catena-Poly[[[(diethylenetriamine-κ3N,N′,N′′)copper(II)]-μ-cyanido-κ2C:N] perchlorate]

The structure of the title salt, {[Cu(CN)(C4H13N3)]ClO4}n, is composed of copper-containing cations and perchlorate anions. The CuII atom shows a square-pyramidal coordination, with equatorial positions occupied by the cyanide C atom [Cu—C = 1.990 (3) Å] and the N atoms of the diethylenetriamine ligand (average Cu—N = 2.033 Å), while the axial position is occupied by the N atom of a c-glide-related cyanide group. The axial Cu—N distance of 2.340 (3) Å is longer than the equatorial distances, reflecting Jahn–Teller distortion. The CuII cations are linked by the cyanide groups into infinite chains along the c-axis direction. The refinement included a three-component disordered model for the perchlorate ion. Each minor site is stabilized by hydrogen bonds to N—H donors from four surrounding cations, while one O atom of the major perchlorate site forms hydrogen bonds to three of these cations