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

By Ines Marti, Armando Ferrer, Jorge Escorihuela Fuentes, M. Isabel Burguete and Santiago V. Luis

Abstract

[EN] 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.Financial support from Ministerio de Ciencia e Innovacion (MCIN, CTQ2009-14366-C02-01) and Bancaja-UJI (P1-1B-2009-59) is gratefully acknowledged. I. M. thanks MCINN for a predoctoral fellowship. A. F. thanks Universitat Jaume I for the financial support under the program "Pla de promocio de la investigacio". The authors are grateful to the SCIC of the Universitat Jaume I for the spectroscopic facilities.Marti, I.; Ferrer, A.; Escorihuela Fuentes, J.; Burguete, MI.; Luis, SV. (2012). Copper(II) complexes of bis(amino amide) ligands: effect of changes in the amino acid residue. Dalton Transactions. 41(22):6764-6776. doi:10.1039/c2dt12459aS67646776412

Publisher: 'Royal Society of Chemistry (RSC)'
Year: 2012
DOI identifier: 10.1039/c2dt12459a
OAI identifier: oai:riunet.upv.es:10251/67114
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