Search

Three new coordination polymers, [Cu(butca)0.5(bipy)(H2O)]n · 2nH2O (1), [Zn(H2butca) (phen)(H2O)]n · nH2O (2), and [Cd(H2chhca)0.5(phen)(H2O)]n · 2nH2O (3) (H4butca =1,2,3,4-butanetetracarboxylic acid, H6chhca = 1,2,3,4,5,6-cyclohexanehexacarboxylic acid), were prepared and characterized by EA, IR, TG, and X-ray crystallography. Complex 1 is a 1-D double-chain coordination polymer in which tetradentate butca4- coordinates to four Cu(II) ions through four monodentate carboxylates. Complex 2 is a 1-D chain with tridentate H2butca2- coordinating to two Zn(II) ions through monodentate and chelating carboxylates. Complex 3 is a 1-D double-chain coordination polymer. H2chhca4- is octadentate coordinating to four Cd(II) ions through four chelating carboxylates. Hydrogen bonds and π-π stacking interactions play important roles in the formation of supramolecular architectures. The thermal stabilities of 1-3 show dehydrated coordination polymers are thermally stable in the range 260-400°C. [ABSTRACT FROM AUTHOR]

Hydrothermal reactions of CuCN, K3[Fe(CN)6] with 2,2'-bipyridine, 1,10-phenanthroline or 2,6-bis(1,2,4-triazolyl)pyridine (btp) afford three coordination polymers, [Cu7(CN)7(bipy)2]n (1), [Cu2(CN)2(phen)]n (2) and [Cu3(CN)3(btp)]n (3). Complex 1 displays 1D polymeric ribbons which are assembled through Cu ··· Cu and π-π stacking interactions into a 3D framework. Complex 2 shows a 1D zigzag chain structure in which phen is a side ligand. In 3, the copper cyanide 2D polymeric networks are connected by tridentate btp to form a 3D metal-organic framework. These coordination polymers exhibit strong fluorescent emissions in the solid state. [ABSTRACT FROM AUTHOR]

Three polycarboxylate coordination polymers containing 2-(2-pyridyl)benzimidazole as co-ligand, [Cu(Bdc)(2-PyBIm)]n (1), [Cu(HBtc)(2-PyBIm)]n (2) and [Cd2(HBtc)2(2-PyBIm)2]n ·; nH2O (3) (H2Bdc = 1,4-benzenedicarboxylic acid; H3Btc = 1,3,5-benzenetricarboxylic acid), have been synthesized and characterized by elemental analyses, IR spectra, TG-DSC and X-ray structural analyses. Complex 1 is a one-dimensional zigzag chain in which the Cu(II) is cis six-coordinated by two chelating carboxyl groups and a 2-PyBIm ligand. Complex 2 is a two-dimensional (4, 4) network in which H3Btc is partially deprotonated. Complex 3 has a three-dimensional framework in which one Cd(II) is six-coordinate and the other is seven-coordinate. All 2-PyBIm groups are neutral, chelating, bidentate ligands in 1-3. These complexes are quite thermally stable. The luminescence of 3 has also been investigated. [ABSTRACT FROM AUTHOR]