Exchange coupling across multiple-atom bridges: crystal structure and magnetic properties of a chloranilate bridged dicopper(II) complex
详细信息 查看全文
- 作者：Gallert ; Stefan ; Weyhermü ; ller ; Thomas ; Wieghardt ; Karl ; Chaudhuri ; Phalguni
- 关键词：Copper complexes ; Chloranilate bridged complexes ; Dinuclear complexes ; Exchange interactions ; Crystal structures
- 刊名：Inorganica Chimica Acta
- 出版年：1998
- 出版时间：June 1, 1998
- 年：1998
- 卷：274
- 期：1
- 页码：111-114
- 全文大小：262 K
文摘
A dinuclear copper(II) complex, [L2Cu2(μ-ClA)] (ClO4)2 (1), with a chloranilate dianion (ClA2−) as the bridging ligand and 1,4,7-trimethyl-1,4,7-triazacyclononane (L) as the capping ligands is reported. 1 Crystallizes in the monoclinic space group P21/n with the cell constants a = 9.540(1), b = 13.572(2), c = 13.544(2) Å, β = 96.31(1)°, V = 1743.0(4) Å3 and Z = 2. The structure of the cation in 1 consists of a planar chloranilate unit bridging two five-coordinated square-pyramidal Cu(II) centres and resulting in the intramolecular Cu
Cu separation of 7.679 Å. Variable temperature (4.2-300 K) magnetic susceptibility data yield a moderate antiferromagnetic interaction between the copper centres in 1 with an exchange coupling constant of J = −12.3 cm−1 based on H = −2JS1·S2.
Cu separation of 7.679 Å. Variable temperature (4.2-300 K) magnetic susceptibility data yield a moderate antiferromagnetic interaction between the copper centres in 1 with an exchange coupling constant of J = −12.3 cm−1 based on H = −2JS1·S2.