A novel approach toward low optical band gap polysquaraines.
[reaction: see text] Polycondensation of 2,5-dialkoxydivinylbenzene-bridged bispyrroles and squaric acid resulted in extensively conjugated polymers with strong near-infrared (NIR) absorption around 800-1000 nm, which is a signature of their low band gap (E(g)). Conjugated polymers with such a strong NIR absorption are rare. One of the synthesized polysquaraines showed a significantly low E(g) of 0.79 eV with an intrinsic conductivity of 5.3 x 10(-4) S/cm.
Ajayaghosh
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Photochemistry Research Unit, Regional Research Laboratory, CSIR, Trivandrum 695 019, India. aajayaghosh@rediffmail.com
Eldo
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