Poly[[diaquadi-μ2-cyanido-bis(μ2-pyrazine-2-carboxylato)dicopper(I)copper(II)] dihydrate]

Abstract

In the title compound, {[CuIICuI2(C5H3N2O2)2(CN)2(H2O)2]·2H2O}n, the CuII atom lies on an inversion centre and is octahedrally coordinated by two N atoms and two O atoms from opposing pyrazine-2-carboxylate (2-pac) ligands and two water O atoms. The CuI atom has a triangular geometry, coordinated by one N atom and one C atom from two bridging cyanide ligands, and another N atom from the 2-pac ligand. The three-dimensional structure features a succession of two-dimensional sheets containing [Cu(CN)]n chains linked by Cu(2-pac)2(H2O)2 groups. The coordinated and free water molecules are involved in an extended three-dimensional hydrogen-bond network with the 2-pac ligands.