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Issue 12, 2011
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Oxidative cyclization of thiosemicarbazone: an optical and turn-on fluorescent chemodosimeter for Cu(II)

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Abstract

A weakly fluorescent thiosemicabazone (L1H) was found to be a selective optical and “turn-on” fluorescent chemodosimeter for Cu2+ ion in aqueous medium. A significant fluorescence enhancement along with change in color was only observed for Cu2+ ion; among the other tested metal ions (viz.Na+, K+, Mg2+, Ca2+, Cr3+, Zn2+, Cd2+, Hg2+, Pb2+, Ag+, Ni2+, Co2+, Fe3+ and Mn2+). The Cu2+ selectivity resulted from an oxidative cyclization of the weak fluorescent L1H into highly fluorescent rigid 4,5-dihydro-5,5-dimethyl-4-(naphthalen-5-yl)-1,2,4-triazole-3-thione (L2). The signaling mechanism has been confirmed by independent synthesis with detail characterization of L2.

Graphical abstract: Oxidative cyclization of thiosemicarbazone: an optical and turn-on fluorescent chemodosimeter for Cu(ii)

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Publication details

The article was received on 07 Nov 2010, accepted on 12 Jan 2011 and first published on 08 Feb 2011


Article type: Paper
DOI: 10.1039/C0DT01549K
Citation: Dalton Trans., 2011,40, 2837-2843
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    Oxidative cyclization of thiosemicarbazone: an optical and turn-on fluorescent chemodosimeter for Cu(II)

    A. Basu and G. Das, Dalton Trans., 2011, 40, 2837
    DOI: 10.1039/C0DT01549K

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