Silole-2,5-diboronic acid derivatives 1 serve as new precursors for silole-based π-conjugated polymers 2. The Suzuki–Miyaura coupling of the diboronic acids with 2,5-bis(bromothienyl)silole affords silole–thiophene alternating copolymers, which have a particularly narrow band gap owing to the effects of the ring silicon atoms.
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Yamaguchi et al. (2000) studied this question.
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