One dimensional energy transfer in lanthanoid picolinates. Correlation of structure and spectroscopy

被引:60
作者
Sendor, D
Hilder, M
Juestel, T
Junk, PC
Kynast, UH
机构
[1] Monash Univ, Sch Chem, Clayton, Vic 3800, Australia
[2] Fachhsch Muenster, Fachbereich Chem Ingn, D-48565 Steinfurt, Germany
[3] Philips Res Labs, D-52066 Aachen, Germany
关键词
D O I
10.1039/b302499g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Optical and structural properties of rare earth complexes with 2-pyridine carboxylic acid ('Hpic') are evaluated by luminescence spectroscopy, decay measurements, X-ray crystal structure determination, FTIR, DTA and metal content analysis. Corresponding Tb3+ and Eu3+ complexes of this ligand are extraordinarily efficient with respect to their luminescence. In the crystalline state the series is isostructural and composed of M[Ln(pic)(4)].nH(2)O(M=Na, NH4; Ln=Eu, Gd, Tb, Ho) with pic-linked [Ln(pic)(4)](-) units forming a chain-like structure, which gives rise to a one-dimensional exchange communication between the rare earth ions; this energy transfer being confined to the chains. Energy transfer of the Coulomb type between the ligands appears to be of significance only, if suitable rare earth acceptor states are not accessible, as is shown for a series of [La(pic)(4)](-) series, in which La3+ is gradually substituted by Tb3+ or Eu3+.
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页码:1070 / 1077
页数:8
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