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A self‐doped oligoaniline with two stable redox couples in a wide pH range
Author(s) -
Yamamoto Kimihisa,
Taneichi Daiki
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(20000101)201:1<6::aid-macp6>3.0.co;2-3
Subject(s) - redox , oligomer , polyaniline , chemistry , protonation , monomer , electron transfer , electrochemistry , polymerization , conductive polymer , photochemistry , polymer chemistry , polymer , inorganic chemistry , electrode , ion , organic chemistry
2,3‐Dicarboxyaniline in its anionic state is oxidatively polymerized in aqueous solution by Na 2 S 2 O 8 as an oxidant to yield oligo(2,3‐dicarboxyaniline) as a novel oligoaniline. XPS analysis reveals that the structure of the resulting oligomer is 61% quinoid and 39% benzenoid with ca. 21% self‐doping degree. The resulting oligoaniline shows two stable redox couples over a wide pH range on the electrode. Both redox processes involve 1 electron transfer with 1 proton transfer in each 2 monomer units, a redox chemistry that is quite distinct from conventional polyaniline. The redox activity of the resulting polymer in pseudo‐neutral conditions is caused by the carboxy group with high density which acts as a proton source for the protonation on the nitrogen atom of the polyaniline chain.