Structure of an imidazolate-bridged zinc dimer with tris(2-pyridyl)-methylamine ligand and magnetic properties of its copper dimer analogue

The compound [(tmpa)Zn(im)Zn(tmpa)](ClO 4) 3 [where tmpa is tris(2-pyridyl)-methylamine and im is imidazolate anion] was synthesized, and its crystal structure was determined by X-ray diffraction methods. The structure consists of a dimeric complex bridged by the deprotonated imidazole. The geometry...

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Bibliographic Details
Published in:Polyhedron 1996, Vol.15 (2), p.321-325
Main Authors: Mao Zong-Wan, Hang Qin-Wei, Tang Wen-Xia, Liu Shi-Xiaung, Wang Ze-Min, Huang Jin-Ling
Format: Article
Language:English
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Summary:The compound [(tmpa)Zn(im)Zn(tmpa)](ClO 4) 3 [where tmpa is tris(2-pyridyl)-methylamine and im is imidazolate anion] was synthesized, and its crystal structure was determined by X-ray diffraction methods. The structure consists of a dimeric complex bridged by the deprotonated imidazole. The geometry of the coordination polyhedron around the zinc(II) ions is very near to trigonal bipyramidal. The electronic spectrum indicates the corresponding copper(II) dimer has the same geometrical structure as the zinc(II) dimer. Its ESR powder X-band spectrum shows features typical of an S = 1 system. Variable-temperature (4.2–300 K) magnetic susceptibility data give the antiferromagnetic interaction parameter J = −32.0 cm −1. This behaviour is best accounted for by a super-exchange mechanism involving σ-exchange pathways.
ISSN:0277-5387
DOI:10.1016/0277-5387(95)00185-U