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 Cu^II 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 Cu^II 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.

[(Triethyl­ene­tetra­mine)copper(II)]-μ-cyanido-κ²N:C-[bis(cyanido-κC)copper(I)]

The title compound, [Cu₂(CN)₃(C₆H₁₈N₄)] or [Cu(trien)(CN)Cu(CN)₂], where trien is triethyl­ene­tetra­mine, is a mixed-valence complex crystallizing as discrete mol­ecules, with Cu^I and Cu^II ions linked by a bridging cyanide group. The Cu^II ion is in a square-pyramidal coordination environment, with the N atoms of the tetra­dentate trien ligand occupying the basal positions and Cu—N bond lengths in the range 2.028 (4)–2.047 (4) Å. An N-bonded cyanide group is in the apical position, with a slightly longer Cu—N bond length of 2.127 (4) Å. The Cu^I ion exhibits a trigonal–planar coordination geometry, bonded to the C atoms of the bridging cyanide group and two terminal cyanide groups with Cu—C bond lengths in the range 1.925 (4)–1.948 (5) Å. In the crystal, hydrogen bonding involving the tertiary N—H groups of the trien ligand and N atoms of symmetry-related terminal cyanide groups links mol­ecules into a ribbon extending in the b-axis direction.