Abstract
Two new conjugated side-chain isolated polythiophene derivatives, PT4TV and PT4TV-C, were designed and synthesized by copolymerization of thiophene unit with thienylene–vinylene (TV) conjugated side chain and unsubstituted terthiophene unit. The difference of the two polymers is an additional carbonyl group on the conjugated TV side chain in PT4TV-C. Compared to previous reported conjugated side chain polythiophenes (CSC-PTs) with concentrated side chains, PT4TV and PT4TV–C showed red-shifted and enhanced π–π* transition absorption of the polymer backbone along with the shoulder peak and steep absorption edge, indicating ordered polymer main chains and well-packed side chains. PT4TV possessed an absorption edge of 663 nm and a HOMO energy level at −5.21 eV. The introducing of electron deficient carbonyl group in PT4TV–C led to 17 nm red-shifted absorption and a down-shifted HOMO energy level at −5.26 eV, but aroused the issue of poorer planarity of the polymer backbone. The more ordered structure in PT4TV...
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