Issue 9, 2003

First report of singly phenoxo-bridged copper(ii) dimeric complexes: synthesis, crystal structure and low-temperature magnetic behaviour study

Abstract

Three singly phenoxo-bridged dinuclear Cu(II) complexes [Cu2(L)2(SCN)(H2O)](ClO4) 1, [Cu2(L)2(N3)(H2O)](ClO4) 2, [Cu2(L)2(NCO)(H2O)](ClO4) 3 (HL is the Schiff base ligand derived from O-vanillin and 2-aminomethyl ethylenediamine) have been synthesised and characterised by infrared, UV-Vis spectra, electrochemical study and single crystal X-ray diffraction study. In all the complexes (1–3), there are two geometrically different square pyramidal copper(II) centres, with N3O2 and N2O3 donor sets for the two Cu(II) centres. In the dimeric unit, the copper atoms are held together by only one distinct rare μ2-phenolate oxygen of one Schiff base. The Cu–Cu distances are 3.291(2), 3.244(1) and 3.244(1) Å for complexes 1, 2 and 3, respectively, and the Cu–O–Cu angles are found to be 111.5(1), 109.3(2), 109.6(1)° for complexes 1, 2 and 3, respectively. Variable temperature magnetic susceptibility study on the complexes 1,2 and 3 indicate the presence of antiferromagnetic coupling between the Cu(II) centres with 2J values −109.8, −103.9 and −95.9 cm−1, respectively.

Graphical abstract: First report of singly phenoxo-bridged copper(ii) dimeric complexes: synthesis, crystal structure and low-temperature magnetic behaviour study

Supplementary files

Article information

Article type
Paper
Submitted
03 Jan 2003
Accepted
03 Jun 2003
First published
22 Jul 2003

New J. Chem., 2003,27, 1360-1366

First report of singly phenoxo-bridged copper(II) dimeric complexes: synthesis, crystal structure and low-temperature magnetic behaviour study

C. R. Choudhury, S. K. Dey, R. Karmakar, C. Wu, C. Lu, M. S. El Fallah and S. Mitra, New J. Chem., 2003, 27, 1360 DOI: 10.1039/B300217A

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