Quantcast

Novel examples of high-dimensional mixed-valence copper cyanide complexes.

Research paper by Do-Hyeon DH Kim, Ja-Eung JE Koo, Chang Seop CS Hong, Sangjun S Oh, Youngkyu Y Do

Indexed on: 07 Jun '05Published on: 07 Jun '05Published in: Inorganic Chemistry



Abstract

The first examples of high-dimensional mixed-valence homometallic cyano-bridged copper complexes were synthesized and characterized: net-structured [Cu(CN)(4){Cu(cyclam)}(1.5)](2)(n)()(H(2)O)(5)(n) (1), ladder-type double-chain-structured [Cu(CN)(2){Cu(CN)(2)Cu(cyclam)}](n)()(H(2)O)(n) (2), layer-structured [{Cu(CN)(2)}(2)Cu(cycalm)](n) (3), and hydrogen-bond-based 2-D [Cu(CN)(3)Cu(cyclam)](n)()(CH(3)OH)(n) (4) (cyclam = 1,4,8,11-tetraazacyclotetradecane). (1) Crystallizes in triclinic space group P with a = 8.3589(11) A, b = 13.478(2) A, c = 14.828(2) A, alpha = 66.895(2) degrees , beta = 77.916(3) degrees , gamma = 85.939(3) degrees , and Z = 1; (2) crystallizes in triclinic space group P with a = 8.2305(12) A, b = 9.8861(15) A, c = 13.219(2) A, alpha = 84.863(3) degrees , beta = 75.744(3) degrees , gamma = 89.818(3) degrees , and Z = 2; 3 crystallizes in monoclinic space group P2(1)/c with a = 6.830(2) A, b = 8.482(2) A, c = 17.306(4) A, beta = 98.144(4) degrees , and Z = 2; 4 crystallizes in triclinic space group P with a = 9.470(1) A, b = 10.034(1) A, c = 12.064(1) A, alpha = 67.325(2), beta = 75.593(2), gamma = 70.672(2), and Z = 2. The coordination sphere of Cu(I) sites in the complexes shows diverse structures: tetrahedral [CuC(4)] for (1), tetrahedral [CuC(3)N] and triangular [CuC(2)N] for (2), triangular [CuC(2)N] for (3), and triangular [CuC(3)] for 4. In particular, (1) constitutes the first example of a structurally characterized system containing a bridging tetrahedral [Cu(CN)(4)](3)(-) unit. The diverse structural nature of these complexes is governed by the capping amines and the content of water in the reaction media. The magnetic interactions are negligible in these mixed-valence complexes.