Ivashkevich Ludmila S, Lyakhov Alexander S, Mosalkova Anastasiya P, Gaponik Pavel N, Ivashkevich Oleg A
Research Institute for Physico-Chemical Problems of Belarusian State University, Leningradskaya Street 14, Minsk 220030, Belarus.
Acta Crystallogr C. 2010 Apr;66(Pt 4):m114-7. doi: 10.1107/S0108270110009510. Epub 2010 Mar 19.
The complex catena-poly[[dibromidocopper(II)]-bis(mu-2-methyl-2H-tetrazol-5-amine)-kappa(2)N(4):N(5);kappa(2)N(5):N(4)], CuBr(2)(C(2)H(5)N(5))(2), (I), and the isotypic chloride complex catena-poly[[dichloridocopper(II)]-bis(mu-2-methyl-2H-tetrazol-5-amine)-kappa(2)N(4):N(5);kappa(2)N(5):N(4)], CuCl(2)(C(2)H(5)N(5))(2), (II), were investigated by X-ray powder diffraction at room temperature. The crystal structure of (I) was solved by direct methods, while the Rietveld refinement of (II) started from the atomic coordinates of (I). In both structures, the Cu atoms lie on inversion centres, adopting a distorted octahedral coordination of two halogen atoms, two tetrazole N atoms and two 5-amine group N atoms. Rather long Cu-N(amine) bonds allow consideration of the amine group as semi-coordinated. The compounds are one-dimensional coordination polymers, formed as a result of 2-methyl-2H-tetrazol-5-amine ligands bridging via a tetrazole N atom and the amine N atom. In the polymeric chains, adjacent Cu atoms are connected by two such bridges.
