稀土铕的双Schiff碱络合物的发光  

Fluorescence of Complexes of Rare Earth Eu (III) with Bis-Schiff Bases

作　　者：尹伟[1] 

机构地区：[1]广东教育学院化学系,广东广州510303

出　　处：《广东教育学院学报》2005年第3期61-66,共6页Journal of Guangdong Education Institute

基　　金：广东教育学院教授博士专项经费资助项目

摘　　要：稀土元素铕与双Schiff碱N,N′-二(亚水杨基)-1,4-二氨基丁烷(L1)、N,N′-二(亚水杨基)-1,5-二氨基戊烷(L3)和双Schiff碱还原产物N,N′-二(水杨基)-1,4-二氨基丁烷(L2)形成配合物的荧光是以配体发光为主.当双Schiff碱和TTA共存于同一配合物时,配体的协同发光效应使得络合物的发光表现为强的Eu3+特征光谱,其最大荧光量子产率为0.21.络合物的能量传递过程主要是由配体的n→π*跃迁吸收辐射能并直接向中心离子转递能量,中心离子被激发至激发态5LJ(J=10,8,7,5),然后无辐射弛豫至5D0,发生5D0→7FJ(J=0,1,2,3,4)的跃迁,发射出Eu3+特征光谱.络合物Eu(Lx)(TTA)(NO3)3(x=1,3)分子发光器件是由络合物中配体的苯环和噻吩环———天线的底座,S、O和N原子———接受光信号的原子天线和中心Eu3+离子———原子信号发射器所组成.The fluorescence of the complexes composed of europium and bis-Schiff bases N, N-bis (salicylidene)-1, 4-diaminobutane (L_1), N, N-bis (salicylidene)-1, 5-diaminopentane (L_3) or N, N-bis (salicyl)-1, 4-diaminobutane (L_2) are mainly luminescence of the ligands under UV radiation. When bis-Schiff base and 2-thenoyltrifluoroacetone (TTA) coexist in a complex, the Eu (L_1)(TTA)(NO_3)_3 EtOH solution possesses a strong fluorescence of europium ion (III) and a maximal quantum yield (0.21), due to the synergy effect of bis-Schiff base and TTA. The mechanism of energy transfer in the complex of Eu (L_x)(TTA)(NO_3)_3 (x=1,3) is as follow: The energy from the ligands of n ~* transfers directly to the central europium ion, thereby the central ion is excited to a state of ~5L_J (J=10,8,7,5), then relaxes to the state of ~5D_0, and the complex eradiates finally the characteristic fluorescence of Eu^(3+) ion, to be attributed to the transitions of ~5D_0~7F_J (J=0,1,2,3,4); the luminescent melecular device of Eu (L_x)(TTA)(NO_3)_3 ( x=1,3) are composed of the antenna bases of phenyl and thiophenyl, the atomic antennae of S, O, and N atoms, and the atomic emission apparatus of the central Eu^(3+) ion.

关 键 词：铕 双SCHIFF碱 紫外光谱 红外光谱 荧光光谱 荧光量子产率 稀土元素 

分 类 号：O641.4[理学—物理化学]