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A pyrazolate-bridged cyclic tetranuclear copper(II) complex : synthesis, crystal structure and magnetic properties

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A pyrazolate-bridged cyclic tetranuclear copper(II) complex : synthesis, crystal structure and magnetic properties

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Title: A pyrazolate-bridged cyclic tetranuclear copper(II) complex : synthesis, crystal structure and magnetic properties
Author: Zhang, Hua; Fu, Degang; Ji, Feng; Wang, Guoxiong; Yu, Kaibe; Yao, Tianyang
Copyright year: 1996
Abstract: A new pyrazolate-bridged tetranuclear copper(II) complex [{CuL(H2O)}4]·12H2O (H2L = 5-methoxycarbonylpyrazole-3-carboxylic acid) was synthesized and its crystal structure determined. The molecule has C2 symmetry and consists of four copper atoms bridged by four planar L ligands through the nitrogen atoms of the pyrazole groups to form a (–Cu–N–N–)4 12-membered ring. The co-ordination of each copper is distorted square planar. The basal plane of each copper atom is nearly parallel to a neighbouring pyrazole plane and perpendicular to another neighbouring pyrazole plane. In the crystal there is a hydrogen-bond network between water molecules and carboxylate groups which may control the packing. The magnetic properties of the complex have also been investigated down to 5 K. The fitting of the experimental data using a Heisenberg Hamiltonian shows that the exchange interaction between the copper atoms propagated through the monopyrazolate bridge is antiferromagnetic with J=–12.34 cm^–1. The reason for this small value relative to those in di-µ-pyrazolato-dicopper(II) complexes is discussed.
Subject: DRNTU::Science::Chemistry::Inorganic chemistry::Synthesis.
Type: Journal Article
Series/ Journal Title: Journal of the Chemical Society, Dalton Transactions
School: School of Materials Science and Engineering
Rights: © 1996 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by Journal of the Chemical Society, Dalton Transactions, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: http://dx.doi.org/10.1039/DT9960003799.
Version: Accepted version

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