THIOPHENE-ALKYLTHIOPHENE COPOLYMERS FROM SUBSTITUTED DIALKYLOLIGOTHIOPHENES

被引:32
作者
HENDERSON, PT [1 ]
COLLARD, DM [1 ]
机构
[1] GEORGIA INST TECHNOL,ATLANTA,GA 30332
关键词
D O I
10.1021/cm00058a019
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Oxidation of a series of dioctyloligothiophenes, in which the terminal thiophene rings are substituted at the S-position, affords mixtures of soluble oligomers and polymers consisting of substituted and unsubstituted thiophene-2,5-diyl repeat units. Polymers derived from these oligomers have conjugation lengths approaching that of 100% head-to-tail PATs and have high electrical conductivities (similar to 40 S cm(-1)). Electrochemical oxidation of low concentrations of oligomers, by cycling to a potential just positive of the onset of oxidation, affords films of the corresponding dimers that are insoluble in acetonitrile but that can be spectroscopically characterized in chlorinated solvents. These dimers are intermediates in the formation of the corresponding polymers. Electrochemical oxidation at high monomer concentrations or at potentials far positive of the oxidation potential affords films containing monomer, dimer, and polymer. Chemical oxidation of dialkylated terthiophene and quarterthiophene affords dimeric and polymeric materials that are useful for comparisons to intermediates formed during electrochemical polymerization. The oligomers and polymers were characterized by NMR, infrared, and visible spectroscopy, cyclic voltammetry, and X-ray diffraction.
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页码:1879 / 1889
页数:11
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