Unusually sensitive: A chiral sensor based on 1,1′-bi-2-naphthol was prepared, which can provide visual enantioselective discrimination of α-hydroxycarboxylic acids. When the sensor and the acid have matched configurations, an enantioselective precipitation occurs, which is accompanied by a dramatic (over 950-fold) solid-state fluorescence enhancement (see picture).
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Liu et al. (2008) studied this question.
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