CHARGE TRANSFER FROM TETRATHIAFULVALENE (TTF) TO SILVER AND GOLD SURFACES
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Date
1982
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Publisher
Ohio State University
Abstract
The Raman spectra obtained when the well known organic donor molecule TTF [1] adsorbs onto Ag and Au surfaces clearly indicates that TTF has been oxidized to the radical cation $TTF^{+}$ [2]. On evaporated silver island films the ag, $\upsilon 6$ vibrational mode of $TTF^{+}$ shifts from $488 cm^{-1}$ to $502 cm^{-1}$ as coverage on the surface is increased. This frequency shift, attributed to the formation of $TTF^{+}$ dimers, is in a direction contrary to the shift seen in concentrated solutions of $TTF^{+}$ [2], and implies that the surface severely perturbs the interactions between $TTF^{+}$ molecules. In the monolayer regime a strong band at $432 cm^{-1}$ appears in the Raman spectrum. This new feature can be assigned neither as neutral TTF from multilayers above the adsorbed $TTF^{+}$ nor as TTF in a higher oxidation stage, eg. $TTF^{2+}$. We will discuss possible interpretations of the new $432 cm^{-1}$ feature as well as the results from the Raman study of TTF on Au island films.
Description
$^{1}$Lecture notes in Physics, Series No. 65 (Springer-Verlag, Berlin 1997) ``Organic Conductors and Semiconductors,'' edited by L. Pal, G. Gruner, A. Janossy, and J. Solyom. $^{2}$R. Bozio, I. Zanon, A. Girlando and C. Pecile, J. Chem. Phys. 71, 2282 (1979).