Synthesis, characterization, photophysical properties of lanthanide complexes with flexible tripodal carboxylate ligands

Three series lanthanide complexes with the three tripodal amide ligands (L1, L2 and L3) have been synthesized, and one of ligand’s (L3) crystal structure has been determined. The ligand/metal ratios in these complexes are 1:1. The photophysical properties of the complexes indicate more efficient lig...

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Bibliographic Details
Published in:Polyhedron 2013-03, Vol.52, p.939-944
Main Authors: Chan, Chi-Fai, Li, Hongguang, Seto, Chunyu, Tam, Hoi-Lam, Law, Ga-Lai, Wong, Ka-Leung
Format: Article
Language:English
Subjects:
Europium
Lanthanide
Luminescence
Terbium
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Summary:Three series lanthanide complexes with the three tripodal amide ligands (L1, L2 and L3) have been synthesized, and one of ligand’s (L3) crystal structure has been determined. The ligand/metal ratios in these complexes are 1:1. The photophysical properties of the complexes indicate more efficient ligand sensitizations of terbium/europium emission are varied with the triplet state of ligand from the substituent on the benzoate antenna. Three series of lanthanide complexes [LnL1, LnL2 and LnL3 Ln=Eu, Gd and Tb] have been synthesized with tripodal amide ligands. These ligands have similar benzoate antenna with different substituent groups at para-position (L1=–OME, L2=–H; L3=–CF3). The antenna effect is known to play a prominent role in the luminescence of the lanthanide ions emitting in the coordination complexes. The effect of the ligands triplet and antenna effect have been studied here. The room and low temperature photophysical properties of the nine complexes have been monitored in solution with excitation at 330nm. The emission antenna effect (quantum yield and emission intensity) varied with the triplet state of ligand that comes from the substituent on the benzoate antenna.
ISSN:0277-5387
DOI:10.1016/j.poly.2012.07.020