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Surface chemistry of ultrathin films of histidine on gold as probed by high-resolution synchrotron photoemission

MPG-Autoren
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Grunze,  Michael
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Zitation

Zubavichus, Y., Zharnikov, M., Yang, Y., Fuchs, O., Heske, C., Umbach, E., et al. (2004). Surface chemistry of ultrathin films of histidine on gold as probed by high-resolution synchrotron photoemission. The Journal of Physical Chemistry B, 109(2), 884-891. doi:10.1021/jp047626m.


Zitierlink: http://hdl.handle.net/21.11116/0000-0001-ABAF-A
Zusammenfassung
Procedures for the vacuum deposition of thin histidine films on polycrystalline Au(111) and their characterization with high-resolution synchrotron-radiation-based photoelectron spectroscopy are reported. The chemical form of histidine (anionic vs zwitterionic) and the nature of its interactions with the substrate (strong ionic-covalent vs weak van der Waals bonding) in mono- and multilayer films are analyzed. It is shown that water adsorption on a pre-prepared histidine film at 100 K results in protonation of histidine molecules and partial formation of hydroxyl anions. These chemical effects are carefully differentiated from spectral changes associated with radiation damage of the histidine films.