Synthesis, characterization and thermogravimetric study of the complexes [Eu(12-crown-4)•phen2]•X3 (phen=1,10-phenanthroline;: X = F, Cl, Br, SCN, ClO4 and NO3):: Effect of the counter-ion on the thermal degradation profile

被引：3
|
作者：
Belian, MF
Alves, S
de Sá, GF
Silva, WE
de Farias, RF
机构：
[1] Univ Fed Rio Grande Norte, Programa Posgrad Quim, BR-59078970 Natal, RN, Brazil
[2] Univ Fed Pernambuco, Dept Quim Fundamental, BR-50670901 Recife, PE, Brazil
来源：
THERMOCHIMICA ACTA | 2005年 / 437卷 / 1-2期
关键词：
crown ether; thermogravimetry; counter-ion; europium;
D O I：
10.1016/j.tca.2005.06.020
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The complexes [Eu(12-crown-4)-phen(2)]center dot X-3 (phen= 1,10-phenanthroline; X=F, Cl, Br, SCN, ClO4 and NO3) were synthesized and characterized by elemental analysis, UV-vis and IR spectroscopy. A thermogravimetric study was performed to evaluate the effect of the counter-ion on the thermal degradation profile of the [Eu(12-crown-4)center dot phen(2)](+3) complex cation. In general, the 1,10-phenanthroline molecules are the first to be released, showing that the crown ether molecule forms more stable bonds with the +3 cation. The fluorine complex sublimes and thus could be employed as a precursor for preparation of luminescent films. (C) 2005 Elsevier B.V. All rights reserved.
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页码：59 / 61
页数：3
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