摘要
首次合成两种穴醚[2.2](C[2.2] ),α-噻吩甲酰三氟丙酮(HTTA)和稀土铕(Ⅲ)的三元混配配合物:2Eu(TTA)_3·2HTTA·C[2.2](A)和2Eu(TTA)_3·C[2.2](B).与传统的强荧光配合物Eu·(TTA)_3·2H_2O(C)相比,有以下的相对荧光强度比例关系:I(A):I(B):I(C)=13.3:3.7:1,且混配配合物荧光单色性好.配合物的差热热重、红外光谱、Raman光谱和荧光光谱表明,三元配合物分子中共轭效应增强,分子内能量转移效率提高;配合物品体场对称性提高;同时消除了水分子对荧光的猝灭作用,增强了三元混配配合物的荧光强度.
Two kinds of Eu (III) complexes with mixed ligands of a - thenoyltrifluoroacetone(HTTA) andcryptand [2.2] (C[2.2]) were prepared: 2Eu(TTA)3·2HTTA·C[2.2](A) and2Eu·(TTA)3·C[2.2](B). The observed intensity of luminescence of the complexes A and B is 13.3 and 3.7 times respectively greater than that of the complex Eu(TTA)3 2H2O(C)under the same experimental conditions. The enhancement of luminescence intensity is the results of increasing the efficiency of the intermolecular energy transfer and preventing coordinational H2O from quenching luminescence of the rare earth ions by adding of cryptand[2. 2]. The thermal properties and their structural characters of these complexes are also described basing on the results of TG and DTA, as well as the results of FT - IR and FT - Raman spectra.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1997年第2期153-159,共7页
Acta Chimica Sinica
基金
国家自然科学基金资助课题
