A New Sensitive and Selective Off-On Fluorescent Zn Chemosensor Based on 3,3',5,5'-Tetraphenylsubstituted Dipyrromethene.

3,3',5,5'-Tetraphenyl-2,2'-dipyrromethene was described as a highly sensitive and selective Off-on fluorescent colorimetric chemosensor for Zn based on the chelation-enhanced fluorescence (CHEF) effect. The reaction of dipyrromethene ligand with Zn induces the formation of the [ZnL] complex, which exhibits the increasing fluorescence in 120 fold compared with ligand in the propanol-1/cyclohexane (1:30) binary mixture. The Zn detection limit was 1.