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Issue 31, 2014

Crystal structures and magnetic properties of a set of dihalo-bridged oxalamidato copper(ii) dimers

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Abstract

A set of four copper(II) complexes, L1–X and L2–X (X = Cl, Br; L1 = N-(L-leucine methyl ester)-N′-((2-pyridin-2-yl)methyl)oxalamide and L2 = N-benzyl-N′-((2-pyridin-2-yl)methyl)oxalamide), have been synthesized and characterized by X-ray structural analysis, electron paramagnetic resonance (EPR) spectroscopy on single crystals and by SQUID magnetization measurements. X-ray diffraction studies show one-dimensional hydrogen bonded networks of dimeric copper(II)-complexes bridged by two halide ions and with the two metal centers 3.44–3.69 Å apart. The geometry at each copper(II) atom is ideal or near ideal square pyramidal. EPR and SQUID studies indicate that all complexes exhibit weak antiferromagnetic interactions between the Cu(II) paramagnetic centers, with exchange parameter |J| ∼ 1 cm−1. Magneto-structural comparisons among similar dihalo-bridged Cu(II) dinuclear complexes are also provided, and a possible correlation has been established.

Graphical abstract: Crystal structures and magnetic properties of a set of dihalo-bridged oxalamidato copper(ii) dimers

Supplementary files

Article information


Submitted
28 Mar 2014
Accepted
30 May 2014
First published
05 Jun 2014

Dalton Trans., 2014,43, 11877-11887
Article type
Paper

Crystal structures and magnetic properties of a set of dihalo-bridged oxalamidato copper(II) dimers

D. Žilić, B. Rakvin, D. Milić, D. Pajić, I. Đilović, M. Cametti and Z. Džolić, Dalton Trans., 2014, 43, 11877 DOI: 10.1039/C4DT00925H

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