A series of oligothiophenes containing difluorodioxocyclopentene-annelated thiophene units was synthesized, and their electronic properties and structures were investigated by spectroscopic and electrochemical measurements and X-ray analyses. The oligothiophenes having the terminal difluorodioxocyclopentene annelations showed n-type semiconducting behavior on FET devices, and the quaterthiophene revealed field-effect electron mobility as high as 1.3 x 10(-2) cm2 V(-1) s(-1).
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Ie et al. (2008) studied this question.
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