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One chiral heterotrimetallic compound, [Cu(H2O){(R,R)‐valcy}Tb(CH3OH)2(H2O)(μ‐CN)Fe(CN)5]·[Cu(H2O){(R,R)‐valcy}Tb(CH3OH)1.5(H2O)1.5(μ‐CN)Fe(CN)5]·7.85H2O·2CH3OH (1) (H2(R,R)‐valcy = N,N′‐bis(3‐methoxysalicylidene)‐1R,2R‐1,2‐diaminocyclohexane), has been prepared and structurally characterized by X‐ray single‐crystal diffraction. In 1, the asymmetric trinuclear {CuIITbIIIFeIII} units are assembled into 1‐D supramolecular single chain by hydrogen‐bonds and the supramolecular chains are further connected into 2D sheets. Magnetic studies show overall weak ferromagnetic interaction and magnetic anisotropy. The enantiomer of 1, denoted as complex 2, derived from N,N′‐bis(3‐methoxysalicylidene)‐1S,2S‐1,2‐diaminocyclohexane was also synthesized and characterized by PXRD, Infrared spectra, CD spectra, and fluorescence spectra. The results indicated that complexes 1 and 2 are isomorphous exhibiting similar fluorescence properties. [ABSTRACT FROM AUTHOR]

Crystal structure of [diaqua[2,2'-(1,2-phenylene)bis(1H-imidazole-4-carboxylato-5-carboxy)- 4N,N',O,O']nickel(II)] tetrahydrate, C16H12N4NiO10-4H2O There are O-H---O intramolecular hydrogen bonds between carboxyl and carboxylate groups, N-H---O intermolecular hydrogen bonds between imidazole units and solvent water molecules and O-H---O intermolecular hydrogen bonds involving coordination water molecules, solvent water molecules and carboxylate groups. Each Ni1 ion is six-coordinated and located in a distorted octahedral NiN SB 2 sb O SB 4 sb coordination environment formed by two N atoms (N1 and N1#1) and two O atoms (O1 and O1#1) from one H SB 4 sb Phbidc SP 2- sp anion and by two water molecules (O5 and O6). [Extracted from the article]

A new Cd(II) complex, [Cd(H4pbidc)(H2O)] n (1), incorporating 2,2′-(propane-1,3-diyl)bis(1H- imidazole-4,5-dicarboxylic acid) (H6pbidc) was synthesized and characterized by elemental analysis, infrared spectra and X-ray single-crystal diffraction. In complex 1, each Cd(II) ion is hepta-coordinated, showing a significantly distorted pentagonal-bipyramidal coordination environment. Adjacent Cd(II) ions are alternately joined through two carboxylate oxygen atoms and two bridging water molecules resulting in a one-dimensional chain structure. In the solid state, adjacent chains are further linked by hydrogen bonds, forming a three-dimensional supramolecular architecture. Meanwhile, the interactions of complex 1 with bovine serum albumin were analysed by fluorescence measurements under physiological conditions. The results indicated that the fluorescence intensity of bovine serum albumin was decreased considerably upon the addition of complex 1 through a static quenching mechanism with formation of one binding site. The negative values of the thermodynamic parameters including enthalpy change (Δ H), entropy change (Δ S) and Gibbs free energy change (Δ G) showed that hydrogen bonding and van der Waals forces were the main interactions in the binding of complex 1 to bovine serum albumin, and the binding process is spontaneous in thermodynamics. [ABSTRACT FROM AUTHOR]

Changing the pH value of a reaction system can result in polymers with very different compositions and architectures. Two new coordination polymers based on 1,1′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium) (L2−), namely catena‐poly[[[tetraaquacadmium(II)]‐μ2‐1,1′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium)] 1.66‐hydrate], {[Cd(C22H14N2O8)(H2O)4]·1.66H2O}n, (I), and poly[{μ6‐1,1′‐[1,4‐phenylenebis(methylene)]bis(3,5‐dicarboxylatopyridinium)}cadmium(II)], [Cd(C22H14N2O8)]n, (II), have been prepared in the presence of NaOH or HNO3 and structurally characterized by single‐crystal X‐ray diffraction. In polymer (I), each CdII ion is coordinated by two halves of independent L2− ligands, forming a one‐dimensional chain structure. In the crystal, these chains are further connected through O—H...O hydrogen bonds, leading to a three‐dimensional hydrogen‐bonded network. In polymer (II), each hexadentate L2− ligand coordinates to six CdII ions, resulting in a three‐dimensional network structure, in which all of the CdII ions and L2− ligands are equivalent, respectively. The IR spectra, thermogravimetric analyses and fluorescence properties of both reported compounds were investigated. [ABSTRACT FROM AUTHOR]

Aminobenzoic acid derivatives are widely used in the preparation of new coordination polymers since they contain O‐atom donors, as well as N‐atom donors, and have a rich variety of coordination modes which can lead to polymers with intriguing structures and interesting properties. Two new coordination polymers incorporating 1‐aminobenzene‐3,4,5‐tricarboxylic acid (H3abtc), namely, poly[(μ3‐1‐amino‐5‐carboxybenzene‐3,4‐dicarboxylato)diaquacadmium(II)], [Cd(C9H5NO6)(H2O)2]n, (I), and poly[[bis(μ5‐1‐aminobenzene‐3,4,5‐tricarboxylato)triaquatrizinc(II)] dihydrate], {[Zn3(C9H4NO6)2(H2O)3]·2H2O}n, (II), have been prepared and structurally characterized by single‐crystal X‐ray diffraction. In polymer (I), each tridentate 1‐amino‐5‐carboxybenzene‐3,4‐dicarboxylate (Habtc2−) ligand coordinates to three CdII ions to form a two‐dimensional network structure, in which all of the CdII ions and Habtc2− ligands are equivalent, respectively. Polymer (II) also exhibits a two‐dimensional network structure, in which three crystallographically independent ZnII ions are bridged by two crystallographically independent pentadentate 1‐aminobenzene‐3,4,5‐tricarboxylate (abtc3−) ligands. This indicates that changing the metal ion can influence the coordination mode of the H3abtc‐derived ligand and further influence the detailed architecture of the polymer. Moreover, the IR spectra, thermogravimetric analyses and fluorescence properties were investigated. [ABSTRACT FROM AUTHOR]

