Benzopyrazine-fused tetracene derivatives: Thin-film formation at the crystalline mesophase for solution-processed hole transporting devices

► New tetracene derivatives bearing benzopyrazine acceptor and disulfide donor units were synthesized. ► These compounds are low-bandgap materials giving wavelength light absorption property up to 820 nm. ► These compounds showed hole transport property in field-effect transistors. ► Two alkoxy chains on the benzopyrazine unit influences thermal property and film forming ability. ► An octyloxyl derivative has mesophase between ca. 90 and 190 °C, and thin-film formation is possible at the mesophase.