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Journal Article

Investigation of the Molecular Motion of Self-Assembled Fatty Acid Films

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Risse,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Hill,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Schmidt,  Jörg
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Abend,  Günter
Fritz Haber Institute, Max Planck Society;

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Hamann,  Heiko
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Risse, T., Hill, T., Schmidt, J., Abend, G., Hamann, H., & Freund, H.-J. (1998). Investigation of the Molecular Motion of Self-Assembled Fatty Acid Films. The Journal of Physical Chemistry B, 102(15), 2668-2676. doi:10.1021/jp972459u.


Cite as: https://hdl.handle.net/21.11116/0000-0007-4F09-8
Abstract
We have investigated self-assembled stearic acid films adsorbed on an Al2O3 film by means of electron paramagnetic resonance (EPR) as well as near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The stearic acid molecules are orientated in the film as shown by the NEXAFS data. Doping of the film with spin-labels in order to make the films accessible to EPR spectroscopy distorts the structure only slightly as long as the concentration of the spin-labels is low. The temperature-dependent EPR spectra reveal a distinct dependence of the onset of the rotational motion of the spin-label with variation of the location of the spin-label along the chain. The analysis of the EPR line shape allows to gain insight into the internal motion of the molecular chain.