Abstract
A new pyrazolate-bridged quasi-hexacopper(II) complex [Cu3(μ3-OH)(μ-pz)3(pzH)3 (μ3-ClO4)]2(μ-ClO4)2 · (CH3OH)0.33 · (C2H5OH)0.66 · H2O (pz = pyrazolate), 1, has been isolated and characterized by single crystal X-ray diffraction, elemental analysis, IR and UV–visible spectra and magnetic susceptibilities. The complex crystallizes in the orthorhombic system, space group Pbca (, No. 61), a = 17.771(4) Å, b = 16.143(4) Å, c = 25.502(6) Å, V = 7316(3) Å3, Z = 8, F(000) = 3521, D c = 1.576 g cm−3. The structure of 1 consists of two [Cu3(μ3-OH)(μ-pz)3(pzH)3(μ3-ClO4)]2+ trimers, which are weakly bridged by two perchlorate ions via centrosymmetric operation to form a trigonal prism with the six Cu atoms at six vertexes. Magnetic measurements were performed in the temperature range 2–300 K. The experimental data above 9 K could be satisfactorily reproduced by using an isotropic exchange model, (1), with parameters of J = −241.91 cm−1, ZJ′ = −23.04 cm−1 and g = 2.07, showing strong antiferromagnetic behaviors in Cu3 unit and weak intertrimer magnetic interaction.
Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 20771084), Tianjin Natural Science Foundation (No. 06YFJMJC12700) and SRF for ROCS, SEM of China.