Development of a new, selective, high affinity, fluorescent probe CD222.2, for potassium is described.Coincidentally two related probes, CDFI 8,3, and CTFI 8,4, were prepared and showed selectivity for the cations sodium and calcium, respectively, and possible reasons for these differences are discussed. The bicyclic probe CD222.2, with observed K, values for K + ranging from 1 to 10 mmol dmP3, has potential applications as an extracellular probe for potassium.
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