Abstract
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.
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