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Unconventional Zwitterionic State of L-Cysteine

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Author

Summary, in English

We report the signature of an unconventional zwitterion in thick (>40 angstrom) L-cysteine films grown at low temperature (100 K) by means of sublimation in ultrahigh vacuum. Using X-ray photoelectron spectroscopy (XPS) we find that protonated amino groups (57%) are less prevalent than in films grown at higher temperatures. A large majority of the protonated amino groups receive the hydrogen through deprotonation of the thiol group (45%) and, in contrast, only a small fraction of the carboxylic groups (13%) is deprotonated. This shows, for the first time, the unconventional zwitterion to be the dominant species in L-cysteine. We believe the unusual growth parameters are responsible for this novel observation.

Publishing year

2011

Language

English

Pages

1677-1681

Publication/Series

The Journal of Physical Chemistry Letters

Volume

2

Issue

14

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Sciences
  • Atom and Molecular Physics and Optics
  • Natural Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 1948-7185