G. Barbarella et al., THE DEFORMABILITY OF THE THIOPHENE RING - A KEY TO THE UNDERSTANDING OF THE CONFORMATIONAL PROPERTIES OF OLIGOPHENES AND POLYTHIOPHENES, Advanced materials, 5(11), 1993, pp. 834-838
Oligothiophenes in solution and in the solid state have different conf
ormational properties, as can be concluded from the spectroscopic and
theoretical data and X-ray structure of three di- and tetramethyl alph
a-conjugated quaterthiophenes (see Figure) reported here.