Structure, photophysics and magnetism of a europium mixed complex, Eu(HFAA)3bipy.H2O, in the solid state and solution

被引:36
作者
Thompson, L
Legendziewicz, J
Cybinska, J
Pan, L
Brennessel, W
机构
[1] Univ Wroclaw, Inst Chem, PL-50383 Wroclaw, Poland
[2] Univ Minnesota, Dept Chem, Duluth, MN 55812 USA
[3] Univ Minnesota Twin Cities, Minneapolis, MN 55455 USA
关键词
europium beta-diketones; X-ray data; absorption; luminescence; excitation spectra; energy transfer; magnetic susceptibility;
D O I
10.1016/S0925-8388(02)00030-0
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lanthanide beta-diketones were used recently in organic-layered electroluminescence diodes and can also find other optical applications. An important characteristic of these materials can be correlated with donor-acceptor properties of the substituents in ligands. Single crystals of C35H21EuF18N4O7 were obtained. The X-ray diffraction analysis shows the triclinic system and space group P (1) over bar. The europium ion is coordinated by six oxygen atoms of hexafluoroacetylacetone and two nitrogen atoms of the 2,2'-dipyridine molecule. The coordination number of Eu(III) is completed to nine by one water molecule. Besides, one non-coordinated 2,2'-dipyridine is located in the crystal lattice which is disordered over two positions. Absorption, emission and emission excitation spectra at 293, 77 and 4 K, as well as luminescence decay time measurements are used to characterize the title compound in the solid state and in solution. The emission properties are strongly dependent on the energy of the excitation beam and on temperature. Magnetic susceptibility measurements were carried out down to 1.7 K. Correlation of the spectra and magnetic properties with details of the structure of C35H21EuF18N4O7 was studied. These results are compared with previously reported data for related systems. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:312 / 322
页数:11
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