铋(Ⅲ)-8-羟基喹啉配合物的合成、晶体结构及荧光性质

Synthesis,crystal structure and fluorescence property of bismuth(Ⅲ) complex with 8-hydroxyquinoline

在乙醇体系中,由硝酸铋和8-羟基喹啉(HQ)反应,合成了[Bi(NO_3)Q_2]·H_2O铋(Ⅲ)-8-羟基喹啉配合物.用元素分析、红外光谱、粉末X-射线衍射和单晶X-射线衍射对配合物进行了表征和结构分析.单晶X-射线衍射分析结果表明,该配合物属于单斜晶系,C2/c空间群,a=2.445 04(13)nm,b=0.819 6(4)nm,c=2.071 8(10)nm,β=118.406(5)°,V=3.651 9(3)nm3,Z=8,F(000)=2 192,μ(Mo Kα)=9.698 mm-1.测定了配体、标题配合物及铕掺杂(摩尔分数:5%,10%,15%,20%)配合物的荧光光谱,结果表明,无论是标题配合物还是铕掺杂的配合物均显示配体的荧光,既没有铋离子的特征发射,也没有铕离子的特征发射.说明配合物的荧光是配体的荧光;而配合物的荧光强度大于配体,说明金属离子对配体的荧光有敏化作用.

A novel bismuth （ Ⅲ ） complex of [ Bi （ NO3 ） Q2 ] ·H2O（ HQ = 8-hydroxyquinoline） was synthesized in ethanol and characterized by elemental analysis, IR spectra, PXRD. Its crystal structure was determined by single X-ray diffraction. The complex was crystallized in monoclinic system with space group C2/c, cell parameters of a = 2.44504（13） nm, b = 0.8196（4） nm, c = 2.0718（10） nm, β = 118.406（5）°, V = 3. 651 9 （3） nm^3, number of molecules inside the cell： Z = 8, number of electrons： F（000） = 2 192, absorptive parameter：μ（ Mo Kα） = 9. 698 mm^-1. The emission spectra of complex doped with Eu^3＋ （5%, 10%, 15%, 20%, molar fraction ） instead of Bi^3＋ were also investigated under the 470 nm excitation. The results showed that a luminescence emission peak of the ligand was observed at 570 nm, without the characteristic emission of Bi^3＋ and Eu^3＋. It indicated that the central metal could sensitize the ligand.