Compared with the monomorphic type of ligand, combining mixed ligands in one coordination polymer offers greater tunability of the structural framework. Employment of N‐heterocyclic ligands and aromatic polycarboxylates is an effective approach for the construction of metal–organic frameworks (MOFs). Two new coordination polymers incorporating both 2‐[(1H‐imidazol‐1‐yl)methyl]‐1H‐benzimidazole (imb) and benzenedicarboxylic acid isomers, namely, catena‐poly[[[di‐μ‐chlorido‐bis[(2‐carboxybenzoato‐κ2O1,O1′)cadmium(II)]]‐bis{μ‐2‐[(1H‐imidazol‐1‐yl)methyl]‐1H‐benzimidazole‐κ2N:N′}] dihydrate], {[Cd(C8H5O4)Cl(C11H10N4)]·H2O}n, (I), and poly[[aqua(μ2‐benzene‐1,3‐dicarboxylato‐κ3O1,O1′:O3){μ2‐2‐[(1H‐imidazol‐1‐yl)methyl]‐1H‐benzimidazole‐κ2N:N′}cadmium(II)] dihydrate], {[Cd(C8H4O4)(C11H10N4)(H2O)]·2H2O}n, (II), have been prepared and structurally characterized by single‐crystal X‐ray diffraction. In polymer (I), imb ligands bridge CdII ions, forming a one‐dimensional chain, and 2‐carboxybenzoate anions coordinate to the CdII ions in a terminal fashion. Polymer (II) exhibits a two‐dimensional network structure in which imb ligands and the benzene‐1,3‐dicarboxylate anions join CdII ions co‐operatively. This indicates that changing of the aromatic dicarboxylic acids can result in polymers with different compositions and architectures. Moreover, their IR spectra, PXRD (powder X‐ray diffraction) patterns, thermogravimetric analyses and fluorescence properties were also investigated. [ABSTRACT FROM AUTHOR]

In recent years, N‐heterocyclic carboxylate ligands have attracted much interest in the preparation of new coordination polymers since they contain N‐atom donors, as well as O‐atom donors, and have a rich variety of coordination modes which can lead to polymers with intriguing structures and interesting properties. A new two‐dimensional coordination polymer, namely poly[[μ3‐2,2′‐(1,2‐phenylene)bis(4‐carboxy‐1H‐imidazole‐5‐carboxylato)‐κ6O4,N3,N3′,O4′:O5:O5′]manganese(II)], [Mn(C16H8N4O8)]n or [Mn(H4Phbidc)]n, has been synthesized by the reaction of Mn(OAc)2·4H2O (OAc is acetate) with 2,2′‐(1,2‐phenylene)bis(1H‐imidazole‐4,5‐dicarboxylic acid) (H6Phbidc) under solvothermal conditions. In the polymer, each MnII ion is six‐coordinated by two N atoms from one H4Phbidc2− ligand and by four O atoms from three H4Phbidc2− ligands, forming a significantly distorted octahedral MnN2O4 coordination geometry. The MnII ions are linked by hexadentate H4Phbidc2− ligands, leading to a two‐dimensional structure parallel to the ac plane. In the crystal, adjacent layers are further connected by N—H…O hydrogen bonds, forming a three‐dimensional structure in the solid state. [ABSTRACT FROM AUTHOR]

Careful choice of the organic ligands is one of the most important parameters in the rational design and synthesis of coordination polymers. Aromatic polycarboxylates have been widely used in the preparation of metal-organic polymers since they can utilize various coordination modes to form diverse structures and can act as hydrogen-bond acceptors and donors in the assembly of supramolecular structures. Nitrogen-heterocyclic organic compounds have also been used extensively as ligands for the construction of polymers with interesting structures. In the polymers catena-poly[[[diaquabis{2-[(1 H-imidazol-1-yl)methyl]-6-methyl-1 H-benzimidazole-κ N3}cobalt(II)]-μ2-benzene-1,4-dicarboxylato-κ2 O1: O4] dihydrate], {[Co(C8H4O4)(C12H11N4)2(H2O)2]·2H2O} n, (I), and catena-poly[[[diaquabis{2-[(1 H-imidazol-1-yl)methyl]-6-methyl-1 H-benzimidazole-κ N3}nickel(II)]-μ2-benzene-1,4-dicarboxylato-κ2 O1: O4] dihydrate], {[Ni(C8H4O4)(C12H11N4)2(H2O)2]·2H2O} n, (II), the CoII or NiII ion lies on an inversion centre and exhibits a slightly distorted octahedral coordination geometry, coordinated by two N atoms from two imidazole rings and four O atoms from two monodentate carboxylate groups and two water molecules. The dicarboxylate ligands bridge metal ions forming a polymeric chain. The 2-[(1 H-imidazol-1-yl)methyl]-6-methyl-1 H-benzimidazole ligands coordinate to the CoII or NiII centres in monodentate modes through an imidazole N atom and are pendant on opposite sides of the main chain. The two structures are isomorphous. In the crystal, the one-dimensional chains are further connected through O-H...O, O-H...N and N-H...O hydrogen bonds, leading to a three-dimensional supramolecular architecture. In addition, the IR spectroscopic properties, PXRD patterns, thermogravimetric behaviours and fluorescence properties of both polymers have been investigated. [ABSTRACT FROM AUTHOR]

