Structural investigation of Au(111)/butylthiolate adsorption phases

Literature Information

Publication Date 2010-02-23
DOI 10.1039/B921281G
Impact Factor 3.676
Authors

A. Chaudhuri, D. C. Jackson, T. J. Lerotholi, Robert G. Jones, T.-L. Lee, B. Detlefs, D. P. Woodruff


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Abstract

The structures of the high-coverage (‘standing-up’) and low-coverage (‘lying-down’) phases of butylthiolate on Au(111) have been investigated by a range of experimental methods. Normal incidence X-ray standing waves, photoelectron diffraction and near-edge X-ray absorption fine structure results all identify the local S headgroup site as atop a surface Au atom in a bulk continuation site for both high- and low-coverage phases. Low energy electron diffraction shows the low-coverage phase to have a (12 × √3)rect. surface mesh with glide-line symmetry (pmg space group), the long dimension of this mesh being approximately four times the length of the butylthiolate molecule. A structural model is proposed for this phase based on two different enantiomers of an Au-adatom–dithiolate species that is consistent with these results and with recent finding for propylthiolate on this surface using low-temperature scanning tunnelling microscopy (O. Voznyy, J. J. Dubowski, J. T. Yates Jr. and P. Maksymovych, J. Am Chem. Soc., 2009, 131, 12989).

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