A three-dimensional polymeric mixed-valence copper complex: poly[tri-μ-azido-μ-di-2-pyridyldiazene-dicopper(I,II)

Abstract

The title complex, [Cu2(N3)3(C10H8N4)]n, shows a three-dimensional poylmeric structure. Each Cu atom is surrounded by five N atoms from three bridging azide ligands and one di-2-pyridyldiazene ligand [Cu—N = 2.002 (5), 2.317 (6), 2.020 (4), 1.995 (5) and 1.985 (3) Å], forming a CuN5 trigonal bipyramid. One μ1,1-azide bridges two Cu atoms and the other two μ1,1-azides bridge pairs of Cu atoms, forming a —Cu—N—Cu—N2— chain. The di-2-pyridyldiazene bridges two Cu atoms of different —Cu—N—Cu—N2— chains, forming a three-dimensional polymeric structure. On the basis of charge equilibrium, the presence of one CuII and one CuI ion are deduced and the two ions are disordered because of the occurrence of only one unique Cu atom in the structure.