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Conjugated Copolymers of Vinylene Flanked Naphthalene Diimide
We report the synthesis of a novel
naphthalene diimide (NDI) monomer
containing two (tributylstannyl)vinyl groups. The utility of
this building block is demonstrated by its copolymerization with five
different electron-rich comonomers under Stille conditions. The resulting
high molecular weight polymers show red-shifted optical absorptions
in comparison to the analogous polymers without the vinylene spacer
and a significant increase in the intensity of the low-energy intramolecular
charge transfer band. The polymers all exhibit ambipolar behavior
in bottom-gate, top-contact organic thin-film transistors. The insertion
of a solution-processed barium hydroxide layer between the polymer
and the gold electrode led to unipolar behavior with improved electron
mobilities