Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Poster: Polymer Dynamics
CPP 23.5: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Ring Rotation Dynamics of Ferrocene and Ferrocene-containing Polymers — •Markus Appel1,2, Bernhard Frick2, Tinka Spehr1, and Bernd Stühn1 — 1TU Darmstadt (Germany) — 2Institut Laue-Langevin, Grenoble (France)
Ferrocene is an organometallic compound consisting of two cyclopentadienyl rings with a reversibly oxidizable iron atom sandwiched in between. Bulk ferrocene shows a structural phase transition at 164 K (triclinic to monoclinic). Ferrocene-containing polymers are of high interest for applications in nanotechnology as they combine polymeric with metallic properties and can show ferromagnetic susceptibilities.
As an important aspect of the characterization of ferrocene-containing polymers we study the cyclopentadienyl ring rotation dynamics. We aim to compare the ring rotation of bulk ferrocene to ferrocene contained in polymers using inelastic neutron scattering.
Past neutron scattering studies of the ring rotation dynamics in bulk ferrocene mainly focussed on the high temperature phase [1]. We present neutron time-of-flight and backscattering experiments including the new possibility of inelastic fixed window scans (IFWS) on IN16 at the ILL [2] of the low temperature phase of ferrocene. The extracted correlation times and activation energy of the rotation dynamics are found to be considerably higher than for the high temperature phase.
Additionally, we present first measurements on the ferrocene-containing polymer poly(vinylferrocene).
[1] Gardner et al., Chem. Phys. 57, 453 (1981)
[2] Frick et al., Nucl. Inst. and Methods A, accepted for publication