A novel fluorescence chemosensor 1 based on (R)‐binaphthyl‐salen can exhibit highly sensitive and selective recognition responses toward Cu2+ by "turn‐off" fluorescence quench type in THF/H2O, and Zn2+ by "turn‐on" fluorescence enhancement type in CHCl3/CH3CN, respectively, suggesting that solvents can dramatically affect the responsive properties of salen‐based chemosensor. In addition, Cu2+ 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 Cu2+ probe based on CD spectra.
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Huang et al. (2012) studied this question.
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