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Three Cu(I)-cyanide coordination polymers based on trigonal 1,3,5-tris(1H-imidazol-1-yl)benzene (tib) ligand, namely [Cu 3 (CN) 3 (tib)] n ( 1 ), [Cu 4 (CN) 4 (tib)] n ( 2 ), and [Cu 2 (CN) 2 (tib)] n ( 3 ), have been prepared and characterized by elemental analysis, IR, PXRD, thermogravimetry and single-crystal X-ray diffraction analysis. Complex 1 displays a 3D metal-organic framework with nanosized pores. Complex 2 is a 3D coordination polymer assembled by three μ 2 -cyanides and a μ 3 -cyanide with a very short Cu(I)···Cu(I) metal bond(2.5206 Å). Complex 3 is a 2D coordination polymer constructing from 1D Cu(I)-cyanide zigzag chain and bidentate tib spacer. Three Cu(I) complexes are thermally stable up to 250–350 °C. Complexes 1 – 3 show similar orange emission band at 602 nm originating from LMCT mechanism. [ABSTRACT FROM AUTHOR]

Abstract: The reactions of metal salts with pyrazine-2,3-dicarboxylic acid (H2pzdc), pyridine-2,5-dicarboxylic acid (H2pydc), pyrazine-2,3,5,6-tetracarboxylic acid (H4pztc), 4,4′-bipyridine (bipy) and 1,10-phenanthroline (phen) afforded four new ternary complexes, namely [Co2(pzdc)2(bipy)(H2O)2] n ·3nH2O (1), [Zn2(pzdc)2(bipy)(H2O)2] n ·3nH2O (2), [Co(pydc)2(H2O)2](H2bipy) (3) and [Cu2(pztc)(phen)2(H2O)2]·2HNO3·2H2O (4). The metal centers are all six-coordinated. Compounds 1 and 2 are 2D coordination polymers exhibiting wave-like polymeric networks. The 2D layers are stacked in an interpenetrating mode to form double-layered frameworks, which possess ∼8Å×6Å tunnels occupied by (H2O)6 clusters. Compound 3 is a mononuclear supramolecular compound in which 4,4′-bipyridine is protonated and acted as a cationic building block. Compound 4 is a centro-symmetric binuclear complex. Pztc4− as a hexadentate ligand coordinates to two Cu(II) ions to form four chelating rings. Phen are arranged in an ABAB parallel fashion to form a supramolecular architecture incorporating HNO3 lattice molecule. The thermal stabilities of 1−4 and luminescence of zinc complex 2 were also investigated. [Copyright &y& Elsevier]

Abstract: Hydrothermal reaction of CuCN with 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) affords a wave-like infinite chain coordination polymer [Cu2(CN)2(3-bpo)] n (1). Replacement of 3-bpo by its isomer 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (4-bpo) could yields polymer [Cu(CN)(4-bpo)] n (2). In the complex 1, the bent 3-bpo ligand adopts bidentate chelating mode binds with the Cu(I)-cyanide chain to form 16-membered macrocyclic structure. The complex 2 exhibits a layered metal–organic framework, in which exo-bidentate 4-bpo ligand connects the Cu(I)-cyanide chains to form 2-D rectangle grid. Both of these Cu(I) complexes are thermal stable under 200°C and release 3-bpo or 4-bpo ligand in 200–360°C. Luminescent study reveals that 1 has green-light emission, while 2 has blue-light emission. [Copyright &y& Elsevier]

Abstract: Three supramolecular compounds, [Mn2(chda)(phen)4(H2O)]·(ClO4)2·phen·4H2O (1), [Cu(mal)(bipy)] n ·2nH2O (2) and [Cu(ca)2(bipy)]·2H2O (3) (chda=1,1-cyclohexanediacetate, mal=maleate, Hca=cyanuric acid, bipy=2,2′-bipyridine), have been synthesized and characterized by elemental analyses, IR spectra, thermal analyses and X-ray structural analyses. Compound 1 is a carboxylate-bridging binuclear complex incorporating uncoordinated 1,10-phenanthroline bonded by hydrogen bonding and π–π stacking interactions. Compound 2 is a 1D zigzag chain carboxylate coordination polymer incorporating cyclic (H2O)4 tetramers of lattice water, which further connect the zigzag chains through strong hydrogen bonds to form 2D supramolecular network. Compound 3 is a mononuclear complex in which H-bonding (H2O)8 water clusters further combine the complex through hydrogen bonds to form supramolecular framework. Thermal stabilities of 1 and 3 have also been investigated. [Copyright &y& Elsevier]

Abstract: Hydrothermal reaction of CuCN, K3[Fe(CN)6] with 4-(6-amino-2-pyridyl)-1,2,4-triazole (apt) afforded a coordination polymer [Cu7(CN)7(apt)2] n (1), while solvothermal reaction of CuSCN with apt in acetonitrile afforded a coordination polymer [Cu2(SCN)2(apt)] n (2). Complex 1 shows two-dimensional polymeric network with large hexagonal channels constructing by CuCN chains and tridentate apt ligands. Complex 2 shows two-dimensional polymeric framework assembled by ladder-like [Cu(SCN)] n chains and bidentate apt ligands, in which thiocyanate acts as a tridentate bridging ligand. Both polymers are thermal stable and strong fluorescent in the solid state. [Copyright &y& Elsevier]

