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Issue 28, 2007
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Hydrothermal syntheses, crystal structures and magnetic properties of two copper(ii) complexes involved in situligand synthesis§

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Abstract

The hydrothermal reaction of Cu(NO3)2, isophthalate (ip) and 2,2′-bipyridine (2,2′-bpy) without or with K2Cr2O7 affords different complexes, whose structures are controlled only by the addition of the K2Cr2O7. The reaction of Cu(NO3)2, isophthalate and 2,2′-bipyridine yields a novel one-dimensional double-chain coordination polymer [Cu3(ip)2(Hipa)2(bpy)2]n (1). However, with the addition of K2Cr2O7 in the above reaction at the same hydrothermal conditions, a discrete hexanuclear Cu(II) complex [Cu6(ipO)4(2,2′-bpy)2(H2O)2]·6H2O (2) (ipOH = 2-hydroxyisophthalate) was isolated. It is interesting to find that the in situ reaction of isophthalate (ip) oxidized to 2-hydroxyisophthalate (ipOH) occurs. K2Cr2O7 acts as an oxidant. The magnetic properties of 1 and 2 have been investigated by variable-temperature magnetic susceptibility and magnetization measurements, and the results reveal that intramolecular ferromagnetic interactions exist with weak intermolecular antiferromagnetic interactions at very low temperature in 1 and weak antiferromagnetic interactions admixture with strong ferromagnetic interactions in 2.

Graphical abstract: Hydrothermal syntheses, crystal structures and magnetic properties of two copper(ii) complexes involved in situ ligand synthesis

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Supplementary files

Article information


Submitted
21 Mar 2007
Accepted
21 May 2007
First published
14 Jun 2007

Dalton Trans., 2007, 3020-3024
Article type
Paper

Hydrothermal syntheses, crystal structures and magnetic properties of two copper(II) complexes involved in situ ligand synthesis

Z. Han, Y. He, C. Ge, J. Ribas and L. Xu, Dalton Trans., 2007, 3020
DOI: 10.1039/B704327A

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