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  • Title: Rosamine-based fluorescent chemosensor for selective detection of silver(I) in an aqueous solution.
    Author: Iyoshi S, Taki M, Yamamoto Y.
    Journal: Inorg Chem; 2008 May 19; 47(10):3946-8. PubMed ID: 18433117.
    Abstract:
    The synthesis and photophysical properties of a rosamine-based fluorescent chemosensor, RosAg, for detecting Ag ion in an aqueous solution are described. This fluorescent sensor has a negligible quantum yield (<0.005) in the absence of Ag(+), whereas a significant increase in fluorescence is observed upon complexation with Ag(+) under physiological conditions. The crystal structure of the silver complex with the chelator moiety of RosAg reveals a trigonal-planar coordination geometry in which three S atoms occupy the metal center. Although a strong coordinative interaction of Ag-N is not observed in the crystal structure, the (1)H NMR experiments suggest that aniline nitrogen is likely to be associated with the Ag(+) center in the solution state. This may inhibit the photoinduced electron transfer process and result in the enhancement of fluorescence.
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