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Molecular Alignments Studied by X-Ray Diffraction Analysis and Optical Properties of Vacuum-Deposited Thin Films of Thiophene–Pyridine Co-Oligomers

An X-ray diffraction study of vacuum-deposited films of thiophene–pyridine co-oligomers on a sapphire substrate indicated a perpendicular or perpendicular-like alignment of the co-oligomers on the surface of the substrate. The UV-vis peak of the vacuum-deposited films shifted to a shorter wavelength from that observed in solutions. The UV-vis data support the notion that the co-oligomer in the vacuum-deposited film assumes a twisted conformation.