Fluorescent Selective Chemosensor for Fluoride Ion with Pyrene Based on Triphenylphosphine

An effective fluorescencechemosensor must convert the event of anion recognition bythe ionophore into an easily monitored and highly sensitivelight signal from the fluorophore. Fluorescent moieties avail-able to the scientist are typically aromatics such as sub-stituted benzenes, anthracenes, naphthalenes, and pyrenes.Pyrenes are a particularly elegant basis for ratiometric basedoptical sensors, where the ra tio of two emission wavelengthscomprised the analytical signal. To date the pyrene excimer/monomer system has been exploited mainly for cationsensingand increasingly for anion sensing.