Surface chemistry of alanine on Ni{111}

Nicklin, R. E. J., Cornish, A., Shavorskiy, A., Baldanza, S., Schulte, K., Liu, Z., Bennett, R. A. ORCID: https://orcid.org/0000-0001-6266-3510 and Held, G. (2015) Surface chemistry of alanine on Ni{111}. Journal of Physical Chemistry C, 119 (47). pp. 26566-26574. ISSN 1932-7447 doi: 10.1021/acs.jpcc.5b08814

Abstract/Summary

The adsorption of L-alanine on Ni{111} has been studied as a 10 model of enantioselective heterogeneous catalysts. Synchrotron-based X-ray 11 photoelectron spectroscopy and near-edge X-ray absorption fine structure 12 (NEXAFS) spectroscopy were used to determine the chemical state, bond 13 coordination, and out-of-plane orientation of the molecule on the surface. 14 Alanine adsorbs in anionic and zwitterionic forms between 250 and ≈320 K. 15 NEXAFS spectra exhibit a strong angular dependence of the π* resonance 16 associated with the carboxylate group, which is compatible with two distinct 17 orientations with respect to the surface corresponding to the bidentate and 18 tridentate binding modes. Desorption and decomposition begin together at 19 ≈300 K, with decomposition occurring in a multistep process up to ≈450 K. Comparison with previous studies of amino acid 20 adsorption on metal surfaces shows that this is among the lowest decomposition temperatures found so far and lower than typical 21 temperatures used for hydrogenation reactions where modified Ni catalysts are used.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/46747
Identification Number/DOI	10.1021/acs.jpcc.5b08814
Refereed	Yes
Divisions	Interdisciplinary centres and themes > Chemical Analysis Facility (CAF) Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Publisher	American Chemical Society
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