title: Rosamine-based fluorescent chemosensor for selective detection of silver(I) in an aqueous solution.
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.
authors.affiliation: Graduate School of Human & Environmental Studies, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Iyoshi
authors.forename: Masayasu
authors.initials: M
authors.lastname: Taki
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yamamoto
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D012834:Silver / Q000737:chemistry*; D012996:Solutions; D014966:Xanthenes / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D005456:Fluorescent Dyes; D012996:Solutions; D014966:Xanthenes; D012834:Silver