Study on the luminescence behavior of lanthanide ions using luminol as probe

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• 作者：Yun Zhang ; Zhenghua Song ; ^{songzhenghua@hotmail.com} ; ^{zhsong@nwu.edu.cn} ; Faxin Dong
• 关键词：Lanthanide ions ; Luminol ; Luminescence behavior ; Modeling
• 刊名：Journal of Luminescence
• 出版年：2012
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：September, 2012
• 卷：132
• 期：9
• 页码：2462-2467
• 文件大小：486 K

摘要

Using luminol as the probe, the luminescence behavior of trivalent lanthanide ions (Ln³⁺=La³⁺, Ce³⁺, Pr³⁺, Nd³⁺, Sm³⁺, Eu³⁺, Gd³⁺, Tb³⁺, Dy³⁺, Ho³⁺, Er³⁺, Tm³⁺, Yb³⁺ and Lu³⁺) in aqueous solution was first investigated by fluorescence, and the sensitivity enhanced by 3-5 orders of magnitude compared with the Ln³⁺ intrinsic fluorescence. It was found that Ln³⁺ with luminol could form a 1:1 association complex which remarkably enhanced the fluorescence signal of luminol. The increment of fluorescence intensity was proportional to the concentration of Ln³⁺ in the range of 1.0-70.0 nmol L^鈭?, and the linear correlation equation, 螖I_F=AC_Ln+B, was given. The relationships of A (defined as sensitivity factor) with some physical parameters (atomic number Z, ionic radius 纬_卤, standard redox potential E^o and hydration enthalpy 螖H_hyd) were discussed. The good symmetry of A vs. Z plot for light lanthanides (LLG) and the heavy lanthanides (HLG) and linear relations of A with Z, 纬_卤, E^o and 螖H_hyd should originate in the special features of Ln³⁺ electronic configurations [Xe]4fⁿ (n=0-14). Using the proposed model of Ln³⁺-luminol interaction, lg[螖I_F/(I_Fo-螖I_F)]=rlg[Ln]+lg k, the association constant k was obtained over the range of 1.95脳10⁶-2.63脳10⁷ L mol^鈭?.