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A new low-bandgap donor–acceptor (D–A) conjugated copolymer poly(DTCDI–POR) of planar acceptor dithienocoronene diimide (DTCDI) and strong donor porphyrin (POR) has been synthesized by Sonogashira coupling polymerization. Poly(DTCDI–POR) exhibits good thermal stability (decomposition temperature of 323 °C), strong absorption (molar extinction coefficient per repeat unit is 1.05 × 10 5 L mol –1 cm –1 at 468 nm in CHCl 3 solution) in visible and near-infrared region (300–900 nm), low bandgap (1.44 eV), and strong two-photon absorption (2PA) at telecommunication wavelengths with 2PA cross sections per repeat unit as high as 7809 GM at 1520 nm.
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Zhou et al. (2012) studied this question.
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