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- W2000232780 abstract "We report the significant effect of the introduction of short alkyl chains on the electrochromic behavior of poly(2-(2-thienyl)-1H-pyrrole), poly(1). Hence, poly(3-ethyl-2-(2-thienyl)-1H-pyrrole), poly(2), and poly(3-n-propyl-2-(2-thienyl)-1H-pyrrole), poly(3), presented multicolor electrochromism (both cathodic and anodic) exhibiting several colors: blue-grayish (+0.8 V), light blue (+0.2 V), light brown (0 V), brown (−0.1 V), dark orange (−0.2 V) and light orange (−0.8 V). Both poly(2) and poly(3) films showed a maximum optical contrast (ΔTmax) of ∼30% at a film thickness <100 nm. For both polymers, the optical responses for the oxidation and reduction process were in the range of a few seconds with a coloration efficiency during the bleaching process of 107−108 cm2/C. The new multichromic polymers were thermally stable up to 200 °C and showed reduced weight loss in the temperature range from 400 to 800 °C. The doping level for poly(2) and poly(3) was in the range of 26−31%. AFM images illustrated that poly(2) presented a much rougher surface than poly(3). The morphology corresponding to the oxidized state for both polymers was sharp, showing a significant smoothening of the surface upon reduction. Geometry optimizations and theoretical conformational analysis performed at the B3LYP/6-311G* level pointed to an increased population of s-cis conformers in 2 and 3 that presumably will be also retained in poly(2) and poly(3)." @default.
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- W2000232780 date "2008-09-12" @default.
- W2000232780 modified "2023-10-06" @default.
- W2000232780 title "Influence of the Introduction of Short Alkyl Chains in Poly(2-(2-Thienyl)-1<i>H</i>-pyrrole) on Its Electrochromic Behavior" @default.
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- W2000232780 doi "https://doi.org/10.1021/ma801190n" @default.
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