A copper(II) complex chlorido-{1-carboxylic acid ethyl ester-4, 7-bis[1-(carboxylic acid ethyl ester) benzimidazole-2-yl-methyl]-1,4,7-triazacyclononane}copper(II) hexafluorophosphate ethanol solvate ([CuClL]·PF6·EtOH) was synthesized and crystallographically characterized {where L = 1-carboxylic acid ethyl ester-4,7-bis[1-(carboxylic acid ethyl ester) benzimidazole-2-yl-methyl]-1,4,7-triazacyclononane}. X-ray structure analysis shows that the copper(II) adopts a distorted square pyramidal coordination geometry. The activity of dismutation of superoxide () of the complex in riboflavin–methionine–nitroblue tetrazolium was studied. The result shows that the complex possesses a high superoxide dismutase (SOD) activity in comparison to some reported SOD mimics. Its redox behavior was studied by cyclic voltammetry with the aim of elucidating the reason that the complex reduces superoxide radicals. [ABSTRACT FROM AUTHOR]

The unsymmetrical N-heterocyclic ligand 1-[(benzotriazol-1-yl)methyl]-1 H-1,3-imidazole (bmi) has three potential N-atom donors and can act in monodentate or bridging coordination modes in the construction of complexes. In addition, the bmi ligand can adopt different coordination conformations, resulting in complexes with different structures due to the presence of the flexible methylene spacer. Two new complexes, namely bis{1-[(benzotriazol-1-yl)methyl]-1 H-1,3-imidazole-κ N3}dibromidomercury(II), [HgBr2(C10H9N5)2], and bis{1-[(benzotriazol-1-yl)methyl]-1 H-1,3-imidazole-κ N3}diiodidomercury(II), [HgI2(C10H9N5)2], have been synthesized through the self-assembly of bmi with HgBr2 or HgI2. Single-crystal X-ray diffraction shows that both complexes are mononuclear structures, in which the bmi ligands coordinate to the HgII ions in monodentate modes. In the solid state, both complexes display three-dimensional networks formed by a combination of hydrogen bonds and π-π interactions. The IR spectra and PXRD patterns of both complexes have also been recorded. [ABSTRACT FROM AUTHOR]

We have specified the synthetic conditions to obtain one-directionally ordered CaSi2 microwall arrays vertically grown on a Si substrate. Our basic concept is based on the utilization of the Kirkendall effect for reactive deposition epitaxy (RDE). We found for the first time that: 1) a much larger Ca vapor supply on the Si substrate than the conventional RDE, 2) the adoption of a two-step heating process, and 3) the selection of the crystal axis of the Si surface are the keys to control the microstructures of CaSi2 on the Si substrate. The CaSi phase was first formed on Si, then the CaSi2 phase was formed at the CaSi/Si interface. Based on the Kirkendall effect, the interdiffusion of Ca and Si was enhanced in the vertical direction rather than in the parallel direction to the Si surface. CaSi2 tends to grow along four equivalent Si{111} planes, however, the specific orientation of the Si surface resulted in CaSi2 microwalls grown along its Si(11 [ABSTRACT FROM AUTHOR]

Two coordination polymers, [Cd(sbdc)(bmib)]n(1) and {[Zn(sbdc)(tib)]·0.5H2O}n(2) (H2sbdc = 4,4′-stilbenedicarboxylic, bmib = 1,4-bis(2-methylimidazol-1-yl)butane, tib = 1,3,5-tris(1-imidazolyl)benzene), have been synthesized under solvothermal conditions, characterized by elemental analysis, infrared spectra, thermogravimetric analysis, and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that1and2show 8-fold and 2-fold interpenetrating 3-D frameworks, respectively. Complexes1and2display a 4-connected (66)sqc6and a 4-connected (44·62)sqltopology, respectively. Photoluminescent and thermal properties of1and2have also been investigated. [ABSTRACT FROM AUTHOR]

Three new Cd(II) complexes incorporating both 2-(1H-imidazol-1-methyl)-1H-benzimidazole (imb) and 1,4-benzenedicarboxylate (bdic2−), [CdCl(bdic)1/2(imb)2]n(1), {[Cd(bdic)(imb)(H2O)]·DMF·2H2O}n(2), and [Cd(bdic)(imb)]·3H2O}n(3), have been prepared and structurally characterized by single crystal X-ray diffraction. Bdic2−anions connect the⋯Cd-imb-Cd-imb⋯chains leading to a 2-D structure of1. Bdic2−(A) and bdic2−(B) anions link the binuclear [Cd2(imb)2(H2O)2] units forming a 2-D structure of2. Complex3features a 2-D structure involving supramolecular “double-layer” motifs. IR spectra and thermogravimetric curves are consistent with the results of the X-ray crystal structure analysis;1–3exhibit good fluorescence in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

The synthesis of coordination polymers or metal-organic frameworks (MOFs) has attracted considerable interest owing to the interesting structures and potential applications of these compounds. It is still a challenge to predict the exact structures and compositions of the final products. A new one-dimensional coordination polymer, catena-poly[[[bis{1-[(1 H-benzimidazol-2-yl)methyl]-1 H-tetrazole-κ N3}zinc(II)]-μ-hexane-1,6-dicarboxylato-κ4 O1, O1′: O6, O6′] monohydrate], {[Zn(C6H8O4)(C9H8N6)2]·H2O} n, has been synthesized by the reaction of Zn(Ac)2 (Ac is acetate) with 1-[(1 H-benzimidazol-2-yl)methyl]-1 H-tetrazole (bimt) and adipic acid (H2adi) at room temperature. In the polymer, each ZnII ion exhibits an irregular octahedral ZnN2O4 coordination geometry and is coordinated by two N atoms from two symmetry-related bimt ligands and four O atoms from two symmetry-related dianionic adipate ligands. ZnII ions are connected by adipate ligands into a one-dimensional chain which runs parallel to the c axis. The bimt ligands coordinate to the ZnII ions in a monodentate mode on both sides of the main chain. In the crystal, the one-dimensional chains are further connected through N-H...O hydrogen bonds, leading to a three-dimensional supramolecular architecture. In addition, the title polymer exhibits fluorescence, with emissions at 334 and 350 nm in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

