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In this study, we reported a new fluorescence sensor for chromium (III) ion, dansyl-L-glutamine (1). The sensor displayed a unique selective fluorescence “turn-on” response to Cr 3+ over other common metal ions in water. Notably, 1 still showed a ratiometric response to Cr 3+ in UV–vis absorption spectra. The binding mechanism of 1 to Cr 3+ was further clarified by using NMR...
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