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Copper(II) complexes with a flexible oxamato ligand

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Abstract

We report on a convenient synthesis of the ligand precursor, diethylethylene-1,2-bis(oxamate), (Et2H2oeo, 1), and show how a partial and preferential hydrolysis of the ester group can give rise to the dianionic ligand, (H2oeo)2−. Reaction of this ligand with Cu(II) affords the neutral dimeric species, [Cu2(H2oeo)2], which has a low aqueous solubility. We describe the crystal structure of the hydrate Cu2(H2oeo)2(H2O)4 (2) and report magnetic studies that show a weak exchange interaction in the solid. Under more basic conditions and in the presence of Cu(II) ions, we are able to avoid amide cleavage and yet deprotonate the amide group, resulting in the formation of the highly soluble [Cu(Hoeo)2]4− complex anion. The structure of (NBu4)4[Cu(Hoeo)2](H2O)4 (3) is described and compared with the recently reported anhydrous phase.

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Acknowledgments

We are grateful to Kim Wilson for microanalysis, Jim Tweedie for mass spectroscopy measurements and Dr. Mark Murrie for the gift of liquid helium allowing the use of the squid magnetometer. MMB thanks the University of Glasgow for funding.

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  1. Marta Martinez Belmonte

    Present address: ICIQ-Institute of Chemical Research of Catalonia, Av. Paisos Catalans 16, Tarragona, 43007, Spain

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  1. WestCHEM, Department of Chemistry, University of Glasgow, University Avenue, Glasgow, G12 8QQ, UK

    Marta Martinez Belmonte & Daniel J. Price

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  1. Marta Martinez Belmonte
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  2. Daniel J. Price
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Correspondence to Daniel J. Price.

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Belmonte, M.M., Price, D.J. Copper(II) complexes with a flexible oxamato ligand. Transition Met Chem 35, 33–40 (2010). https://doi.org/10.1007/s11243-009-9292-y

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