Due to their strong coordination ability and the diversities of their coordination modes, N-heterocyclic organic compounds are used extensively as ligands for the construction of complexes with fascinating structures and potential applications in many fields. Two new complexes, namely bis{1-[(benzotriazol-1-yl)methyl]-1 H-imidazole-κ N3}dibromidozinc(II), [ZnBr2(C10H9N5)2], (I), and bis{1-[(benzotriazol-1-yl)methyl]-1 H-imidazole-κ N3}diiodidozinc(II), [ZnI2(C10H9N5)2], (II), have been synthesized by reaction of the unsymmetrical N-heterocyclic ligand 1-[(benzotriazol-1-yl)methyl]-1 H-imidazole (bmi) with Zn(acetate)2 in the presence of KBr or KI. Single-crystal X-ray diffraction analysis shows that both complexes exhibit a mononuclear structure, in which the bmi ligands coordinate to the central metal ion in a monodentate mode. In the solid state, both complexes possess a three-dimensional network formed by hydrogen bonds and π-π interactions. In addition, the IR spectroscopic properties, PXRD patterns and fluorescence properties of both complexes have been investigated. [ABSTRACT FROM AUTHOR]

C17H21N4O5.5Zn, monoclinic, P21/c (no. 14), a = 9.4009(12) Å, b = 13.8160(18) Å, c = 15.1299(19) Å, β = 95.507(3)°, V = 1956.0(4) Å3, Z = 4, Rgt(F) = 0.0590, wRref(F2) = 0.1495, T = 298(2) K. [ABSTRACT FROM AUTHOR]

Vertical and in-plane heterostructures based on van der Waals (vdW) crystals have drawn rapidly increasing attention owning to the extraordinary properties and significant application potential. However, current heterostructures are mainly limited to vdW crystals with a symmetrical hexagonal lattice, and the heterostructures made by asymmetric vdW crystals are rarely investigated at the moment. In this contribution, it is reported for the first time the synthesis of layered orthorhombic SnS-SnS xSe(1− x) core-shell heterostructures with well-defined geometry via a two-step thermal evaporation method. Structural characterization reveals that the heterostructures of SnS-SnS xSe(1− x) are in-plane interconnected and vertically stacked, constructed by SnS xSe(1− x) shell heteroepitaxially growing on/around the pre-synthesized SnS flake with an epitaxial relationship of (303)SnS//(033)SnS xSe(1− x), [010]SnS//[100]SnS xSe(1− x). On the basis of detailed morphology, structure and composition characterizations, a growth mechanism involving heteroepitaxial growth, atomic diffusion, as well as thermal thinning is proposed to illustrate the formation process of the heterostructures. In addition, a strong polarization-dependent photoresponse is found on the device fabricated using the as-prepared SnS−SnS xSe(1− x) core-shell heterostructure, enabling the potential use of the heterostructures as functional components for optoelectronic devices featured with anisotropy. [ABSTRACT FROM AUTHOR]

The N-heterocyclic ligand 2-[(1 H-imidazol-1-yl)methyl]-1 H-benzimidazole (imb) has a rich variety of coordination modes and can lead to polymers with intriguing structures and interesting properties. In the coordination polymer catena-poly[[cadmium(II)-bis[μ-benzene-1,2-dicarboxylato-κ4 O1, O1′: O2, O2′]-cadmium(II)-bis{μ-2-[(1 H-imidazol-1-yl)methyl]-1 H-benzimidazole}-κ2 N2: N3;κ2 N3: N2] dimethylformamide disolvate], {[Cd(C8H4O4)(C11H10N4)]·C3H7NO} n, (I), each CdII ion exhibits an irregular octahedral CdO4N2 coordination geometry and is coordinated by four O atoms from two symmetry-related benzene-1,2-dicarboxylate (1,2-bdic2−) ligands and two N atoms from two symmetry-related imb ligands. Two CdII ions are connected by two benzene-1,2-dicarboxylate ligands to generate a binuclear [Cd2(1,2-bdic)2] unit. The binuclear units are further connected into a one-dimensional chain by pairs of bridging imb ligands. These one-dimensional chains are further connected through N-H...O hydrogen bonds and π-π interactions, leading to a two-dimensional layered structure. The dimethylformamide solvent molecules are organized in dimeric pairs via weak interactions. In addition, the title polymer exhibits good fluorescence properties in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

Three Co(II) coordination polymers based on flexible bis(2-dimethylbenzimidazole) and the derivatives of the familiar isophthalate co-ligands, namely [Co(L)(ip)] n ( 1 ), [Co 2 (L) 2 (nip) 2 ] n ( 2 ) and [Co 2 (L) 2 (tbip) 2 ·2H 2 O] n ( 3 ) (L = 1,2-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H 2 ip = isophthalic acid, H 2 nip = 5-nitroisophthalic acid, H 2 tbip = 5-tert-butylisophthalic acid) have been synthesized by hydrothermal methods and characterized by elemental analyses, IR spectra, thermogravimetric analyses and single-crystal X-ray diffraction. Both complexes 1 and 2 exhibit a 2-fold interpenetrating 3D network with 6 6 - dia topology, whereas complex 3 is bridged by the L and tbip 2− ligands to form a rarely tri-nodal (3,3,5) layer with 3,3,5L18 topology. The results indicate that Co(II) mixed coordination polymers structurally modulated by the substituent effect of isophthalate-involved co-ligands. In addition, the fluorescence and catalytic activity of the complexes for the degradation of methyl orange by the sodium persulfate in a Fenton-like process have been investigated. [ABSTRACT FROM AUTHOR]

Multidentate N-heterocyclic compounds form a variety of metal complexes with many intriguing structures and interesting properties. The title coordination polymer, catena-poly[zinc(II)-bis{μ-2-[(1 H-imidazol-1-yl)methyl]-1 H-benzimidazole}-κ2 N3: N3′; N3′: N3-zinc(II)-bis(μ-benzene-1,2-dicarboxylato)-κ2 O1: O2;κ3 O1, O1′: O2], [Zn2(C8H4O4)2(C11H10N4)2] n, has been synthesized by the reaction of Zn(NO3)2 with 2-[(1 H-imidazol-1-yl)methyl]-1 H-benzimidazole (imb) and benzene-1,2-dicarboxylic acid (H2bdic) under hydrothermal conditions. There are two crystallographically distinct imb ligands [imb( A) and imb( B)] in the structure which adopt very similar coordination geometries. The imb( A) ligand bridges two symmetry-related Zn1 ions, yielding a binuclear [(Zn1)2{imb( A)}2] unit, and the imb( B) ligand bridges two symmetry-related Zn2 ions resulting in a binuclear [(Zn2)2{imb( B)}2] unit. The above-mentioned binuclear units are further connected alternately by pairs of bridging bdic2− ligands, forming an infinite one-dimensional chain. These one-dimensional chains are further connected through N-H...O hydrogen bonds, leading to a two-dimensional layered structure. In addition, the title polymer exhibits good fluorescence properties in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

