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Effect of Heavy Metals on Dynamic and Static Quenching of the Fluorescence of the Host-Guest Inclusion Complex Methyl-β-Cyclodextrin by 2,9-Dimethyl-4,7-Diphenyl-1,10-Phenanthroline in Aqueous Media
Journal of Applied Spectroscopy ( IF 0.7 ) Pub Date : 2021-09-15 , DOI: 10.1007/s10812-021-01248-7
Umit Ay 1
Affiliation  

An inclusion complex was formed with methyl-β-cyclodextrin (Me-β-CD) and the smallest unit of the macrocyclic family of bathocuproine, 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline. With this newly formed fluorescent probe, the quenching effect of heavy metals was investigated. Spectral characterization of the complex was performed by UV-visible and fluorescence spectroscopy techniques. The complex formation constant (Kb), Gibbs free energy (ΔG0), and approximate quenching activation energy (Ea) values were calculated. Lifetime (τ), bimolecular quenching rate constant (kq) values, and diffusion rate constant (kd) calculations were made, and the mechanism of quenching by the effect of heavy metals was clarified.



中文翻译:

重金属对水介质中 2,9-二甲基-4,7-二苯基-1,10-菲咯啉对主客体包合物甲基-β-环糊精荧光动态和静态猝灭的影响

由甲基-β-环糊精 (Me-β-CD) 和浴铜灵大环家族的最小单元 2,9-二甲基-4,7-二苯基-1,10-菲咯啉形成包合物。使用这种新形成的荧光探针,研究了重金属的猝灭效应。通过紫外-可见光和荧光光谱技术对复合物进行光谱表征。计算复合物形成常数 ( K b )、吉布斯自由能 (Δ G 0 ) 和近似淬火活化能 ( E a ) 值。寿命 (τ)、双分子淬灭速率常数 ( k q ) 值和扩散速率常数 ( k d)进行了计算,阐明了重金属作用淬火的机理。

更新日期:2021-09-16
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