Poly(1,3-thienyl-squaraine) has been studied by means of semi-empirical and ab initio quantum theories. It has been found to have a very large electron affinity (>9 eV) and thus, would be unstable in the environment. The band gap of the polymer was found to be as low as 0.3-0.6 eV. A distinct transition from a zwitterionic to a quinoidal structure was observed in the progression of increasingly longer oligomers.
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