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Issue 22, 2012
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Copper(ii) complexes of bis(amino amide) ligands: effect of changes in the amino acid residue

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Abstract

A family of ligands derived from bis(amino amides) containing aliphatic spacers has been prepared, and their protonation and stability constants for the formation of Cu2+ complexes have been determined potentiometrically. Important differences are associated to both the length of the aliphatic spacer and the nature of the side chains derived from the amino acid. In general, ligands containing aliphatic side chains display higher basicities as well as stability constants with Cu2+. In the same way, basicities and stability constants tend to increase when decreasing the steric hindrance caused by the corresponding side-chain. FT-IR, UV-vis and ESI-MS were used for analyzing the complex species detected in the speciation diagram. UV-vis studies showed the presence of different coordination environments for the copper(II) complexes. Complexes with different stoichiometries can be formed in some instances. This was clearly highlighted with the help of ESI-MS experiments.

Graphical abstract: Copper(ii) complexes of bis(amino amide) ligands: effect of changes in the amino acid residue

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Supplementary files

Article information


Submitted
20 Dec 2011
Accepted
23 Mar 2012
First published
28 Mar 2012

Dalton Trans., 2012,41, 6764-6776
Article type
Paper

Copper(II) complexes of bis(amino amide) ligands: effect of changes in the amino acid residue

I. Martí, A. Ferrer, J. Escorihuela, M. I. Burguete and S. V. Luis, Dalton Trans., 2012, 41, 6764
DOI: 10.1039/C2DT12459A

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