Two new Cd( II) complexes, {[Cd( COO)2]2· 2H2O} n ( 1) and {[ CdCl( COO)2(Hbmi)]· H2O} n ( 2), were obtained through the reactions of oxalic acid (H2ox) with CdCl2 ·2. 5H2O in the presence of 1-[(benzoimidazol-yl)methyl]-1 H-tetrazole (bmt) or 1-[(benzoimidazol-yl)methyl]-1 H-imidazol (bmi). Single-crystal X-ray diffraction shows that complex 1 has a 3-D structure with the topological notation of (48 · 62)(46 · 66 · 83)(42 · 84), in which the oxalate displays two kinds of coordination modes: formation of the layers (μ6-ox) and linking the layers (μ4-ox). In complex 2, oxalates bridge Cd(II) ions, forming a 1-D chain, and (Hbmi)+ cations coordinate to the Cd(II) ions in monodentate mode and hang at two sides of the main chain. This indicates that subtle modification of the N-donor ligands can result in complexes with different compositions and architectures. Moreover, their IR spectra, PXRD (powder X-ray diffraction) patterns, thermogravimetric analyses, and fluorescence properties are also investigated. [ABSTRACT FROM AUTHOR]

In the coordination polymer, poly[[{μ-1-[(1 H-benzimidazol-2-yl)methyl]-1 H-imidazole-κ2 N: N′}(μ-5-carboxybenzene-1,3-dicarboxylato-κ2 O1: O3)zinc(II)] dimethylformamide monosolvate pentahydrate], {[Zn(C9H4O6)(C11H10N4)]·C3H7NO·5H2O} n, the ZnII ion is coordinated by two N atoms from two symmetry-related 1-[(1 H-benzimidazol-2-yl)methyl]-1 H-imidazole (bmi) ligands and two O atoms from two symmetry-related 5-carboxybenzene-1,3-dicarboxylate (Hbtc2−) ligands in a slightly distorted tetrahedral geometry. The ZnII ions are bridged by Hbtc2− and bmi ligands, leading to a 4-connected two-dimensional network with the topological notation (44.62). Adjacent layers are further connected by 12 kinds of hydrogen bonds and also by π-π interactions, resulting in a three-dimensional supramolecular architecture in the solid state. [ABSTRACT FROM AUTHOR]

The combination of N-heterocyclic and multicarboxylate ligands is a good choice for the construction of metal-organic frameworks. In the title coordination polymer, poly[bis{μ2-1-[(1 H-benzimidazol-2-yl)methyl]-1 H-tetrazole-κ2 N3: N4}(μ4-butanedioato-κ4 O1: O1′: O4: O4′)(μ2-butanedioato-κ2 O1: O4)dicadmium], [Cd(C4H4O4)(C9H8N6)] n, each CdII ion exhibits an irregular octahedral CdO4N2 coordination geometry and is coordinated by four O atoms from three carboxylate groups of three succinate (butanedioate) ligands and two N atoms from two 1-[(1 H-benzimidazol-2-yl)methyl]-1 H-tetrazole (bimt) ligands. CdII ions are connected by two kinds of crystallographically independent succinate ligands to generate a two-dimensional layered structure with bimt ligands located on each side of the layer. Adjacent layers are further connected by hydrogen bonding, leading to a three-dimensional supramolecular architecture in the solid state. Thermogravimetric analysis of the title polymer shows that it is stable up to 529 K and then loses weight from 529 to 918 K, corresponding to the decomposition of the bimt ligands and succinate groups. The polymer exhibits a strong fluorescence emission in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

In the title coordination polymer, catena-poly[[bis[{1-[(1 H-benzimidazol-2-yl-κ N3)methyl]-1 H-tetrazole}zinc(II)]-bis(μ4-pentane-1,5-dioato-1:2:1′:2′κ4 O1: O1′: O5: O5′)] methanol disolvate], {[Zn(C5H6O4)(C9H8N6)]·CH3OH} n, each ZnII ion is five-coordinated by four O atoms from four glutarate ligands and by one N atom from a 1-[(1 H-benzimidazol-2-yl)methyl]-1 H-tetrazole (bimt) ligand, leading to a slightly distorted square-pyramidal coordination environment. Two ZnII ions are linked by four bridging glutarate carboxylate groups to generate a dinuclear [Zn2(CO2)4] paddle-wheel unit. The dinuclear units are further connected into a one-dimensional chain via the glutarate ligands. The bimt ligands coordinate to the ZnII ions in a monodentate mode and are pendant on both sides of the main chain. In the crystal, the chains are linked by O-H...O and N-H...O hydrogen bonds into a two-dimensional layered structure. Adjacent layers are further packed into a three-dimensional network through van der Waals forces. A thermogravimetric analysis was carried out and the photoluminescent behaviour of the polymer was investigated. [ABSTRACT FROM AUTHOR]

Two new complexes, {[Zn(imb)(SO4)]·H2O}n(1) and {[Cd2(imb)2(SO4)2(H2O)]·CH3OH}n(2) (imb?=?2-(1H-imidazol-1-methyl)-1H-benzimidazole), have been solvothermally synthesized. Single-crystal X-ray diffraction shows that1displays a 2-D (4,4) network, which is further extended to a 3-D supramolecular structure by hydrogen bonding interactions. Complex2exhibits a 3-D framework with (3,5)-connected (42·6)2(42·65·83)2topology. The results indicate that changing metal ions can influence the coordination modes of sulfate, and then affect the structures of the complexes. In addition, IR and UV–vis spectra, powder X-ray diffraction patterns, thermogravimetric analyses, and fluorescent properties of both complexes have been investigated. Two new complexes, {[Zn(imb)(SO4)]·H2O}n(1) and {[Cd2(imb)2(SO4)2(H2O)]·CH3OH}n(2), have been synthesized and characterized by single crystal X-ray diffraction. Additionally, their UV–vis, IR, Thermogravimetric analyses and fluorescent properties are also investigated. [ABSTRACT FROM AUTHOR]

