Fluorescence "turn-on" sensing of carboxylate anions with oligothiophene-based o-(carboxamido)trifluoroacetophenones.

[摘要]：O-(Carboxamido)trifluoroacetophenones contg. ter- or pentathiophene moiety as a fluorophore exhibit fluorescence enhancement upon binding carboxylate anions. Particularly, the terthiophene deriv. shows a large fluorescence enhancement factor (FEF = 120). The enhancement is explained by intramol. H-bonding stabilization of an anion-ionophore adduct, through which a possible quenching process, the n-p* transition from the trifluoroacetophenone moiety, is eliminated.

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