Fluorescent sensing of anions with acridinedione based neutral PET chemosensor

摘要

Newly synthesised fluorescent chemosensor ADDTU contains the thiourea receptor connected to the acridinedione (ADD) fluorophore via a covalent bond, giving rise to a fluorophore-receptor motif. In this fluorescent chemosensor, the anion recognition takes place at the receptor site which result in the concomitant changes in the photophysical properties of a ADD fluorophore by modulation of photoinduced electron transfer (PET) process. The binding ability of these sensor with the anions F-, Cl-, Br-, I-, HSO4-, ClO4-, AcO-, H2PO4- and BF4- (as their tetrabutylammouniurn salts) in acetonitrile were investigated using UV-vis, steady state and time-resolved emission techniques. ADDTU system allows for the selective fluorescent sensing of AcO-, H2PO4- and F-4(-) over other anions in acetonitrile. (c) 2006 Elsevier B.V. All rights reserved.