Abstract: Two new cyano-bridged bimetallic complexes, [Cu(TAAB)Fe(CN)5(NO)]·2H2O (1) and [Mn(bpy)2(H2O)Fe(CN)5(NO)]·H2O (2) (where TAAB=tetrabenzo[b,f,j,n][1,5,9,l3]tetraaza-cyclohexadecine and bpy=2,2′-bipyridine), have been synthesized and characterized by elemental analyses, IR spectra and TG-DSC analyses. Single crystal X-ray structure analyses revealed that the complex 1 has a cyano-bridged binuclear structure in which Cu(II) center is coordinated by tetraazacyclic TAAB ligand to form an intriguing saddle-shaped structure, and Fe(II) center is in an octahedral coordination environment with nitrosyl group trans to the cyano-bridge. In complex 2, Mn(II) center is cis six-coordinated and linked to nitroprusside though a bridging cyanide group to form a binuclear structure, while the nitrosyl group is cis to the cyano-bridge. The thermal stabilities of both complexes were investigated, which shows the nitrosyl and cyanide groups of nitroprusside released by two-steps in the temperature range of 200–380°C. [Copyright &y& Elsevier]

Abstract: Two acetylenedicarboxylate complexes, [Mn2(C4O4)(phen)4(H2O)2](ClO4)2·H2O (1) and [Cu(C4O4)(2,2′-bpy)] n (2), have been synthesized and characterized by elemental analyses and IR spectra. MnII ions have distorted octahedral coordination geometry and bridged by C4O4 2− to form a binuclear structure. Thermal analysis shows C4O4 2− released in the range of 180–280°C. CuII is five-coordinated by 2,2′-bipyridine and three oxygen atoms from three different C4O4 2− ligands, leading to a square-pyramidal coordination geometry. Each C4O4 2− links three CuII centers through bifunctional carboxylate to form a polymeric structure of (4,4) layers with nodes being dimer of Cu2O2 and bridges of C4O4 2−. Its variable-temperature magnetism was also investigated. [Copyright &y& Elsevier]

Four unique complexes with diverse coordination architectures were synthesized upon complexation of 5,5-(1,4-phenylenebis (methylene))bis (oxy)- diisophthalic acid (H 4 L) with zinc ions by using different solvent. namely, {[Zn(H 2 L) (bpp)]·DEF} n ( 1 ), {[Zn 2 (L) (bpp) 2 ]·4H 2 O} n ( 2 ), {[Zn 2 (L) (pdp) 2 ]·3H 2 O·DEF} n ( 3 ), {[Zn 2 (L) (pdp) 2 ].4H 2 O} n ( 4 ). Complexes 1 , 2 and 3 , 4 are obtained by varying solvents to control their structures. The size of solvent molecular plays an important role to control different structure of these compounds. Compound 1 is 2D waved framework with (4, 4) grid layer as sql topology. Compound 3 displays a (4,6)-connected 2-nodal net with a fsc topology. Compounds 2 and 4 are all three-dimensional network simplified as (4,4)-connected 2-nodal net with a bbf topology. The photochemical properties of compounds 1 – 4 were tested in the solid state at room temperature, owing to their strong luminescent emissions, complexes 1 – 4 are good candidates for photoactive materials. [ABSTRACT FROM AUTHOR]

Abstract: Three new copper(II) azide coordination polymers with derivatives of 1,2,4-triazole as bridging coligands, namely [Cu2(admtrz)2(N3)4] n (1) (admtrz=4-amino-3,5-dimethyl-1,2,4-triazole), [Cu(4-abpt)(N3)2] n ·2nH2O (2) (4-abpt=4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole) and [Cu3(2-ptrz)2(N3)6] n (3) (2-ptrz=4-(2-pyridyl)-1,2,4-triazole), were prepared and characterized by elemental analyses, IR spectra and X-ray structural analyses. Compound 1 has a 1D chain structure in which Cu(II) ions are bridged by end-on (EO) azides and admtrz ligands. This compound contains three kinds of coordination modes for Cu(II) ions, including tetrahedral, square pyramidal and octahedral geometries. Compound 2 displays an interesting 3D framework structure, in which the azide ligands link Cu(II) ions in end-to-end (EE) mode affording a 2D square layer. This 2D layers are further bridged by bent 4-abpt ligands to form an interesting 3D framework. Furthermore, this structure also exhibits an alpha-Po net topology. Compound 3 displays a 1D rectangle-like chain structure linked by azides adopting end-on (EO) and end-to-end (EE) modes and 2-ptrz ligands. The IR and thermal stabilities of these coordination polymers 1–3 have also been studied. [Copyright &y& Elsevier]

Abstract: Reactions of 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole (3-abpt) with metal acetates gave rise to four new complexes [Cu(3-abpt)(ip)] n ·2nH2O (1), [Co(3-abpt)(ip)(H2O)2] n ·2nH2O (2), [Ni(3-abpt)(tp)(H2O)2] n (3) and [Cu(3-abpt)2(CH3COO)2(H2O)2] (4) (ip=isophthalate, tp=terephthalate), which were characterized by EA, IR and X-ray crystallography. Compound 1 consists of two kinds of ring-like chain which are interconnected to form an unusual two-dimensional layered motif. Compounds 2 and 3 are both 1D ring-like infinite chains. Compound 4 is a mononuclear complex. The thermal stabilities of coordination polymers 1–3 have been investigated. [Copyright &y& Elsevier]