A One-Dimensional Pyrazine Bridged Copper(II)-Saccharinato Coordination Polymer

Abstract

A one-dimensional copper(II) complex {[Cu(sac)2(μ-pyz)(H <inf>2</inf>O)]·H<inf>2</inf>O}<inf>n</inf> (1) (pyz = pyrazine, and sac = saccharinate) has been synthesized and characterized by elemental analysis, IR spectroscopy, thermal and single crystal X-ray analyses. Complex 1 crystallizes in the triclinic space group P1. The [Cu(sac)<inf>2</inf>(H<inf>2</inf>O)] units are bridged by pyz leading to a one-dimensional alternating chain in which the copper(II) ions exhibit a distorted square-pyramidal coordination of CuN<inf>4</inf>O. The intradimer Cu⋯Cu distance is 6.881 Å, while interdimer Cu⋯Cu distance is 7.066 Å. The supramolecular interactions are mainly controlled by the sac anion and water molecules. The individual chains are linked by strong OW-H⋯O(sac) hydrogen bonds into a two-dimensional layers, which are further arranged in a three-dimensional supramolecular network by aromatic π(sac)⋯π(sac) stacking interactions and CHπμ(pyz) interactions. Thermal analysis of complex 1 shows that the decompositions of the aqua, pyz and sac ligands are observed as distinct steps on the DTA and TG curves. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.