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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 5
BKCSDE 31(5)
May 20, 2010

Title	Synthesis and Luminescence Properties of Lanthanide Complexes of a Novel Polyaminopolycarboxylate Ligand
Author	Chang quan Tang, Rui ren Tang*, Chun hua Tang, Zhi wen Zeng
Keywords	Synthesis, Pyridine, Lanthanide complexes, Luminescence
Abstract	A novel polyaminopolycarboxylate ligand with many coordination sites, N,N,N¹,N¹,N²,N²-[( 2,4,6-tri(aminomethyl)- pyridine]hexakis(acetic acid) (TPHA), was designed and synthesized and its lanthanide complexes Na₆Tb₂(TPHA)Cl₆· 14H₂O, Na₆Eu₂(TPHA)Cl₆·8H₂O, Na₆Gd₂(TPHA)Cl₆·11H₂O and Na₆Sm₂(TPHA)Cl₆·9H₂O were successfully prepared. The ligand and the complexes were characterized by elemental analysis, IR, mass, NMR and TG-DTA. The TG-DTA studies indicated that the complexes had a high thermal stability, whose initial decomposition temperature was over 270 °C. The luminescence properties of the complexes in solid state were investigated and the results suggested that Tb³⁺ and Eu³⁺ ions could be sensitized efficiently by the ligand, especially the Tb(III) complex displayed a very strong luminescence intensity (> 10000) and only displayed characteristic metal-centered luminescence. Also, the correlative comparison between the structure of ligand and luminescence properties showed how the number of the coordination atoms of ligand can be a prominent factor in the effectiveness of ligand-to-metal energy transfer.
Page	1283 - 1288
Full Text	PDF

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