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Surface chemistry of alanine on Ni{111}
Authors:
Richard E. J.
Nicklin
(University of Reading)
,
Alix
Cornish
(University of Reading)
,
Andrey
Shavorskiy
(University of Reading)
,
Silvia
Baldanza
(University of Reading)
,
Karina
Schulte
(Lund University)
,
Zhi
Liu
(Advanced Light Source)
,
Roger A.
Bennett
(University of Reading)
,
Georg
Held
(Diamond Light Source)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
The Journal Of Physical Chemistry C
, VOL 119 (47)
, PAGES 26566 - 26574
State:
Published (Approved)
Published:
November 2015
Abstract: The adsorption of l-alanine on Ni{111} has been studied as a model of enantioselective heterogeneous catalysts. Synchrotron-based X-ray photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy were used to determine the chemical state, bond coordination, and out-of-plane orientation of the molecule on the surface. Alanine adsorbs in anionic and zwitterionic forms between 250 and ≈320 K. NEXAFS spectra exhibit a strong angular dependence of the π* resonance associated with the carboxylate group, which is compatible with two distinct orientations with respect to the surface corresponding to the bidentate and tridentate binding modes. Desorption and decomposition begin together at ≈300 K, with decomposition occurring in a multistep process up to ≈450 K. Comparison with previous studies of amino acid adsorption on metal surfaces shows that this is among the lowest decomposition temperatures found so far and lower than typical temperatures used for hydrogenation reactions where modified Ni catalysts are used.
Journal Keywords: Organic reactions; Adsorption; Layers; X-ray absorption near edge spectroscopy; Binding energy
Subject Areas:
Chemistry
Facility: I-311 at MAXlab Synchrotron Radiation Facility; 9.3.2 at ALS
Added On:
15/12/2015 11:44
Discipline Tags:
Physical Chemistry
Catalysis
Chemistry
Technical Tags: