Chemical and phase transformations of thiophene at high pressures

Phase transformations of thiophene (C4H4S) and deuterated thiophene (C4D4S) were studied by visual observations and Fourier-transform infrared spectroscopy up to 30 GPa. At room temperature, thiophene freezes at 0.4 GPa and undergoes a solid-to-solid transition around 6 GPa and probably another one...

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Bibliographic Details
Published in:The Journal of chemical physics 1992, Vol.96 (1), p.761-767
Main Authors: PRUZAN, P, CHERVIN, J. C, FORGERIT, J. P
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Physicochemistry of polymers
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Summary:Phase transformations of thiophene (C4H4S) and deuterated thiophene (C4D4S) were studied by visual observations and Fourier-transform infrared spectroscopy up to 30 GPa. At room temperature, thiophene freezes at 0.4 GPa and undergoes a solid-to-solid transition around 6 GPa and probably another one at 20 GPa. It is shown that an irreversible incomplete transition occurs at 16 GPa. The product of the reaction, a white solid, can be recovered at atmospheric pressure. The infrared analysis of the recovered product gives evidence of a polymer formed by coupling between rings derived from thiophene, but with saturated bonds. Physicochemical arguments suggest the formation of a fibrous compound.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.462461