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Appel M, Frick B, Elbert J, et al. Molecular ring rotation in poly(vinylferrocene). Phys Chem Chem Phys. 2016;18(41):28973-28981doi: 10.1039/c6cp05156a.
Appel, M., Frick, B., Elbert, J., Gallei, M., & Stühn, B. (2016). Molecular ring rotation in poly(vinylferrocene). Physical chemistry chemical physics : PCCP, 18(41), 28973-28981. https://doi.org/10.1039/c6cp05156a
Appel, Markus, et al. "Molecular ring rotation in poly(vinylferrocene)." Physical chemistry chemical physics : PCCP vol. 18,41 (2016): 28973-28981. doi: https://doi.org/10.1039/c6cp05156a
Appel M, Frick B, Elbert J, Gallei M, Stühn B. Molecular ring rotation in poly(vinylferrocene). Phys Chem Chem Phys. 2016 Oct 19;18(41):28973-28981. doi: 10.1039/c6cp05156a. PMID: 27725982.
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Phys Chem Chem Phys. 2016 Oct 19;18(41):28973-28981. doi: 10.1039/c6cp05156a.

Molecular ring rotation in poly(vinylferrocene).

Physical chemistry chemical physics : PCCP

Markus Appel, Bernhard Frick, Johannes Elbert, Markus Gallei, Bernd Stühn

Affiliations

  1. Institute for Condensed Matter Physics, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany. [email protected] and Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France.
  2. Institut Laue-Langevin, 71 Avenue des Martyrs, 38000 Grenoble, France.
  3. Ernst-Berl Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Alarich-Weiss Straße 4, 64287 Darmstadt, Germany.
  4. Institute for Condensed Matter Physics, Technische Universität Darmstadt, Hochschulstraße 8, 64289 Darmstadt, Germany. [email protected].

PMID: 27725982 DOI: 10.1039/c6cp05156a

Abstract

We investigate the ring rotation dynamics in poly(vinylferrocene) (PVFc) using incoherent neutron spectroscopy. PVFc contains ferrocene units laterally attached to a polymer backbone, allowing for one cyclopentadienyl ring of the organometallic sandwich structure of ferrocene to undergo rotational jump diffusion. The barrier of rotation is found to be broadly distributed, but the dynamics can be well described using a rotation rate distribution model which is well known from the description of methyl group rotation in glassy polymers. As necessary information for the analysis of quasielastic scattering data, we measure the static structure factor of the polymer using polarized neutron diffraction. Neutron time-of-flight and backscattering data are then combined and consistently modeled over the large temperature range from 80 K to 350 K yielding an Arrhenius behavior of the jump rate distribution. The mean value of potential barrier distribution is found to be 〈E

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