The one-dimensional structure of Cu(dmen)2Pd(CN)4 (dmen is N,N-dimethylethylenediamine)
Abstract:The title compound, catena-poly[[-cyano-1:22C:N-dicyano-12C-bis(N,N-dimethylethylenediamine-22N,N′)palladium(II)copper(II)]--cyano-1:2′2C:N], [CuPd(CN)4(C4H12N2)2]n, consists of infinite quasi-linear chains with all metal positions on centers of symmetry. The paramagnetic [Cu(dmen)2]2+ cations are linked by diamagnetic [Pd(CN)4]2− anions via bridging cyano groups, which occupy trans positions in both cation and anion, giving rise to 2,2-TT-type chains. The coordination polyhedron of the paramagnetic Cu atom is an octahedron exhibiting typical elongation due to the Jahn–Teller effect, with two longer Cu—N([triple-bond]C) bonds in the axial positions [2.5528 (13) Å] and four shorter Cu—Ndmen bonds (dmen is N,N-dimethylethylenediamine) in the equatorial plane [1.9926 (11) and 2.1149 (12) Å]. The Cu—N[triple-bond]C angle is 138.03 (12)°. Neighboring chains form weak N—H…NC hydrogen bonds.
Document Type: Research Article
Publication date: October 1, 2004