Issue 9, 2008
From the journal:

New Journal of Chemistry

Luminescence from cerium(iii) acetate complexes in aqueous solution: considerations on the nature of carboxylate binding to trivalent lanthanides

M. Emília Azenha,a   Hugh D. Burrows,*a   Sofia M. Fonseca,a   M. Luísa Ramos,a   José Rovisco,a   J. Seixas de Melo,a   Abilio J. F. N. Sobrala  and  Ksenija Kogejb  

* Corresponding authors

a Department of Chemistry, University of Coimbra, Coimbra, Portugal
E-mail: burrows@ci.uc.pt
Fax: +315 239 827703
Tel: +351 239 854482

b Department of Chemistry and Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Aškerčeva 5, SI-1000 Ljubljana, Slovenia

Abstract

The luminescence of cerium(III) has been studied in aqueous solutions in the presence of acetate ion. In contrast to previous reports that cerium(III) carboxylate complexes do not luminesce, a weak emission is observed, which has a similar spectrum to the aquo cerium(III) species but a much shorter lifetime. Results from a variety of studies on complexation of various trivalent lanthanide ions with carboxylates, including NMR spectral and relaxation measurements, molecular mechanics calculations, deuterium isotope effects on Tb(III) luminescence lifetimes, together with literature data strongly suggest that the dominant mode of complexation between carboxylates and trivalent lanthanides involves a weak, predominantly bidentate, binding to the metal cation. We suggest that the observed emission arises from a 1 : 1 cerium acetate species involving such bidentate coordination.

Graphical abstract: Luminescence from cerium(iii) acetate complexes in aqueous solution: considerations on the nature of carboxylate binding to trivalent lanthanides

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Article information

DOI
https://doi.org/10.1039/B800105G
Article type
Paper
Submitted
07 Jan 2008
Accepted
18 Apr 2008
First published
21 May 2008

New J. Chem., 2008,32, 1531-1535

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Luminescence from cerium(III) acetate complexes in aqueous solution: considerations on the nature of carboxylate binding to trivalent lanthanides

M. E. Azenha, H. D. Burrows, S. M. Fonseca, M. L. Ramos, J. Rovisco, J. S. de Melo, A. J. F. N. Sobral and K. Kogej, New J. Chem., 2008, 32, 1531 DOI: 10.1039/B800105G

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