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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
Abstract
An inclusion complex was formed with methyl-β-cyclodextrin (Me-β-CD) and the smallest unit of the macrocyclic family of bathocuproine[Ed1], 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.
Keywords
Supporting agencies: We wish to thank Kocaeli University Scientific Research Coordinaton Unit (BAP) (Project No. 2017/010) and our colleagues in the Chemistry Department of Gebze Technical University for their assistance in fluorescence lifetime measurements.
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Review
For citations:
Ay U. 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. Zhurnal Prikladnoii Spektroskopii. 2021;88(4):661-670.
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