Structure of catena-poly[{(2,2'-bipyridyl)(diperchlorato)copper(II)}-μ-4,4'-bipyridyl]

Abstract

Cu(C10H8N2)(CI0H8N2)(C104)2) , Mr = 574.5, orthorhombic, Pbcn, a=12.413(3), b = 14.645 (3), c = 12.287 (2) , V = 2233.6 (8) A 3, Z = 4, Dx = 1.708 g cm -3, A(Mo Kte) = 0.71069 ,~, /z = 13.12 cm- 1, F(000) = 1164, room temperature, R = 0.050 and wR = 0.049 for 1498 observed reflections. The coordination around Cu n is an elongated dis- torted octahedron. Two N atoms of 2,2'-bipyridyl and two N atoms from two 4,4'-bipyridyls form the equatorial coordination plane, and two perchlorate ions occupy the axial sites. The 4,4'-bipyridyl ligand bridges neighbouring Cu n atoms to form polymeric chains along the c axis in the crystal. The rings of 4,4'-bipyridyl are coplanar and make a dihedral angle of 114 ° with the equatorial coordination plane; the 4,4'-bipyridyl may provide a pathway for mag- netic superexchange interaction between the adjacent Cu ~I atoms. Introduction. In the last decade, a number of binu- clear transition-metal complexes bridged by hetero- cyclic aromatic diamines have been investigated as * To whom correspondence should be addressed.