Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 58: Poster Session III (Solid/liquid interfaces; Metals; Semiconductors; Oxides and insulators)
O 58.59: Poster
Mittwoch, 28. März 2012, 18:15–21:45, Poster B
Ferrocene ultrathin films on NaCl(100) – a high resolution FTIR study — Birgit Vogt and •Jochen Vogt — Chemisches Institut der Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
Ferrocene (C5H5)−Fe2+(C5H5)−
is a prototype of an organometallic sandwich complex. The thin film
properties of ferrocene are of interest in many respects, e. g. due
to its potential use as a precursor for the deposition of iron or
iron oxide films on surfaces [1]. We report on the preparation of
ultrathin films of ferrocene on the NaCl(100) surface below 30 K and
ultrahigh vacuum conditions. The films were characterized using
polarization fourier transform infrared spectroscopy (PIRS). Upon
cooling the films from 180 K to 25 K, pronounced reversible
frequency shifts and splittings of the distortion modes of the
cyclopentadienyl rings are observed. The bending mode at 818
cm−1 splits into at least six narrow components between 810 and
830 cm−1 with different fractions of absorption in s- and
p-polarization, respectively. These are consistent with different
orientations of the associated dipole moments with respect to the
substrate surface, and a high degree of film crystallinity.
Coadsorption experiments with CO2 reveal that the applied method
of preparation results in ferrocene films which cover 60 to 80
percent of the substrate surface.
A. B. F. Martinson et al., J. Phys. Chem. C 115 (2011), 4333