We disclose the development of a ratiometric fluorescent probe based on a benzophosphole P-oxide and its application for the detection of intracellular Na(+) ions. Excitation by visible light induced red emission from this probe in water, which was subjected to a hypsochromic shift upon complexation with Na(+). Based on this change, a ratiometric analysis enabled us to visualise changes in the Na(+) concentration in living mammalian cells.
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Taki et al. (2015) studied this question.
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