Abstract
Hexa-peri-hexabenzocoronene (HBC) substituted by six benzothiadiazole (BTZ) units with ethynylene bridges is synthesized as a new donor-acceptor (D-A) motif. The C≡C bridges significantly reduce the dihedral angles between HBC and BTZ, and thus, lead to a planar molecular conformation as predicted by density functional theory calculations. The optoelectronic properties are investigated by UV/Vis absorption and emission spectroscopies with absorption and emission maxima at 424 and 650 nm, respectively, demonstrating the tunable electronic structures of HBC through the attachment of electron-withdrawing BTZ units. Two-dimensional wide-angle X-ray scattering analysis shows that the molecules self-assemble into liquid-crystalline columns with high stability over a wide temperature range. Scanning tunneling microscopy reveals the formation of ordered bilayers of the D-A molecules with star-shaped structures.
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