A highly selective and instantaneously responsive Schiff base fluorescent sensor for the “turn-off” detection of iron(iii), iron(ii), and copper(ii) ions

A new and tri-responsive fluorescent Schiff base probe (DBAB) has been designed and developed for the recognition of iron(iii) ions (Fe³⁺), iron(ii) ions (Fe²⁺) and copper(ii) ions (Cu²⁺) simultaneously.