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An oxacalix[4]arene derived dual sensing fluorescent probe for the detection of As(v) and Cr(vi) oxyanions in aqueous media

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Abstract

An oxacalix[4]arene-Ce(III) complex viz. L–Ce(III) has been introduced for the selective detection of As(V) and Cr(VI) oxyanions in aqueous medium. The binding mode of L–Ce(III) + AsO43−/CrO42− was completely investigated with fluorometric titration, time resolve fluorescent decay and FTIR analyses. Photoinduced electron transfer (PET) and chelation-enhanced fluorescence (CHEF) play an important role in the sensing of these oxyanions. The characteristic fluorescence of the L–Ce(III) complex has been quenched by AsO43− and CrO42− through cascading the ligating sites. Cyclic voltammetry (CV) experiments with various scan rates suggest that the electrochemical processes on the electrodes were controlled by diffusion. Both the analytes exhibit a lower limit of detection (LOD) below their standard EPA permissible limits. Moreover, the probe successfully detects the oxyanions in environmental real samples with excellent recovery ranging from 97 to 101%.

Graphical abstract: An oxacalix[4]arene derived dual sensing fluorescent probe for the detection of As(v) and Cr(vi) oxyanions in aqueous media

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Supplementary files

Article information


Submitted
06 Feb 2020
Accepted
06 May 2020
First published
06 May 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

An oxacalix[4]arene derived dual sensing fluorescent probe for the detection of As(V) and Cr(VI) oxyanions in aqueous media

S. Dey, A. Kumar, P. K. Mondal, K. M. Modi, D. Chopra and V. K. Jain, Dalton Trans., 2020, Advance Article , DOI: 10.1039/D0DT00452A

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