Synthesis and magnetic properties of trinuclear chromium(III)palladium(II)-chromium(III) complexes bridged by extended dioximato groups |
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Authors: | Si-Wei Zhang Dai-Zheng Liao Zong-Hui Jiang Geng-Lin Wang |
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Institution: | (1) Department of Chemistry, Nankai University, 300071 Tianjin, P. R. China;(2) State Key Laboratory of Coordination Chemistry, N anfing University, 210008 Nanjing, P. R. China |
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Abstract: | Summary Heterotrinuclear CrIII-PdII-CrIII complexes of formulae Cr(salen)-Pd(dmg)2-Cr(salen)]·H2O (1), Cr(salen)-Pd( -BD) 2-Cr(salen)]·H2O (2) and Cr(salen)-Pd( -FD) 2-Cr(salen)]·2H2O (3) dmg2- =dimethyl-glyoximato, ( -BD)2/2- = -benzyldioximato, ( -FD)2/2- = -furildioximato and salen2– = N,N -ethylenebis(salicylideneiminate)] have been prepared and characterized by elemental analysis, i.r. and electronic spectroscopies, and molar conductances. These complexes are thought to contain extended diomixato bridges. The magnetic properties of complex (1) has been investigated over the 80–300 K range and corresponds to what is expected for an antiferromagnetic CrIII-CrIIIi pair with S
Cr = 3/2 and S
Pd = 0 (Pd2+ is a diamagnetic in a square-planar environment) local spins. The exchange integral (J) was evaluated as -3.38cm–1 using the spin Hamiltonians = -2J
A
B(S
A = S
B = 3/2). |
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Keywords: | |
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