title: Fluorescence-enhanced chemosensor for metal cation detection based on pyridine and carbazole.
abstract: A series of donor-acceptor systems incorporating a carbazole moiety as the donating unit and pyridine moiety as the accepting unit have been designed and synthesized. The spectroscopic and electrochemical behaviors of the carbazole derivatives demonstrate that the carbazole unit interacts with the electron-accepting group through the π-conjugated spacer, thus leading to the intramolecular charge transfer (ICT). The pyridine-substituted carbazole derivatives show significant sensing and coordinating properties toward a wide range of metal cations. Compound S2 exhibits fluorescence enhancement upon association with transition metal cations, and compound V3 shows high selectivity for Cu(2+) among this series of materials. DFT calculations indicate the different association abilities of the dyes and the enhancement of ICT upon addition of the metal cations.
authors.affiliation: Key Laboratory of Organosilicon Chemistry and Material Technology of the Ministry of Education, Hangzhou Normal University , Hangzhou 310012, P. R. China.
authors.forename: Xin Jiang
authors.initials: XJ
authors.lastname: Feng
authors.forename: Pin Zhan
authors.initials: PZ
authors.lastname: Tian
authors.forename: Zheng
authors.initials: Z
authors.lastname: Xu
authors.forename: Shao Fu
authors.initials: SF
authors.lastname: Chen
authors.forename: Man Shing
authors.initials: MS
authors.lastname: Wong