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Bis(9-hydroxyfluorenyl)-substituted dithienothiophene afforded a crystalline charge-transfer complex with 2,3-dichloro-5,6-dicyanobenzoquinone. The crystal structure was revealed by an X-ray analysis to be composed of a cage-like dimeric unit of the donor molecules which are alligned in a segregated columnar stack.
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Hayashi et al. (1992) studied this question.
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