Peculiar crystal structure of a thiophene/phenylene co-oligomer of 2,5-bis(4′-methoxybiphenyl-4-yl)thiophene

The crystal structure of a thiophene/phenylene co-oligomer of 2,5-bis(4'-methoxybiphenyl-4-yl)thiophene has been investigated. The crystals are orthorhombic with space group Cmc2(1). The crystal structure is characterized by that the molecular long axis is rigorously perpendicular to the bottom crystal plane (the bc-plane).