Highlights: [•] Highly c-axis oriented ScAlN thin films were prepared on silicon substrates. [•] ScAlN film prepared at 130W exhibits excellent electrical properties. [•] Sputtering power is a remarkable factor influencing film's structure and properties. [•] The influencing rules of sputtering power were obtained. [Copyright &y& Elsevier]

Two new complexes, {[Cd(btec)0.5(imb)(CH3OH)]·CH3OH}n(1) and {[Cd(btec)0.5(H2btec)]·(H2imb)·2H2O}n(2) (H4btec = 1,2,4,5-benzenetetracarboxylic acid, imb = 2-(1H-imidazol-1-methyl)-1H-benzimidazole), have been synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. Both complexes exhibit 2-D network structures. In1, each 1,2,4,5-benzenetetracarboxylate links four Cd2+cations, and each Cd2+cation connects two 1,2,4,5-benzenetetracarboxylates, to form a 2-D layer, with the imb ligands located on each side of the 2-D layer. In2, there are two kinds of 1,2,4,5-benzenetetracarboxylates in the structure. One kind is completely deprotonated and acts as hexadentate linkers, leading to a 2-D layer. The other kind is only doubly deprotonated and decorates each side of the 2-D layer. In2, imb is protonated, forming (H2imb)2+cations that only cocrystallize with the negatively charged Cd coordination polymer ({[Cd(btec)0.5(H2btec)]2?}n), but does not coordinate to the Cd2+cations. IR spectra, PXRD patterns, thermogravimetric analyses, and fluorescent properties of1and2have also been determined. [ABSTRACT FROM PUBLISHER]

The significant involvement of weak intermolecular interactions and steric and/or symmetry-related packing features was assessed with supramolecular arrays of 4-hydroxyphenyl amides in the crystal structure. The one-dimensional chain is observed in the aryl substituted 4-hydroxyphenyl amides, while alkyl analogs generate 2D or 3D arrays. A comparison of supramolecular assemblies in the similar 4-hydroxyphenyl amide compounds in the Cambridge Structural Database has been presented. It is correlated with the different steric constraints of aryl and alkyl groups to create chains, 2D sheets and 3D-interpenetrated networks in the asymmetric 4-hydroxyphenyl amides. A comprehensive analysis of crystal packing and energy features of the selected 4-hydroxyphenyl amide derivatives is reported. [ABSTRACT FROM AUTHOR]

Abstract: The diphosphine ligand bis(5-(tert-butyl)-3-((diphenylphosphino)methyl)-2-methoxyphenyl)methane (BDMMphos) has been metallated with the transition metal complexes Ag(CH3CN)4BF4 and Au(Me2S)Cl to yield the corresponding diphosphine metal complexes (BDMMphos)AgBF4 (1), (BDMMphos)(AuCl)2 (2) and (BDMMphos)AuClO4 (3). All of the complexes were characterized by elemental analyses, 1H, 31P and 13C NMR spectroscopies and X-ray structure determination. The diphosphine ligand BDMMphos displayed versatile coordination properties. In complexes 1 and 3, BDMMphos chelated metal ions to form stable 12-membered ring complexes with large bite angles, while in complex 2, BDMMphos simply coordinated to two AuCl units as a bridging ligand. [Copyright &y& Elsevier]

Abstract: A novel chiral metal–organic coordination polymer [Mn2(C7H8O6)2(bipy)2(H2O)2]·6H2O (1) (C7H8O6 =2,3-O-isopropylidene-L-tartrate dianion, bipy=4,4′-bipyridine) has been solvothermally synthesized in high yield and fully characterized, including by single crystal and powder X-ray diffractions. The analysis of X-ray crystallography revealed that a two-dimensional (2-D) rectangular-grid layer with a cavity dimension of 11.658×5.273Å2, which can be survived up to 200°C, has been constructed. In the polymer 1 through the oxygen atoms of tartrates and the coordinated water molecules, the 2-D rectangular-grid layers are hydrogen-bonded to the lattice water chains to form a 3-D supramolecular network. Preliminary investigation reveals that 1 shows weak antiferromagnetic interactions between the Mn(II) centers. [Copyright &y& Elsevier]

Two new complexes, [Cd2(H4ebidc)2(CH3OH)4] · 2CH3OH (1) and {[Cd(Cl)(I)(H6ebidc)1/2] · 1/2bbe · H2O} n (2) (H6ebidc = 2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4,5-dicarboxylic acid), bbe = 1,2-bis(2-benzimidazolyl)ethane), are obtained through self-assembly of H6ebidc with Cd(II). Single-crystal X-ray diffraction shows that 1 has a binuclear structure and each tridentate chelating ligand coordinates to two Cd(II) ions with µ2-O. Complex 2 displays a 1-D chain structure and each tetradentate ligand bridges two Cd(II) ions in chelating fashion. Fluorescent properties have also been determined. [ABSTRACT FROM AUTHOR]

Abstract: Three dinuclear Mn(II) complexes, [Mn2(EGTB)(NO3)2(H2O)4](NO3)2 (1), [Mn2(EGTB)(NO3)4] (2) and [Mn2(EGTB)(NO3)(H2O)](NO3)3 (3) (EGTB= N,N,N′,N′-tetrakis(2′-benzimidazolylmethyl)-1,4-diethylene amino glycol ether) were prepared and characterized. Their crystal structures revealed a relationship between synthesis temperature and structure. With increasing the reaction temperature from 60 to 120°C or 160°C, the Mn–Mn distances are shortened from 14.019Å in 1, 7.662Å in 2 to 5.662Å in 3. Additionally, polyphenol oxidase (PPO) activity of those three complexes was studied by measuring the rate of increase in absorbance at 320nm of pyrogallol substrate. At pH 7.8 and 30°C, the turnover numbers are 5.58h−1 for 1, 11.38h−1 for 2 and 13.97h−1 for 3, respectively. Furthermore, in pH 7.8–8.2, their catalytic activity increased with rising pH. [Copyright &y& Elsevier]

