Hydrothermal syntheses and structural characterization of four complexes with in situ formation of 1,2,3-triazole-4-carboxylate ligand

Four new complexes constructed by 1,2,3-triazole-4-carboxylate and bipyridyl-like ligands, namely [Cu(ta)(bipy)center dot H(2)O](n) (1), [Mn(2)(ta)(2)(bipy)(2)(H(2)O)(2)center dot 2H(2)O](n) (2), [Zn(ta)(phen)(2)center dot 5H(2)O](n) (3), [Ni(ta)(phen)(2)center dot 8H(2)O](n) (4), (ta = 1,2,3-triazole-4-carboxylate, bipy = 2,2'-bipyridine, phen = 1,10-phen) were prepared under hydrothermal conditions and characterized by IR, elemental analyses and single-crystal X-ray analyses. Where the to ligand is formed in situ by the decarboxylation of 1H-1,2,3-triazole-4,5-dicarboxylic acid. In the complex 1, the Cu (II) ions are bridged by to ligand into a one-dimensional zigzag chain coordination polymer motif. Binuclear [Mn(2)(ta)(2)(bipy)(2)(H(2)O)(2)] units bridged by to ligands are linked into a two-dimensional layered structure via interdimeric hydrogen bonds within the structure of 2. Compounds 3 and 4 are mononuclear complexes. Most interestingly, the crystal-lattice water molecules in complexes 3 and 4 are connected via intermolecular O-H center dot center dot center dot O hydrogen bonds into 1D tapes and 2D layers, respectively. (C) 2009 Elsevier B.V. All rights reserved.