2,7-Diferrocenyl-3,6-diazaocta-2,6-diene: A highly selective dual fluorescent sensor for Zn2+ and Ag+ and electrochemical sensor for Zn2+

摘要

2,7-Diferrocenyl-3,6-diazaocta-2,6-diene(DFDD), obtained by condensation reaction of acetylferrocene andethylenediamine, exhibits Zn2+ ion-induced enhancement offluorescence intensity and Ag+ion-induced quenching of fluorescence intensity. The Zn2+ ion shiftsthe redox potential of DFDD from +0.660 V ± 0.005 V to + 0.615 ± 0.005 Vas observed by cyclic voltammetry and square wave voltammetry. Ca2+,Mg2+, Mn2+, Fe2+, Co2+, Ni2+,Cu2+, Cd2+, Pb2+ and Hg2+ have verylittle effect on fluorescence intensity of DFDD. These metal ions together withAg+ ion have no effect on the electrochemistry of DFDD. Both,fluorescence and UV-visible spectroscopic data show a 1:1 interaction between DFDDand Zn2+ with binding constant 75 M -1. Theapplicability of DFDD as fluorescence sensor for Zn2+ ion has beenshown in its estimation in commercial tablets.