Yang Tian-Lin, Qin Wen-Wu
Key Lab of Energy Sources and Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Jun;67(2):568-71. doi: 10.1016/j.saa.2006.06.044. Epub 2006 Aug 18.
A new Schiff base ligand with tripodal structure, N,N',N''-tri-(3-indolemethanal)-triaminotriethylamine (L), and its complex with terbium was synthesized. The complex was characterized by element analysis, IR spectra, mass spectra, thermal analysis and molar conductivity. The terbium ion was found to coordinate to the Schiff base nitrogen atoms and the bridgehead nitrogen atom. The fluorescence properties of the complex in aqueous solutions were studied. Under the excitation of UV light, the complex exhibits characteristic fluorescence of terbium ion. H(+) concentration could strongly enhance the luminescence of terbium complex with L in aqueous solutions. This phenomenon will make the new complex favorable to be used in the fluorescence switches and sensors. The mechanism of the fluorescence enhancement by protonation of the indole nitrogen atoms is due to the suppressed photoinduced electron transfer (PIET) fluorescence quenching when adding acid.
合成了一种具有三脚架结构的新型席夫碱配体N,N',N''-三-(3-吲哚甲醛)-三氨基三乙胺(L)及其与铽的配合物。通过元素分析、红外光谱、质谱、热分析和摩尔电导率对该配合物进行了表征。发现铽离子与席夫碱氮原子和桥头氮原子配位。研究了该配合物在水溶液中的荧光性质。在紫外光激发下，该配合物呈现铽离子的特征荧光。H(+)浓度可强烈增强铽与L在水溶液中配合物的发光。这种现象将使新配合物有利于用于荧光开关和传感器。吲哚氮原子质子化增强荧光的机理是由于加酸时抑制了光诱导电子转移(PIET)荧光猝灭。
