Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18485
Title: Template synthesis, crystal structure and luminescent properties of neutral N4O3 tripodal LnIIIL complexes (Ln III = La3+, Eu3+, Gd3+, Tb 3+, Dy3+, Ho3+, Er3+, Tm3+ or Lu3+; H3L = Tris{[3′-(2″- pyridyl)-5′-tert-butyl-2′-hydroxybenzylidene-2-imino]ethyl}amine)
Authors: Wong, WK
Liang, H
Guo, J
Wong, WY
Lo, WK
Li, KF
Cheah, KW
Zhou, Z
Wong, WT 
Issue Date: 2004
Source: European Journal of inorganic chemistry, 2004, no. 4, p. 829-836
Abstract: In the presence of Ln3+ (Ln = La, Eu, Gd, Tb, Dy, Ho, Er, Tm or Lu), tris(2-aminoethyl)amine condensed with three equivalents of 3-(2′-pyridyl)-5-tert-butyl-2-hydroxybenzaldehyde in methanol to give the neutral Schiff-base complex LnIIIL (Ln = La 1, Eu 2, Gd 3, Tb 4, Dy 5, Ho 6, Er 7, Tm 8 and Lu 9; H3L = tris{[3′-(2″-pyridyl) -5′-tert-butyl-2′-hydroxybenzylidene-2-imino]ethyl}amine). The structures of compounds 4-7 were determined by X-ray crystallography. The crystal structure analyses revealed that the Schiff base behaves as a tri-deprotonated heptadentate ligand encapsulating the lanthanide metal ion within the N4O3 cavity, with all the pyridyl groups being pendant. Solution spectroscopic data suggest that the LnIIIL complexes remain intact in methanol and exist as nine-coordinate non-electrolytes with the lanthanide metal ions coordinated to the N 4O3 cavity of the tripodal Schiff base and two solvent molecules. The solution photoluminescent properties of these lanthanide Schiff-base complexes were also examined.
Keywords: Lanthanides
Luminescence
Schiff bases
Tripodal ligands
Publisher: Wiley-VCH
Journal: European journal of inorganic chemistry 
ISSN: 1434-1948
EISSN: 1099-0682
DOI: 10.1002/ejic.200300353
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