Phase transition of tetrakis(octylthio)tetrathiafulvalene (TTC8–TTF) and crystal structure analysis
- 1 January 1991
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 1 (1) , 37-41
- https://doi.org/10.1039/jm9910100037
Abstract
Tetrakis(octylthio)tetrathiafulvalene (TTC8–TTF) crystallizes into two different phases (Forms I and II). Form I undergoes a slightly endothermic, phase transition at ca. 33 °C with a steep increase in the resistivity and a decrease in the drift mobility. Powder X-ray diffraction confirms that this transition is the result of a structural transformation from Form I to Form II. The microscopic origin of the phase transition is ascribed to a subtle repulsive motion in the nearest-neighbour octyl chains which results in the decrease in the transfer integrals between the neighbouring π-electron moieties of TTC8–TTF molecules within a segregated column.Keywords
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