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A new π-conjugated organometallic polymer of which framework is in part composed of cobaltacyclopentadienes has been synthesized by a metallacycle formation reaction of CpCo(PPh3)2 with 4,4′-diethynylbiphenyl. The polymer, poly(4,4′-biphenylene 2,5-cobaltacyclopenta-2,4-dienylene) has a strong absorption band around 500 run, and is oxidized at +0.306 V vs. Ag/Ag+ in dichloromethane and reduced at −1.8 V in acetonitrile.
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Ohkubo et al. (1993) studied this question.
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