plöchl azlactone (EPA) reaction. This approach involves the synthesis of o -(2-acyl-1-ethynyl)benzaldehydes, which reacted with various amino acids. Reaction with N -acylglycines resulted in the formation of indeno[2,1- c ]pyran-3-ones, involving the sequential formation of two C-C bonds and two C-O bonds. Conversely, when the same conditions were applied to free amino acids, 1-oxazolonylisobenzofurans were obtained. This reaction involved the formation of a C-C bond between oxazolone and o -(2-acyl-1-ethynyl)benzaldehyde, followed by the formation of a C-O bond through a selective 5 -exo-dig cyclization., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)

Four isostructural dinuclear M2L2 mesocates of the general formula [M2(NCS)4(L)2]·4.5MeOH (1M; M = Mn, Fe, Co, Zn) were constructed by using the coordination-driven self-assembly of the [M(NCS)2] precursor and the flexible bis-bidentate pyridylimine Schiff base ligand L (L = 4,4'-(1,4-phenylenebis(oxy))bis(N-(pyridin-2-ylmethylene)aniline). The centrosymmetric M2L2 mesocate forms through the side-by-side coordination of two L ligands to a pair of M(ii) ions. The mesocates exhibit a reversible temperature induced desolvation-solvation behavior without losing their structural integrity. The activated 1Co, as the representative M2L2 mesocate, shows an exceptionally high MeOH vapour uptake capacity of 481.9 cm3 g-1 (68.8 wt%) at STP with good recyclability. Notably, it also exhibits CO2 adsorption with an uptake capacity of 20.2 cm3 g-1 (3.6 wt%) at room temperature and 1 bar.

Two new mononuclear metal complexes involving the bidentate Schiff base ligand 2,4,6-trimethyl- N -[(pyridin-2-yl)methyl-idene]aniline (C 15 H 16 N 2 or PM-TMA), [Mn(NCS) 2 (PM-TMA) 2 ] ( I ) and [Ni(NCS) 2 (PM-TMA) 2 ] ( II ), were synthesized and their structures determined by single-crystal X-ray diffraction. Although the title compounds crystallize in different crystal systems [triclinic for ( I ) and monoclinic for ( II )], both asymmetric units consist of one-half of the complex mol-ecule, i.e. one metal(II) cation, one PM-TMA ligand, and one N-bound thio-cyanate anion. In both complexes, the metal(II) cation is located on a centre of inversion and adopts a distorted octa-hedral coordination environment defined by four N atoms from two symmetry-related PM-TMA ligands in the equatorial plane and two N atoms from two symmetry-related NCS - anions in a trans axial arrangement. The tri-methyl-benzene and pyridine rings of the PM-TMA ligand are oriented at dihedral angles of 74.18 (7) and 77.70 (12)° for ( I ) and ( II ), respectively. The subtle change in size of the central metal cations leads to a different crystal packing arrangement for ( I ) and ( II ) that is dominated by weak C-H⋯S, C-H⋯π, and π-π inter-actions. Hirshfeld surface analysis and two-dimensional fingerprint plots were used to qu-antify these inter-molecular contacts, and indicate that the most significant contacts in packing are H⋯H [48.1% for ( I ) and 54.9% for ( II )], followed by H⋯C/C⋯H [24.1% for ( I ) and 15.7% for ( II )], and H⋯S/S⋯H [21.1% for ( I ) and 21.1% for ( II )]., (© Jittirattanakun et al. 2020.)

The title compound, C 8 H 4 Br 2 O 4 ·C 2 H 6 O 2 , crystallizes with one-half of a 2,5-di-bromo-terephthalic acid (H 2 Br 2 tp) mol-ecule and one-half of an ethyl-ene glycol (EG) mol-ecule in the the asymmetric unit. The whole mol-ecules are generated by application of inversion symmetry. The H 2 Br 2 tp mol-ecule is not planar, with the di-bromo-benzene ring system inclined by a dihedral angle of 18.62 (3)° to the carb-oxy-lic group. In the crystal, the H 2 Br 2 tp and EG mol-ecules are linked into sheets propagating parallel to (01) through O-H⋯O hydrogen bonds, thereby forming R 4 4 (12) and R 4 4 (28) graph-set motifs. Br⋯O and weak π-π stacking inter-actions are also observed. Hirshfeld surface analysis was used to confirm the existence of these inter-actions.

The title compound, [Ag2Mn(CN)4(C10H8N2)] n or Mn(bipy){Ag(CN)2}2 (bipy = 2,2'-bi-pyridine) is isostructural with Cd(bipy){Au(CN)2}2 [Guo et al. (2009 ▸). CrystEngComm, 11, 61-66]. The Mn(II) atom has crystallographically imposed twofold symmetry and a distorted octa-hedral coordination sphere consisting of six N atoms from one bi-pyridine ligand and four di-cyano-argentate(I) anions, [Ag(CN)2](-), while the Ag(I) atom of the complex anion displays the expected linear geometry. Each [Ag(CN)2](-) unit connects to two neighbouring [Mn(bipy)](2+) cations to give an threefold inter-penetrating quartz-like three-dimensional framework. No directional inter-actions beyond van der Waals contacts are observed.

The asymmetric unit of the title complex, [Ni(C₁₀H₈N₂)(H₂O)₄]SO₄, consists of a complex [Ni(bipy)(H₂O)₄]²⁺ cation (bipy = 2,2'-bipyridine) and a non-coordinating [SO₄]²⁻ anion. The Ni(II) atom is six-coordinated in a distorted octa-hedral geometry defined by the two N atoms of the bipy ligand and four water O atoms. The crystal structure contains extensive classical O-H⋯O hydrogen bonds, which link the ions into a two-dimensional array in the ab plane. Layers are connected into a three-dimensional supra-molecular structure by C-H⋯O inter-actions.