A terbium complex with long luminescence lifetime for the selective time-gated detection of potassium is presented. The complex demonstrates high sensitivity with a 25-fold increase in time-gated luminescence intensity between 0 and 15 mM potassium. The high selectivity of the complex for potassium over other physiological cations, and especially sodium (93 fold), is likely due to a favorable cation-pi interaction between a phenol moiety and the potassium ion.
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Thibon et al. (2008) studied this question.
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