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)

Wai Kwok Wong, Hongze Liang, Jianping Guo, Wai Yeung Wong, Wing Kit Lo, King Fai Li, Kok Wai Cheah, Zhongyuan Zhou, Wing Tak Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

46 Citations (Scopus)

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 N4O3cavity, 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 N4O3cavity of the tripodal Schiff base and two solvent molecules. The solution photoluminescent properties of these lanthanide Schiff-base complexes were also examined. KGaA, 69451 Weinheim, Germany, 2004.
Original languageEnglish
Pages (from-to)829-836
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Issue number4
DOIs
Publication statusPublished - 20 Feb 2004

Keywords

  • Lanthanides
  • Luminescence
  • Schiff bases
  • Tripodal ligands

ASJC Scopus subject areas

  • Inorganic Chemistry

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