Highly sensitive and selective fluorescent sensor for Zn~(2+) /Cu~(2+) and new approach for sensing Cu~(2+) by central metal displacement

摘要

An "off-on" Zn~(2+) and "on-off" Cu~(2+) fluorescent chemosensor C was designed and synthesized. The binding of C and Zn~(2+)/Cu~(2+) is chemically reversible by the addition of EDTA disodium solution; moreover, the fluorescence emission signal of ZnC decreased with the addition of Cu~(2+), demonstrating that ZnC could detect Cu~(2+) via metal displacement.