Poly[(2,2′-bipyridyl)-μ3-cyanido-di-μ2-cyanido-dicopper(I,II)

Abstract

The title compound, [Cu2(CN)3(C10H8N2)]n, crystallizes as a cyanido-bridged three-dimensional polymeric structure, where there coexist CuI and CuII ions along with μ3- and μ2-bridging cyanide groups. Each CuI ion is coordinated by four C atoms [Cu—C = 1.956 (3)–2.147 (3) Å] from two μ3- and two μ2-cyanide groups in a tetra­hedral environment. The CuII ion is coordinated by two N atoms from the 2,2′-bipyridyl ligand and three N atoms from one μ3- and two μ2-cyanide groups in a square-pyramidal geometry [Cu—N = 1.967 (3)–2.183 (3) Å]. The CuI ions are paired by two C atoms from two cyanide groups into a dinuclear unit with a short CuI⋯CuI distance of 2.5398 (8) Å. Each dinuclear unit links six CuII ions by four μ2- and two μ3-cyanide groups to form a 4,6-connected framework, with CuI⋯CuII separations ranging from 4.864 (4) to 5.252 (4) Å.