Yl. Hong et al., CONDUCTIVE FILMS OF TETRATHIAFULVALENE DICARBOXYLATE CATION RADICALS AND POLY(VINYL ALCOHOL) FORMED BY CASTING, Synthetic metals, 68(3), 1995, pp. 281-286
Aqueous solutions of dipotassium tetrathiafulvalene dicarboxylate (1),
potassium ferricyanide and poly(vinyl alcohol) were used to cast air-
stable, flexible and electrically conductive films. Casting at 80-95 d
egrees C formed a network of microcrystals oriented in the film plane.
Spectroscopic studies showed that these crystals contain pi-stacks of
the cation radical 1(+). No evidence for mixed valence stacks was fou
nd. A film containing 5 wt.% of 1(+) in PVA had a four-point conductiv
ity sigma=10(-2) S cm(-1) in the film plane. The structural anisotropy
led to a lower conductivity (10(-4) S cm(-1)) across the plane of the
film.