A fluorescent sensor for Zn2+ and NO2− based on the rational control of C
N isomerization†
Abstract
A new strategy for the ultrasensitive sensing of cations and anions based on the control of CN isomerization has been developed. Imine-derived ligand L is non-fluorescent due to the C
N isomerization process, whereas its ternary complex with ZnCl2 is moderately fluorescent because of the partial inhibition of C
N isomerization. Such a ternary complex can give a remarkable fluorescence increase when it interacts with nitrite because of the much more efficient suppression of C
N isomerization. This modulation process of C
N isomerization can thus be used for the highly selective detection of Zn2+ and NO2− in an aqueous solution.