β Scribed by Yoshihiro Itoh; Tadao Yasue; Makoto Gouki; Akira Hachimori
No coin nor oath required. For personal study only.
Amphiphilic polyanions containing 2-(9-carbazolyl)ethyl methacrylate and 3-(9-carbazolyl)propyl methacrylamide (r-CzEMA(x) and r-CzPMAm(x), respectively) were prepared and their fluorescence properties were compared with those of various N-vinylcarbazole-containing copolymers (r-VCz(x)). The fluorescence spectra for those former polymers with a higher carbazolyl (Cz) content showed monomeric but diminished emission in aqueous solution, indicating that some excited-state quenching occurred in these polymers. The energy transfer to hydrophobically bound perylene and the fluorescence quenching by fumaric acid (FA), a water-soluble electron acceptor, were facilitated for r-CzPMAm(x) with a higher Cz content when compared to that observed for r-VCz(x). These facts suggest a large effect of the excited-state quenching on the photochemical reactions, as well as providing a contribution of energy migration to such reactions.
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