upward

Bithiophene

S Samdal, E J Samuelsen, H V Volden, Molecular conformation of 2,2'-bithiophene determined by gas phase electron diffraction and ab initio calculations, Synthetic Metals 59, 259 (1993)

M Pelletier, F Brisse, Bithiophene at 133 K, Acta Crystallogr C 50, 1942 (1994) – cif