Three new complexes, [Cd(L)I2]2 (1), {[Cd(L)I2] · DMF} n (2), and [Cd2(L)4(μ 2-I)I(H2O)] n (3), have been obtained through self-assembly of an unsymmetrical ligand 2-(1H-imidazol-1-methyl)-1H-benzimidazole (L) with Cd(II) salts. Single-crystal X-ray diffraction shows that 1 displays a dimeric structure in which two Cd(II) ions are bridged by two bidentate bridging L. Complex 2 exhibits a 1-D chain structure (···Cd–L–Cd–L···) constructed by L bridging Cd(II) ions. In 3, the Cd(II) ions are five-connected nodes and linked by L and iodide leading to the 3-D network. Complexes 2 and 3 are synthesized maintaining the same solvents and stoichiometric ratio of metal and ligand at different reaction temperature. The different structures of the complexes indicate that the temperature plays a significant role in construction of the complexes. Luminescent properties of 1–3 have been investigated in the solid state at room temperature. [ABSTRACT FROM PUBLISHER]

Four Cu(II)-containing complexes based on 2-(1H-imidazol-1-methyl)-1H-benzimidazole (imb), [Cu2(imb)2Cl4] · 2CH3OH (1), {[Cu(imb)(bdic2−)] · 1.5H2O · DMF} n (2), {[Cu(imb)(bdic2−)] · 2H2O} n (3), and {[Cu3(imb)2(Hbdc3−)2] · 2H2O} n (4), where H2bdic = 1,3-benzenedicarboxylic acid and H4bdc = 1,2,4,5-benzenetetracarboxylic acid, have been synthesized and characterized by single-crystal diffraction. Dinuclear 1 is isolated by the reaction of imb with CuCl2 · 2H2O. When H2bdic is added in the reaction with the other experimental conditions unchanged, 2 with a different structure is obtained. The [Cu2(imb)2] dinuclear units are linked through bdic2− groups to form a 2-D structure. The imb reacts with CuCl2 · 2H2O and H2bdic at 80°C to give 3, which exhibits a 2-D (4,4) network. With the replacement of H2bdic with H4bdc in the above reaction, 4 is formed featuring a 2-D structure in which Hbdc3− is a six-connecting group. Their IR spectra and thermogravimetric analyses are also investigated. [ABSTRACT FROM PUBLISHER]

Two new coordination polymers formulated as {[Zn(bdic)(bmt)H2O] · 0.5H2O} n (1) and {[Cd(bdic)(bmt)(H2O)2] · 2H2O} n (2) (H2bdic = 1,3-benzenedicarboxylic acid, bmt = 1-((benzotriazol-1-yl)methyl)-1-H-1,2,4-triazole) have been synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. Both coordination polymers exhibit 1-D chain structure where bmt is unidentate and bdic2− bridging. In 1, bmt hangs at two sides of the main chain, whereas bmt hangs at one side of the main chain in 2. Fluorescent properties have also been determined. [ABSTRACT FROM AUTHOR]

Abstract: Five new 0D–2D Cd(II) complexes, [Cd2(Hbimt)2I4] (1), [Cd(bimt)(Hbimt)Br] n (2), [Cd(Hbimt)Cl2(H2O)] n (3), {[Cd(Hbimt)(SO4)(H2O)2]·1.5H2O} n (4) and [Cd(Hbimt)(SCN)2] n (5) (Hbimt=2-((benzoimidazol-yl)methyl)-1H-tetrazole) have been synthesized by the reactions of Hbimt with suitable cadmium salts. Employment of different anions can influence the coordination modes of the Hbimt ligand, and accordingly result in different structures ranging from 0D to infinite 1D and 2D networks. Complex 1 displays a dimeric structure in which two Cd(II) ions are bridged through two iodine atoms. Complex 2 was caused by deprotonation of the Hbimt ligand, resulting in a 1D helical chain. While in complexes 3 and 4, Hbimt acts as a bidentate bridging ligand which joins two Cd(II) ions, leading to 1D stair-like chains. Complex 5 exhibits a 2D network structure with infinite 1D [Cd2(SCN)2] n chains. The distinct structures of 1, 2, 3, 4 and 5 reveal that the anions and the versatile coordination modes of the ligand play an important role in the structures of the complexes. In addition, the luminescent properties of complexes 1–5 have been investigated in the solid state at room temperature. [Copyright &y& Elsevier]

Two trinuclear Ni(II) complexes Ni3(L1)2(py)2(DMF)(H2O) (1) and Ni3(L2)2(py)2(DMF)2 (2) with two new trianionic pentadentate ligands N-(3,5-dimethylbenzoyl)-salicylhydrazide (H3L1) and N-(phenylacetyl)-5-nitrosalicylhydrazide (H3L2) have been synthesized and characterized by X-ray crystallography. Nickel ions in the two complexes have square-planar/octahedral/square-planar coordination. Central metal ion and two terminal metal ions in the two complexes are combined by two bridging deprotonated ligands, forming a trinuclear structural unit with an M-N-N-M-N-N-M core. Studies on the trinuclear Ni(II) complexes show that the β-branched N-acylsalicylhydrazide ligands with sterically flexible Cα methylene groups yield linear trinuclear Ni(II) complexes, while α-branched N-acylsalicylhydrazide ligands tend to form bent trinuclear Ni(II) complexes. Antibacterial screening data in a previous study indicates that bent trinuclear Ni(II) compound 1 is more active than linear compound 2 and less active than a tetranuclear nickel compound. [ABSTRACT FROM AUTHOR]

