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)
authors Soares-Santos, PCR; Nogueira, HIS; Rocha, J; Felix, V; Drew, MGB; Ferreira, RAS; Carlos, LD; Trindade, T
nationality International
journal POLYHEDRON
author keywords lanthanide complexes; 2-hydroxynicotinic acid; luminescence; crystal structures
keywords TRANSITION-METAL COMPLEXES; EMISSION QUANTUM YIELDS; PYRIDINECARBOXYLIC ACIDS; 3-HYDROXYPICOLINIC ACID; SPECTROSCOPIC PROPERTIES; SOLUTION EQUILIBRIA; COORDINATION MODES; ENERGY-TRANSFER; NICOTINIC-ACID; ALUMINUM(III)
abstract 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.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0277-5387
year published 2003
volume 22
issue 27
beginning page 3529
ending page 3539
digital object identifier (doi) 10.1016/j.poly.2003.09.018
web of science category Chemistry, Inorganic & Nuclear; Crystallography
subject category Chemistry; Crystallography
unique article identifier WOS:000186678600015
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