CONDUCTIVE FILMS OF TETRATHIAFULVALENE DICARBOXYLATE CATION RADICALS AND POLY(VINYL ALCOHOL) FORMED BY CASTING

摘要

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 degrees 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 found. A film containing 5 wt.% of 1(+) in PVA had a four-point conductivity 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. [References: 14]