A one-dimensional pyrazine bridged Copper(II)-Saccharinato coordination polymer

Abstract

A one-dimensional copper(II) complex {[Cu(sac)(2)(mu-pyz)(H2O)] center dot H2O}(n) (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 P (1) over bar. The [Cu(sac)(2)(H2O)] 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 CuN4O. The intradimer Cu center dot center dot center dot Cu distance is 6.881 angstrom, while interdimer Cu center dot center dot center dot Cu distance is 7.066 angstrom. The supramolecular interactions are mainly controlled by the sac anion and water molecules. The individual chains are linked by strong OW-H center dot center dot center dot O(sac) hydrogen bonds into a two-dimensional layers, which are further arranged in a three-dimensional supramolecular network by aromatic pi(sac)center dot center dot center dot pi(sac) stacking interactions and CH center dot center dot center dot pi(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.