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Issue 8, 2003
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Relationship between ligand structure and electrochemical and relaxometric properties of acyclic poly(aminocarboxylate) complexes of Eu(ii)

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Abstract

A detailed electrochemical study on a series of Eu(III) complexes with multidentate acyclic poly(aminocarboxylate) ligands is reported. For all Eu(III) complexes, a 1e chemically reversible and electrochemically irreversible or quasi-reversible process has been obtained. The electrode kinetics of the 1e reduction of Eu(III) aqua-ion is dependent on the supporting electrolyte as well as on the electrode surface. Pt and glassy carbon electrodes give quasi-reversible responses, whereas mercury shows the better-shaped curves, especially by using sodium p-toluenesulfonate as the supporting electrolyte. Chronoamperometric measurements have been carried out in the temperature range 1–35 °C and the diffusion coefficients of a few Eu(III)/Eu(II) complexes evaluated. The 1/T11H nuclear magnetic relaxation dispersion (NMRD) curves have been measured at 25 °C in aqueous solution for selected Eu(II) complexes, analysed in terms of the standard theory of paramagnetic relaxation and compared with existing data for the isoelectronic Gd(III) derivatives.

Graphical abstract: Relationship between ligand structure and electrochemical and relaxometric properties of acyclic poly(aminocarboxylate) complexes of Eu(ii)

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Supplementary files

Article information


Submitted
20 Nov 2002
Accepted
18 Feb 2003
First published
06 Mar 2003

Dalton Trans., 2003, 1628-1633
Article type
Paper

Relationship between ligand structure and electrochemical and relaxometric properties of acyclic poly(aminocarboxylate) complexes of Eu(II)

M. Botta, M. Ravera, A. Barge, M. Bottaro and D. Osella, Dalton Trans., 2003, 1628
DOI: 10.1039/B211533F

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