Zinc(II) bis(dipyrromethenate)s as chemosensors for fluorescent detection of amines

It was proposed new highly sensitive «ON-OFF» fluorescent amines trace amounts (1.6x10−6-9.3x10−5 mol/L) sensors in organic media based on binuclear zinc(II) helicates with 2,2′-, 2,3′- and 3,3′- bis(dipyrromethene)s ([Zn2L2]). The results of fluorescence spectral studies of [Zn2L2]in binary mixtures of cyclohexane with amines (pyridine, diethylamine and trimethylamine) were presented. The influence of bis(dipyrromethene) ligands isomerism and electron-donating ability of N-containing co-solvent on the fluorescence quenching efficiency of [Zn2L2] in the presence of amines was discussed. It was determined, that the zinc(II) 3,3′-bis(dipyrromethenate) exhibits the highest fluorescence sensitivity in the amines presence in comparison with 2,3′- and 2,2′-analogs.