Abstract 2‐Methacrylamido‐3‐arylpropionic acid, where aryl is 1‐naphthyl (M1NpPA), 2‐naphthyl (M2NpPA), or 1‐pyrenyl (M1PyPA), was synthesized. Free radical polymerization gave polymers which were soluble in water at pH > 6. In aqueous solution, poly(M1NpPA) and poly(M2NpPA) exhibited strong excimer fluorescence as a dominant component, whereas poly(M1PvPA) showed weak monomer fluorescence as a main component. Excitation spectra and fluorescence quenching by Tl+ ions suggested that naphthyl groups in poly(M1NpPA) and poly(M2NpPA) interacted so as to form excimer sites, by which migrating excited singlets were trapped, leading to the strong excimer emission. It was suggested, however, that pyrenyl groups in poly(M1PyPA) were sterically so constrained that they could not attain the full‐overlap excimer conformation but could only interact to form self‐quenching sites, to which energy migration occurred, leading to weak fluorescence.
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Morishima et al. (1993) studied this question.
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