Two dinuclear complexes [M2(EGTB)(NO3)2(DMF)2](NO3)2 · 2DMF (M = Cu, 1; Co, 2) were synthesized and structurally characterized, EGTB is N,N,N',N'-tetrakis (2-benzimidazolylmethyl)-1,4-diethylene amino glycol ether, and DMF is dimethylformamide. The polyphenol oxidase (PPO) activities of 1 and 2 on pyrogallol oxidation have been investigated, showing that the rate constants kcat increase with increases of reaction temperatures and pH. [ABSTRACT FROM AUTHOR]

The syntheses, IR, molecular structures, and luminescence of [M(HIMDC)(4, 4'-bipyO)0.5(H2O)]n [H3IMDC = 4, 5-imidazoledicarboxylate, 4, 4'-bipyO = 4, 4'-bipyridine-N, N'-dioxide, M = Co (1) and Zn (2)] are reported. The most notable structure feature of 1 and 2 is that the left-handed and right-handed helical chains constructed from 4,5-imidazoledicarboxylate and metal are linked by 4,4'-bipyO to generate infinite 2-D herringbone architectures. 2 exhibits strong fluorescent emission in the solid state at room temperature. [ABSTRACT FROM AUTHOR]

Abstract: Two new trinuclear complexes, Cu3L2(py)2 (1) and Ni3L2(py)4 (2), have been synthesized and characterized, where L3− is N-2-methyl-acryloyl-salicylhydrazidate. Central metal ion and two terminal metal ions in the two complexes are combined by two bridging deprotonated L3− ligands, forming a bent trinuclear structure unit with an M–N–N–M–N–N–M core. The bent angles in complexes 1 and 2 are 167.6(1)° and 75.4(1)°, respectively. Three nickel ions in compound 2 exhibit alternating square-planar and octahedral geometries, while three copper ions in compound 1 follow square-planar mode. The studies in solution integrity and stability of compounds 1 and 2 show they are soluble and stable in DMF. UV–Vis titrations demonstrate compound 1 is stable in DMF even in the presence of excess metal ions. Antibacterial screening data indicate the two compounds all have stronger antimicrobial activities against the tested microorganisms than ligand. The trinuclear copper compound 1 is more active than monocopper compounds in the previous study, and the trinuclear nickel compound 2 is less active than tetranuclear nickel compound in the previous study. [Copyright &y& Elsevier]

The reaction of Cu(NO3)2 with salicylidene-[1-(t-butyl)-5-methyl-1H-pyrazole]-formohydrazine (Hsal-pfh, 1) gives a binuclear Cu(II) complex [Cu2(sal-pfh)2(NO3)2] (2). The structure of the ligand was characterized by IR, EA, 1H NMR spectroscopy. The binuclear Cu complex was determined by X-ray crystallography and thermal analysis. The two Cu(II) ions are bridged by two O atoms and each copper ion is surrounded by an asymmetric sal-pfh chromophore and a [image omitted] group. The coordination around each copper can be best described as a distorted square-pyramidal geometry. The electrochemical experimental results indicate that 2 can bind to DNA with good stability. [ABSTRACT FROM AUTHOR]

• A novel isolated cluster-based iodocuprate has been successfully constructed. • The iodocuprate is templated by in situ generated metal-organic complex. • The compound exhibits a high photocatalytic degradation performance on dye pollutant. A novel isolated cluster-based iodocuprate [Cu(1,10-phen) 3 2 [Cu 11 I 15 (1) was successfully constructed with in situ generated [Cu(1,10-phen) 3 2+ cation as the charge balancer and structural directing agent. In compound 1 , the linkage of Cu(I) and I- generated an anionic [Cu 3 I 4 building unit, and alternate connection of these moieties with each other further gave rise to a bowknot-like high-nuclearity Cu-I cluster. By virtue of the intermolecular forces, a three-dimensional supramolecule was finally fabricated with the transition metal complex as the template and guest species. A short Cu-Cu distance could be observed, suggesting the existence of closed-shell d10-d10 cuprophilic interaction in the structure of 1. Interestingly, the photocatalysis experiment has been performed on solid 1 , which implies that the title compound could be acted as a promising visible light driven photocatalyst for the degradation of the organic dye indigo carmine (IC). In addition, the mechanism for the photodegradation process has been discussed in detail. [ABSTRACT FROM AUTHOR]

C24H15NO, monoclinic, P21/n (no. 14), a = 10.3161(3) Å, b = 5.53330(10) Å, c = 29.2019(7) Å, β = 97.341(1)°, V = 1653.24(7) Å3, Z = 4, Rgt(F) = 0.0423, wRref(F2) = 0.1344, T = 294(2) K. [ABSTRACT FROM AUTHOR]

Ni x Al y Mn 3− x − y O 4 (0 < x < 0.6; 0 < y < 0.3) series NTC chip thermistors with homogeneous chemical compositions and high-pure spinel phases were fabricated via a tape casting-lamination-sintering process. The multi-variate cation distribution model was established as (Mn 1 - x + v 2 + Ni x - v 2 +) Mn 2 - 2 v - y 3 + Mn v 4 + Ni v 2 + Al y 3 + O 4 (0 < v < 0.5). The conduction mechanism was proposed based on a nearest neighbor hopping (NNH) model. They were verified coherently by cation-oxyanion chemical compositions (XRF/EDS), valence states (XPS), phase structures and Rietveld refinements (XRD), IR vibrations and electrical analyses. The obtained NTC chips were well suitable for commercial applications with a high reliability and with regulable ρ 25 (4080 ± 135 ∼ 15,760 ± 526 Ω cm) and B 25/50 (4016 ± 20 ∼ 4251 ± 13 K). • Ni x Al y Mn 3− x − y O 4 (0 < x < 0.6; 0 < y < 0.3) specimens were fabricated via a tape casting-lamination-sintering process. • The multi-variate cation distribution model was established. • The conduction mechanism was proposed based on a nearest neighbor hopping (NNH) model. • MNA-series NTC chip thermistors have a high reliability and apply to the commercial production in microelectronic industry. [ABSTRACT FROM AUTHOR]