Naphthalimide modified rhodamine derivative: Ratiometric and selective fluorescent Sensor for Cu~(2+) based on two different approaches

摘要

A new rhodamine-based derivative bearing a 1,8-naphthalimide group (1) was synthesized as a dual-mode Cu~(2+)-selective sensor via the rhodamine ring-opening approach and ratiometric displacement. A colorimetric and "off-on" signal for Cu~(2+) through rhodamine ring opening in 1 and ratiometric fluorescent signal output when Cu~(2+) displaces the bound Zn~(2+) in the 1-Zn~(2+) complex can be observed.