The crystal structures of copper dipyridine dichloride and the violet form of cobalt dipyridine dichloride

Abstract

The structures were detd. by x-ray analysis. Cupy2Cl2 is monoclinic, a = 17.00, b = 8.59, c = 3.87 A., b = 91 Deg52', space group P21/n, two centrosymmetric mols. in the cell. The structure consists of square coplanar units (Cu-Cl 2.28 A.; Cu-N 2.02 A.) aggregated into chains running parallel to c by weaker Cu-Cl bonds (3.05 A.) which complete distorted octahedra about each Cu. a-Copy2Cl2 is monoclinic and is referred to a pseudo.ovrddot.orthorhombic cell centered on the oblique face C, a = 34.42, b = 17.38, c = 3.66 A., g = 90 Deg, contg. 8 mols. The corresponding primitive cell has space group P2/b. The Co atoms lie on twofold rotation axes, and the crystal contains 2 formally independent sets of mols. The structure consists of polymeric chains, running parallel to c, in which the co.ovrddot.ordination about the Co is octahedral (Co-Cl 2.49 A.; Co-N 2.14 A). The 2 structures are closely related and appear virtually identical when viewed down the respective c axes. [on SciFinder (R)]