Synthesis, crystal structure and magnetic properties of a trinuclear Cu(II)-pyrazolate complex containing μ3-OH

Author： Zhou Qi-Ji Liu Yan-Zhao Wang Run-Ling Fu Jing-Wei Xu Jing-Yuan Lou Jian-Shi

ISSN： 0095-8972

Source： Journal of Coordination Chemistry, Vol.62, Iss.2, 2009-01, pp. : 311-318

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

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 ( [image omitted], 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, Dc = 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, [image omitted] (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.