Oxidative homo-coupling of 2,6-bis(tributylstannyl)dithienosiloles afforded poly(dithienosilole-2,6-diyl)s as novel polythiophene derivatives with intrachain silicon bridges, which exhibited red-shifted UV absorption maxima, as compared with those of silole-free polythiophenes.Alternate copolymers also were prepared by cross-coupling reactions of 2,6dibromodithienosiloles with distannylthiophene or bithophene. Applications of the resulting polymers to electroluminescence devices and a field effect transistor were also studied.

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Spirobi(dithienosilole)s were prepared and their optical and FET properties were studied. They showed absorption maxima at 358–368 nm, a little red shifted from those of the corresponding non-spiro type dithienosiloles, indicating that spiro-conjugation operates in these molecules to an extent. The field-effect hole mobility of spirobi[bis(trimethylsilyl)dithienosilole] was determined to be 1.4 × 10−6 cm2 V−1 s−1.

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