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Polymorphism of oligothiophenes, especially quaterthiophene (4T)—see previous communication—has also been studied by another group. They report the growth of large single crystals of 4T from the vapor phase and their characterization by single-crystal X-ray diffraction spectroscopy. The Figure shows the shift between two nearest neighbor molecules in the vapor-grown polymorph of 4T necessary for close packing.
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Antolini et al. (1998) studied this question.
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