Summary
Polysquaraines and polycroconaines have been synthesized. They form a new class of polymers with a small band gap, down to 0.5 eV. The small gap arises from the regular alternation of strong donor and acceptor-like moieties in a conjugated backbone.
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Havinga, E.E., ten Hoeve, W. & Wynberg, H. A new class of small band gap organic polymer conductors. Polymer Bulletin 29, 119–126 (1992). https://doi.org/10.1007/BF00558045
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DOI: https://doi.org/10.1007/BF00558045