Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/95681
Title: A pyrazolate-bridged cyclic tetranuclear copper(II) complex : synthesis, crystal structure and magnetic properties
Authors: Zhang, Hua
Fu, Degang
Ji, Feng
Wang, Guoxiong
Yu, Kaibe
Yao, Tianyang
Keywords: DRNTU::Science::Chemistry::Inorganic chemistry::Synthesis
Issue Date: 1996
Source: Zhang, H., Fu, D., Ji, F., Wang, G., Yu, K., & Yao, T. (1996). A Pyrazolate-bridged Cyclic Tetranuclear Copper(II) Complex : Synthesis, Crystal Structure and Magnetic Properties. Journal of the Chemical Society, Dalton Transactions, (19), 3799-3803.
Series/Report no.: Journal of the Chemical Society, Dalton Transactions
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.
URI: https://hdl.handle.net/10356/95681
http://hdl.handle.net/10220/8334
DOI: 10.1039/DT9960003799
Schools: School of Materials Science & 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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