Fluorescence response of TICT-active aminostilbenes to copper(II) ions: redox reaction vs ion recognition
Journal
Research on Chemical Intermediates
Journal Volume
39
Journal Issue
1
Pages
19-32
Date Issued
2013
Author(s)
Lin, Cheng-Kai
Abstract
Cu(II)-selective fluorescence enhancement (1, 2, and 4) or fluorescence quenching (3) was observed for aminostilbenes 1-4 in acetonitrile. The fluorescence responses result from efficient Cu(II)-mediated oxidation of 1-4 that forms new fluorescent species rather than from any specific noncovalent interactions. Evidence of redox reactions includes irreversible Cu(II) titration spectra, spectroscopic observation of the radical cations, and isolation of oxidized aminostilbene dimers. These results provide a new method for synthesis of tetrasubstituted tetrahydrofurans and suggest that aminostilbenes with twisted intramolecular charge-transfer activity are potential fluorescence-enhanced Cu(II) chemodosimeters. The role of Cu(II)-mediated redox reactions should be always taken into account in mechanisms for sensing of arylamine-based Cu(II)-selective fluoroionophores. © 2012 Springer Science+Business Media B.V.
Type
journal article