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Title: Electrochemical synthesis and characterization studies of poly[3,3′-dialkylsulfanyl-2,2′-bithiophene] films
Authors: Ng, S.C. 
Miao, P.
Issue Date: 10-Aug-1999
Source: Ng, S.C.,Miao, P. (1999-08-10). Electrochemical synthesis and characterization studies of poly[3,3′-dialkylsulfanyl-2,2′-bithiophene] films. Macromolecules 32 (16) : 5313-5320. ScholarBank@NUS Repository.
Abstract: Of the numerous thiophene derivatives, 3-alkylsulfanylthiophenes (3AST) is one of the few that cannot be readily polymerized electrochemically to afford the corresponding conductive polymer films. We demonstrate in this paper that 3,3′-dialkylsulfanyl-2,2′-bithiophenes are appropriate monomers into polythiophenes incorporating pendant alkylsulfanyl moieties. Facile electrochemical polymerization can be effected by both the potentiostatic and galvatiostatic approach. The resulting polymer films have molecular weighs (Mn) of ca. 3600 and were soluble in common solvents. Characterization by NMR, UVvis spectroscopy, cyclic voltammetry, and X-ray photoelectron spectroscopy are described. The polymers depicted a low-energy π-π* transition despite the high steric effects present in such HH-TT polythiophenes. In direct contrast to poly[3,3′-dialkyl-2,2′-bithiophene]s and poly[3,3′-dialkoxy-2,2′-bithiophene]s, PDASBTs exhibited significant thermochromistic effects. More significantly, the polymer films exhibited facile electrochemical oxidative (p-) and reductive (n-) doping which are of importance in the practical applications of electrically conductive polymers in rechargeable batteries and other electronic devices. © 1999 American Chemical Society.
Source Title: Macromolecules
ISSN: 00249297
Appears in Collections:Staff Publications

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