Synthesis, characterization, and OFET characteristics of 3,4-diaryl substituted poly(thienylene vinylene) derivatives

Abstract

Poly(thienylene vinylene) derivatives bearing aryl substituents at 3,4- positions have been synthesized in good yield by Stille- type polycondensation. Two types of aryl substituents, either a 4- octylphenyl or a 5- octyl- 2- thienyl, were investigated in this study. The polymers were characterized by ¹H NMR, GPC, TGA, UV-vis absorption, and photoluminescence spectroscopy. The polymers (P1- P4) showed good to excellent solubility in common organic solvents, and UV-vis absorption spectra in solution exhibit maxima in the range of 511- 595 nm. GPC analysis using PPP standards showed a number average molecular weight range of 6.59- 8.98 × 10³ g mol^-1 for the various polymers. The field effect transistors based on these polymers were studied, and the results obtained are correlated to their molecular structure.