The coordination chemistry of tartronic acid with copper: magnetic studies of a quasi-equilateral tricopper triangle

Gabriel Pascu; Claire Deville; Sarah E. Clifford; Laure Guenée; Céline Besnard; Karl W. Krämer; Shi-Xia Liu; Silvio Decurtins; Floriana Tuna; Eric J. L. McInnes; Richard E. P. Winpenny; Alan F. Williams

doi:10.1039/C3DT51838H

The coordination chemistry of tartronic acid with copper: magnetic studies of a quasi-equilateral tricopper triangle†

Gabriel Pascu,^a Claire Deville,^a Sarah E. Clifford,^a Laure Guenée,^b Céline Besnard,^b Karl W. Krämer,^c Shi-Xia Liu,^c Silvio Decurtins,^c Floriana Tuna,^d Eric J. L. McInnes,^d Richard E. P. Winpenny^d and Alan F. Williams*^a

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^a Department of Inorganic and Analytical Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH 1211 Geneva 4, Switzerland
E-mail: Alan.Willliams@unige.ch
Fax: +41 22 379 6830
Tel: +41 22 379 6425

^b Laboratory for X-ray Crystallography, University of Geneva, 24 quai Ernest Ansermet, CH 1211 Geneva 4, Switzerland

^c Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland

^d EPSRC National EPR Facility, School of Chemistry and Photon Science Institute, The University of Manchester, Manchester M13 9PL, UK

Abstract

The coordination chemistry of tartronic acid, 1, with copper(II) has been investigated. Structures of two complexes are reported containing respectively the complex [Cu(1–2H)₂Cl]³⁻ where 1 acts as a bidentate ligand through carboxylates, and [Cu₃(1–3H)₃]³⁻ where the alcohol function is deprotonated to bridge two coppers in a triangular trinuclear complex. The latter species undergoes facile oxidation leading to carbon–carbon bond formation. The magnetic and EPR properties of the trinuclear complex have been studied in detail.

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The coordination chemistry of tartronic acid with copper: magnetic studies of a quasi-equilateral tricopper triangle†

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