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Modified dipicolinic acid ligands for sensitization of europium(III) luminescence

Modified dipicolinic acid ligands for sensitization of europium(III) luminescence
Modified dipicolinic acid ligands for sensitization of europium(III) luminescence
The effect of substitution of the 4- and 3,5-position in the pyridine ring of europium(III) pyridine-2,6-dicarboxylate complexes has been investigated with particular emphasis on sensitization of the Eu3+ ion. Sensitization of the Eu3+ 615nm emission was achieved through excitation of the ligands in which the 4-substituent was –H, -OH, and –Cl and the 3,5-position was -H. In these cases the ligand-to-Eu3+ ratio was confirmed as being 3:1. The sensitization was found to increase following substitution of the 4-position in the order Cl > H > OH. This is attributed to energy transfer occurring from the ligands into different Eu3+ intra-atomic energy levels, with spin selection rules governing the efficiency of this process. The Eu3+ luminescence lifetime was measured and found to vary from 1.16 to 2.90ms depending on excitation energy, ligand, and solvent. For the case of the 3,5-dibromo-4-hydroxy derivative no sensitization was observed and a ligand- to-Eu3+ ratio 1:1 was found. The solubility of these complexes in water and their long emission lifetime make them attractive for use as probes in biological systems.
lanthanide luminescence, pyridine europium complexes
0020-1669
1739-1744
George, Michael R.
4534698f-522e-47d1-8f94-a7d852208367
Golden, Christopher A.
4aba9a97-2608-4c85-b24e-9ea106f4c4f8
Grossel, Martin C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Curry, Richard J.
409b626f-f0b9-4b5e-a12c-6f8b87d20ee0
George, Michael R.
4534698f-522e-47d1-8f94-a7d852208367
Golden, Christopher A.
4aba9a97-2608-4c85-b24e-9ea106f4c4f8
Grossel, Martin C.
403bf3ff-6364-44e9-ab46-52d84c6f0d56
Curry, Richard J.
409b626f-f0b9-4b5e-a12c-6f8b87d20ee0

George, Michael R., Golden, Christopher A., Grossel, Martin C. and Curry, Richard J. (2006) Modified dipicolinic acid ligands for sensitization of europium(III) luminescence. Inorganic Chemistry, 45 (4), 1739-1744. (doi:10.1021/ic051461u).

Record type: Article

Abstract

The effect of substitution of the 4- and 3,5-position in the pyridine ring of europium(III) pyridine-2,6-dicarboxylate complexes has been investigated with particular emphasis on sensitization of the Eu3+ ion. Sensitization of the Eu3+ 615nm emission was achieved through excitation of the ligands in which the 4-substituent was –H, -OH, and –Cl and the 3,5-position was -H. In these cases the ligand-to-Eu3+ ratio was confirmed as being 3:1. The sensitization was found to increase following substitution of the 4-position in the order Cl > H > OH. This is attributed to energy transfer occurring from the ligands into different Eu3+ intra-atomic energy levels, with spin selection rules governing the efficiency of this process. The Eu3+ luminescence lifetime was measured and found to vary from 1.16 to 2.90ms depending on excitation energy, ligand, and solvent. For the case of the 3,5-dibromo-4-hydroxy derivative no sensitization was observed and a ligand- to-Eu3+ ratio 1:1 was found. The solubility of these complexes in water and their long emission lifetime make them attractive for use as probes in biological systems.

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Published date: 2006
Keywords: lanthanide luminescence, pyridine europium complexes

Identifiers

Local EPrints ID: 37665
URI: http://eprints.soton.ac.uk/id/eprint/37665
ISSN: 0020-1669
PURE UUID: c7618ff6-b047-4656-9544-a4890762da57
ORCID for Martin C. Grossel: ORCID iD orcid.org/0000-0001-7469-6854

Catalogue record

Date deposited: 26 Mar 2007
Last modified: 26 Nov 2019 02:03

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Contributors

Author: Michael R. George
Author: Christopher A. Golden
Author: Richard J. Curry

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