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Synthesis and properties of copolymers based on 5,6-dinitrobenzothiadiazole with low band gap and broad absorption spectra

Synthesis and properties of copolymers based on 5,6-dinitrobenzothiadiazole with low band gap and broad absorption spectra,10.1007/s11426-011-4244-8,S

Synthesis and properties of copolymers based on 5,6-dinitrobenzothiadiazole with low band gap and broad absorption spectra  
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One polythiophene derivative PT3T and two low band gap copolymers, PBTT-T3T and PBTT, with different ratios of 5,6-dinitrobenzothiadiazole as the acceptor unit in the polymer backbone have been synthesized by Pd-catalyzed Stille-coupling polymerizations. Thermal stability, X-ray diffraction analyses, UV-vis absorption spectra, photoluminescence spectra and electrochemical properties of the copolymers were investigated. The band gap estimated from UV-vis-NIR spectra of the copolymers films varied from 1.39 to 1.94 eV. Among these copolymers, the films of PBTT-T3T and PBTT, which contain the 5,6-dinitrobenzothiadiazole unit, cover a broad wavelength range in the visible and near-infrared region from 400 to 1000 nm with the maximal peak absorption around 700 nm, which is exactly matched with the maximum in the photon flux of the sun.
Journal: Science China-chemistry - SCI CHINA-CHEM , vol. 54, no. 4, pp. 617-624, 2011
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