Langmuir-Blodgett films of BEDT-TTF derivatives containing hydroxyl groups with long alkyl chains

BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene) derivatives 1 and 2 containing hydroxyl groups with long alkyl chains were synthesized and characterized. Studies with Langmuir-Blodgett (LB) technique indicated that both compounds 1 and 2 were able to form stable monolayers at the air-water interface, but these monolayers were found difficult to be transferred onto solid substrates. Multilayer LB films based on the mixtures of 1 and 2 with arachidic acid (AA), however, could be prepared easily, and the ordered structures of these LB films were confirmed by small angle X-ray diffraction (SAXRD) analysis. The LB films of 1, 2, and their mixtures with AA were oxidized with iodide, and the conductivity of resulting thin films was measured. For comparison, the conductivity of these LB films was also measured before the oxidation with iodide. (C) 2001 Elsevier Science B.V. All rights reserved.