A Novel 3-D Heterobimetallic Cyano-bridged Coordination Polymer Incorporating Ag···Ag Interaction: [Cu(dien)Ag(CN)2]2[Ag2(CN)3][Ag(CN)2]

A three-dimensional cyano-bridged copper(II) complex, [Cu(dien)Ag(CN)2]2[Ag2(CN)3][Ag(CN)2] (1) (dien = diethylenetriamine), has been prepared and characterized by X-ray crystallography. Complex 1 crystallized in the monoclinic space group P21/n with a = 6.988(2), b = 17.615(6), c = 12.564(4) A, β = 90.790(5)°. The crystal consists of cis-[Cu(dien)]2+ units bridged by [Ag(CN)2]— to form a zig-zag chain. The Ag atoms of the free and bridging [Ag(CN)2]— link together to form additional infinite zig-zag chains with short Ag···Ag distances. The presence of Ag···Ag interactions effectively increases the dimensionality from a 1-D chain to a 3-D coordination polymer.