We report a coumarin-derived fluorescent sensor for Zn(2+) termed CTS. CTS shows excellent binding selectivity for Zn(2+) over competing metal ions due to the transformable ability of CTS, that is the displacement of other metal ions by Zn(2+), which induces transformation of chelation from an amide to an imidic acid tautomeric form.
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Xu et al. (2012) studied this question.
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