Accessibility navigation


Lanthanide complexes of 2-hydroxynicotinic acid: synthesis, luminescence properties and the crystal structures of [Ln(HnicO)(2)(mu-HnicO)(H2O)] center dot nH(2)O (Ln = Tb, Eu)

Soares-Santos, P.C.R., Nogueira, H.I.S., Rocha, J. , Felix, V., Drew, M.G.B., Ferreira, R.A.S., Carlos, L.D. and Trindade, T. (2003) Lanthanide complexes of 2-hydroxynicotinic acid: synthesis, luminescence properties and the crystal structures of [Ln(HnicO)(2)(mu-HnicO)(H2O)] center dot nH(2)O (Ln = Tb, Eu). Polyhedron, 22 (27). pp. 3529-3539. ISSN 0277-5387

Full text not archived in this repository.

It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing.

To link to this item DOI: 10.1016/j.poly.2003.09.018

Abstract/Summary

New lanthanide complexes of 2-hydroxynicotinic acid (H(2)nicO) [Ln(HnicO)(2)(mu-HnicO)(H2O)] (.) nH(2)O (Ln = Eu, Gd, Tb, Er, Tm) were prepared. The crystal structures of the [Tb(HnicO)(2)(g-HnicO)(H2O)] (.) 1.75H(2)O(1) and [Eu(HniCO)(2)(mu-HnicO)(H2O)] (.) 1.25H(2)O (2) complexes were determined by X-ray diffraction. The 2-hydroxynicotinate ligand coordinates through O,O-chelation to the lanthanide(III) ions as shown by X-ray diffraction and the infrared, Raman and NMR spectroscopy results. Photoluminescence measurements were performed for the Eu(III) and Tb(III) complexes. Lifetimes of 0.592 +/- 0.007 and 0.113 +/- 0.002 ms were determined for the Eu3+ and Tb3+ emitting states D-5(0) and D-5(4), respectively. A value around 30% was found for the D-5(0) quantum efficiency. The energy transfer mechanisms between the lanthanide ions and the ligands are discussed and compared with those observed in similar complexes involving the 3-hydroxypicolinate ligand based on the luminescence of the respective Gd3+-based complexes. (C) 2003 Published by Elsevier Ltd.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11630
Uncontrolled Keywords:lanthanide complexes, 2-hydroxynicotinic acid, luminescence, crystal structures , TRANSITION-METAL COMPLEXES, EMISSION QUANTUM YIELDS, PYRIDINECARBOXYLIC ACIDS, 3-HYDROXYPICOLINIC ACID, SOLUTION EQUILIBRIA, COORDINATION MODES, ENERGY-TRANSFER, NICOTINIC-ACID, ALUMINUM(III), COPPER(II)

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation