Abstract
Selective detection and identification of toxic analytes such as trace gases hold significant relevance in supramolecular host–guest functional systems. Identification becomes easier when the detection tool is prone to fluorescence enhancement instead of quenching. A judiciously designed substituted naphthopyran derivative was synthesized and its interactions with several amine guests have been investigated. The probe displayed enhancement in fluorescence signal on interaction with ammonia. Based on fluorescence spectroscopy a limit of detection value of 56 nM was witnessed for ammonia. Molecular level interaction analysis performed using 1H NMR spectroscopy indicated ring opening of naphthopyran derivative induced by ammonia. The designed naphthopyran probe might be useful as a tool for portable NH3 sensing.
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