CONDUCTING LANGMUIR-BLODGETT-FILMS OF HEPTADECYLCARBOXYMETHYL-BEDT-TTF

Surfactant compounds containing the bis(ethylenedithio)tetrathiafulval ene (BEDT-TTF) donor group appeared to be very promising for productio n of highly conducting Langmuir-Blodgett (LB) films. A new donor compo und, i.e, heptadecylcarboxymethyl-BEDT-TTF, is used to increase intera ction of the molecules with water. It possesses donor properties of he xadecyl-BEDT-TTF and contains a strong hydrophilic group which does no t prevent close packing of BEDT-TTF fragments due to its small dimensi ons. As a result, uniform highly conducting LB films of heptadecylcarb oxymethyl-BEDT-TTF are deposited from the water subphase containing Fe Cl3. Conductivity of the films reaches 4 ohm(-1)cm(-1). Electron and s mall-angle X-ray diffraction studies are carried out. Some structure p arameters are determined. Proceeding from these data possible structur e models are proposed and peculiarities of the structure are discussed . The films are sensitive to the effect of electron beam and lose cond uctivity under irradiation. Thus, a desirable insulating pattern can b e created in the conducting material which is important for technologi cal applications.