Crystal Structures and Magnetic Properties of a Set of Uncommon Dihalo-Bridged Oxalamidato Copper(ll) Dimers

Žilić, Dijana and Rakvin, Boris and Milić, Dalibor and Pajić, Damir and Đilović, Ivica and Cametti, Massimo and Džolić, Zoran (2014) Crystal Structures and Magnetic Properties of a Set of Uncommon Dihalo-Bridged Oxalamidato Copper(ll) Dimers. Dalton Transactions, 43. pp. 11877-11887. ISSN 0300-9246

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Abstract

A set of four copper(II) complexes, L^1-X and L^^-X (X = Cl, Br; L^I = N-(L-leucine methyl ester)-N'-((2-pyridin-2-yl)methyl)oxalamide and L^2 = 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 crystal and by SQUID magnetization measurements. X-ray diffraction studies show one-dimensional hydrogen bonded networks of dimeric copper(m-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. ESR and SQUID studies indicate that all complexes exhibit weak antiferromagnetic interactions between the Cu(m paramagnetic centers, with exchange parameter |J| ~ 1 cm^-1. Magneto-structural comparisons among similar dihalo-bridged Cu(II) binuclear complexes are also provided, and a possible correlation has been established.

Item Type: Article
Date: 5 June 2014
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Publisher: The Royal Society of Chemistry
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 15 Jul 2014 15:36
Last Modified: 06 Sep 2017 15:16
URI: http://digre.pmf.unizg.hr/id/eprint/2512

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