Hole-transporting glass-forming indolo[3,2-b]carbazole-based diepoxy monomer and polymers

Hole-transporting indolo[3,2-b]carbazole-based diepoxy monomer and polymers are reported. The polymers were prepared by polyaddition reaction of indolo[3,2-b]carbazole diepoxide with aromatic dithiols in the presence of triethylamine. Their number average molecular weights range from 11500 to 14310 and polydispersity indices are in the range of 2.96–3.08. Thermal, optical, photophysical, electrochemical and photoelectrical properties of the title compounds were studied. Both the monomer, 5,11-di-2,3-epoxypropyl-6-pentyl-5,11-dihydroindolo[3,2-b]carbazole and the polymers were found to form glasses with the glass transition temperatures ranging from 37 °C for the monomer to 99 °C for one of the polymers. Time-of-flight hole drift mobilities observed in the solid amorphous films of the monomer exceeded 10−4 cm2 V−1 s−1 at an electric field of 106 V cm−1.