Synthesis and Properties of Thienothiophene-Boron for OLED Application

Synthesis of conjugated organic molecules having electronic and optical properties suitable for electrochromic devices (ECD), organic light emitting diode (OLED), organic field effective transistors (OFET), lasers, photodiodes and solar cell applications have gained importance in recent years.^1-3 Based on the previous studies on thienothiophenes (TT),^2,3  new donor-acceptor materials, 4-[5-[bis-(2,4,6-trimethyl-phenyl)-boranyl]-2-(4-diphenylamino-phenyl)-thieno[3,2-b]thiophen-3-yl]-benzonitrile and {4-[5-[bis-(2,4,6-trimethyl-phenyl)-boranyl]-3-(4-fluoro-phenyl)-thieno[3,2-b]thiophen-2-yl]-phenyl}-diphenyl-amine containing π-conjugated system and having electron withdrawing cyano and fluorine groups and acceptor boron⁴ were designed and synthesized. Their electronic and optical properties were investigated. They have been found to be suitable for OLED applications.