A Schiff base sensor for relay monitoring of In³⁺ and Fe³⁺ through “off–on–off” fluorescent signals

Abstract

A Schiff base <italic>N</italic>′-(3-ethoxy-2-hydroxybenzylidene)-4,5-dihydronaphtho[1,2-<italic>b</italic>]thiophene-2-carbohydrazide (<bold>LB2</bold>) was designed and synthesized and could be used as a sensor to identify In³⁺ and Fe³⁺ through fluorescence ‘off–on–off’ behavior.