Abstract
Infrared (IR) external reflection absorption spectroscopy was applied to study the structure and its change associated with iodine doping of a Langmuir−Blodgett (LB) film of a tetrathiafulvalene (TTF) derivative, 1,3-dithiole-4-carboxylic acid-2-(1,3-dithiol-2-ylidene)hexadecyl ester (HDTTF, Figure 1), prepared on a silicon wafer. The incidence angle (φ) dependence of the p- and s-polarized IR external reflection spectra were measured and analyzed by a theoretical calculation of reflection absorbance (Ap and As) as a function of the tilt angle of the transition moment of each IR band with an assumed complex refractive index. The results indicated that the LB film before doping consists of cis and trans structures, which have the CO bonds with cis and trans configurations, respectively, with respect to the neighboring CC bond of the TTF ring. The TTF ring in both structures are almost perpendicular to the substrate surface with the central CC bond parallel to the surface. After iodine doping the LB film co...
Published Version
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