A series of m -carborane-based π-conjugated polymers were successfully synthesized via Sonogashira−Hagihara polycondensation reaction. Diiodo- m -carborane monomer underwent efficient polycondensation reaction with both electron-donating and electron-accepting diyne comonomers. The wide-angle structure of m -carborane monomer allowed the preparation of polymers with high molecular weights ( M n = 26 600−36 400 g mol −1 ) and good polymerization degrees (DP = 31−56). UV−vis absorption study in dilute CHCl 3 solution revealed π-conjugation extension of a p -phenylene−ethynylene segment by introducing m -carborane moieties into the polymer backbone. Further, the lack of C−C bond in the carborane cluster leads to polymers exhibiting intense blue emission in solution state (Φ F = 0.11−0.26).
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Kokado et al. (2009) studied this question.
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