Dynamic of the fluorescence of the complex Zn++/bis-N- carbazolyl-distyrylbenzene

Evgenia Vaganova, Vladimir Khodorkovsky, Mark Sigalov, Shlomo Yitzchaik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The discrimination between similar concentrations of the different metal ions is one of the important roles of fluorescent sensors. Here we present the study of the fluorescence dynamic of the chromophore bis-N-carbazolyl- distyrylbenzene (BCDSB) in acetonitrile/water (mmol/L), doped with metal ions such as K+; Ca++; Mg++; Zn++(10 μmol/L). BCDSB has the fluorescence with λmax, at 448 nm by excitation at λexc = 378 nm, lifetime 1.089 ns; quantum yield of the fluorescence is 0.68. With continuation of irradiation fluorescence quenching has been registered for all investigated metal ions. However, in the presence of Zn++ oscillation of the intensity was observed. The energy activation of the oscillation as much as 15 kcal/mol was estimated. We believe, that the specificity of the complex Zn++/BCDSB, is in an asymmetrical structure, formed via binding sites of Zn++ with the electron-enriched binding sites of the BCDSB, excited in nπ* state. This asymmetrical complex structure can cause the photoinduced structural fluctuation in the complex coordination. fluorescent sensors; bis-N-carbazolyl-distyrylbenzene; Zn++; oscillating quenching.

Original languageAmerican English
Pages (from-to)235-240
Number of pages6
JournalJournal of Fluorescence
Issue number3
StatePublished - May 2004

Bibliographical note

Funding Information:
This work was supported by the Farkas Center for the Photoinduced Processes. E.V. gratefully acknowledge financial support from the Israel Ministry for Immigrant Absorption.


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