The organometallic polymers having titanacyclopentadiene units in the main chain were prepared by the reaction of diynes and a low-valent titanium complex and they were converted into new p-conjugated polymers possessing various elements-blocks such as 1,4-bismercapto-1,3-diene, 1,4-bisseleno-1,3-diene, thiophene, thiophene-1-oxide, selenophene, tellurophene, phosphole, bismole, and stannole.  Further modifications of the chemical structures of some of the polymers such as 1,4-bismericapto-1,3-diene-containing, tellurophene-containing, and phosphole-containing polymers by oxidation, halogenation, alkylation, and complexation with metals were also performed.  The resulting p-conjugated polymers exhibited a variety of optical and electronic properties, depending on both the nature of the elements-blocks and the building blocks originated from diynes.   That is, the polymers obtained in the present studies exhibited the features of p-type and/or n-type semiconductors depending on the nature of the elements-blocks attached to the p-electron systems.  The narrow band gap materials have successfully been prepared by the facile molecular design of diynes.  Some of the polymers were found to be potentially applicable to photovoltaic cells.

Low band gap p-conjugated polymers containing versatile elements-blocks

247th National Meeting (2014)

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