Electroactivity of Electrochemically Synthesized Poly(Aniline Boronic Acid) as a Function of pH: Role of Self-Doping
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- 作者：Bhavana A. Deore ; Sarah Hachey ; and Michael S. Freund
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：April 20, 2004
- 年：2004
- 卷：16
- 期：8
- 页码：1427 - 1432
- 全文大小：93K
- 年卷期：v.16,no.8(April 20, 2004)
- ISSN：1520-5002
文摘
The influence of pH on the electrochemical behavior of electropolymerized, self-doped poly(aniline boronic acid) thin films in the presence of <FONT SIZE="-1">D-fructose has been investigated withvoltammetry and potentiometry in phosphate-buffered saline solution. It was found thatthe complexation of boronic acid with D-fructose and subsequent formation of self-dopedpolymer extends the electroactivity of poly(aniline boronic acid) to neutral and alkaline mediain a manner similar to that of other self-doped polyanilines. However, the electroactivityexhibits more complex pH-dependent behavior, suggesting a transition between speciesinvolved in the self-doping process. Results obtained with in situ UV-vis spectroscopy andex situ FTIR spectroscopy in conjunction with 11B and 19F NMR studies of monomeric speciesindicate that the self-doped structure of poly(aniline boronic acid) is pH sensitive and thatthe anionic boronic acid complex involves either fluoride or hydroxide depending on pH.