A new soluble, low band-gap polymer, poly(2,3-dihexylthieno[3,4-b]pyrazine)2b, which is dark blue–black in the neutral state and which becomes transparent light yellow when doped has been prepared; it has a doped film conductivity of 3.6 × 10–2 S cm–1 and a band-gap (film) of ca. 0.95 eV making it one of the lowest band-gap polymers prepared to date.
M. Pomerantz, B. Chaloner-Gill, L. O. Harding, J. J. Tseng and W. J. Pomerantz, J. Chem. Soc., Chem. Commun., 1992, 1672 DOI: 10.1039/C39920001672
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