Abstract
The epitaxial growth of ultrathin organic films (alkane thiolates) on single crystalline metal surfaces is investigated via low energy electron diffraction (LEED) with special emphasis on nonane [CH 3(CH 2) 8SH] molecules, vacuum deposited on Au(111) surfaces. As a function of increasing coverage, the unit cells of nonane thiol can be described by c(21×√3) and p(5×√3). In between and without further change in coverage, the p(5×√3) is changed into a c(10×2√3) R30° structure. The structural changes are interpreted as being due to a decrease of tilt angle of the molecules with respect to the surface normal, followed by a rotation of the molecules with respect to the C–C–C plane of the carbon chains.
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