A Highly Sensitive and Selective Fluorescence Chemosensor for Cu²⁺ and Zn²⁺ Based on Solvent Effect

Abstract

Abstract A novel fluorescence chemosensor 1 based on ( R )‐binaphthyl‐salen can exhibit highly sensitive and selective recognition responses toward Cu 2+ by "turn‐off" fluorescence quench type in THF/H 2 O, and Zn 2+ by "turn‐on" fluorescence enhancement type in CHCl 3 /CH 3 CN, respectively, suggesting that solvents can dramatically affect the responsive properties of salen‐based chemosensor. In addition, Cu 2+ can lead to the most pronounced changes of CD spectra without the influence of solvents, which indicates this kind chemosensor can also be used as a sole Cu 2+ probe based on CD spectra.