摘要:
Chemosensors 5-7 possessing a quaternary ammonium cation (for electrostatic interactions) and an N-H group(s) (for H-bonding) as recognition sites and an anthracene-9,10-dione as both a chromogenic and fluorescent moiety exhibit absorption and emission changes with fluoride ions only. No significant response to other anions such as Cl-, Br-, I-, NO3-, CH3COO-, HSO4-, H2PO4- and ClO4- is observed. The dual emission at lambda(max) 580 nm (free 5/6) and lambda(max) 510 and 540 nm (5/6 + F-) in chemosensors 5 and 6 enables ratiometric analysis of fluoride ions. (C) 2008 Elsevier Ltd. All rights reserved.