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Novel copper complexes based on the thiocyanate bridge - Synthesis, X-ray studies and magnetic properties |
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| Authors: | B Machura A ?witlickaI Nawrot J Mroziński |
| Institution: | a Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland b Faculty of Chemistry, Wroclaw University, F. Joliot-Curie 14 St., 50-383 Wroc?aw, Poland c Department of X-ray Crystallography and Crystal Chemistry, Institute of General and Ecological Chemistry, Lodz University of Technology, 116 ?eromski St., 90-924 ?ód?, Poland |
| Abstract: | Three novel compounds {Cu(bpzm)(SCN)]Cu(bpzm)(MeOH)]Cu(SCN)4]}n (1a), {Cu2(bpzm)2(μ-SCN)(SCN)3]}n (1b) and Cu2(μ-SCN)2(SCN)2(dpa)2] (2) have been obtained in one-step self-assembly reaction of copper dichloride, a suitable N-N ligand (bis(pyrazol-1-yl)methane and 2,2′-dipyridylamine) and ammonium thiocyanate. For the reaction involving bis(pyrazol-1-yl)methane, an unprecedented in situ reduction of some Cu(II) ions to Cu(I) has been observed. The compound {Cu(bpzm)(SCN)]Cu(bpzm)(MeOH)]Cu(SCN)4]}n (1a) belongs to a relatively scarce group of mixed-valence CuII/CuI coordination polymers with interesting polymeric architecture. It creates infinite two-dimensional structure consisting of layers extending along crystallographic plane (0 0 1), in which the cations CuII(bpzm)(SCN)]+ and CuII(bpzm)(MeOH)]2+ are connected by ions CuI(SCN)4]3− through single end-to-end thiocyanato bridges. Structure 1b consists two crystallographically independent chains. The chain A has a zig-zag form and extends along the crystallographic direction 0 0 1], whereas the second chain is linear and runs along the crystallographic direction 0 1 0]. The structure 2 consists of dinuclear Cu2(dpa)2(μ-SCN)2(SCN)2] units. Variable-temperature magnetic susceptibility measurements show very weak antiferromagnetic interactions between the paramagnetic centres Cu(II) centers inside the crystal lattices of three novel compounds. |
| Keywords: | Coordination polymer Copper Thiocyanate bridge X-ray Magnetic measurements |
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