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Novel main-chain-conjugated poly(carbazol-alt-squaraine) and poly(dipyridyl-alt-squaraine) were successfully synthesized through direct polycondensation of 9-(2-ethylhexyl)carbazole-bridged or dipyridyl-bridged bispyrrole and squaric acid.The structures and properties of the polymers were characterized using ~1H NMR,FT-IR,UV-vis and cyclic voltammetry.Both polymers exhibit excellent solubility in common organic solvents and good thermal stability.Their UV-vis absorption spectra indicated the polymers have broad and strong spectral responses from 200 nm to 900 nm,which reveals a low optical band gap around 1.38 eV, suggesting that they may be promising candidates for organic solar cells.
Novel main-chain-conjugated poly (carbazol-alt-squaraine) and poly (dipyridyl-alt-squaraine) were synthesized synthesized through direct polycondensation of 9- (2-ethylhexyl) carbazole- bridged or dipyridyl-bridged bispyrrole and squaric acid. structures and properties of the polymers were characterized using ~ 1H NMR, FT-IR, UV-vis and cyclic voltammetry. Both polymers exhibit excellent solubility in common organic solvents and good thermal stability. their UV-vis absorption spectra shows the polymers have broad and strong spectral responses from 200 nm to 900 nm, which reveals a low optical band gap around 1.38 eV, suggesting that they may be promising candidates for organic solar cells.