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          Institute: MPI für Plasmaphysik     Collection: Articles, Books, Inbooks     Display Documents

ID: 112157.0, MPI für Plasmaphysik / Articles, Books, Inbooks
Structural investigation of glycine on Cu(100) and comparison to glycine on Cu(110)
Authors:Kang, J.-H.; Toomes, R. L.; Polcik, M.; Kittel, M.; Hoeft, J.-T.; Efstathiou, V.; Woodruff, D. P.; Bradshaw, A. M.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Issue / Number:13
Start Page:6059
End Page:6071
Copyright:Copyright © 2003 American Institute of Physics
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:New O 1s and N 1s scanned-energy mode photoelectron diffraction (PhD) measurements and low energy electron diffraction observations from the Cu(100)(2×4)pg phase formed by deprotonated glycine, glycinate (NH₂CH₂COO–) have been used to determine the local structure of this adsorbed phase. The favored model involves bonding of both O atoms of the carboxylate and the N atom of the amino group in near atop sites with Cu–N and Cu–O distances of 2.05 Å. This bonding geometry is similar to that of glycinate on Cu(110), but in this case the fact that the C–C backbone is aligned along (100) straggling the more widely spaced Cu atoms rows leads to a larger offset from atop of the O atoms. A reanalysis of O 1s PhD data from the Cu(110)(3×2)pg-glycinate surface shows that the two O atoms are inequivalent, with one O being offset by 0.29 Å more than the other, leading to a twist of the molecule. The results are discussed in the light of other measurements on these surfaces and recent theoretical total energy calculations, in order to obtain models of the long-range ordered phases. These favor models for both surfaces involving only heterochiral structures in which the unit mesh contains one glycinate species with each chirality, defined by the side of the C–C backbone on which the amino group bonds to the surface.
Free Keywords:organic compounds; copper; low energy electron diffraction; photoelectron spectra; adsorbed layers
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/Direktorium
External Affiliations:Physics Department, University of Warwick, Coventry CV4 7AL, United Kingdom; Fritz-Haber-Institut der MPG, Faradayweg 4-6, D14195 Berlin, Germany; Physics Department, University of Warwick, Coventry CV4 7AL, United Kingdom
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