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Combined Experimental and Theoretical Study of Methyl Acetoacetate Adsorption on Ni{100}

DOI: 10.1021/acs.jpcc.8b00204 DOI Help

Authors: Panayiotis Tsaousis (University of Reading; Diamond Light Source) , Jorge Ontaneda (University of Reading) , Luca Bignardi (Elettra - Sincrotrone Trieste) , Roger A. Bennett (University of Reading) , Ricardo Grau-crespo (University of Reading) , Georg Held (University of Reading; Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Physical Chemistry C

State: Published (Approved)
Published: March 2018

Abstract: The enantioselective hydrogenation of methyl acetoacetate (MAA) over modified Ni-based catalysts is a key reaction in the understanding of enantioselective heterogeneous catalysis as it represents the only example of this class of reactions catalyzed by base metals. Yet, there is very little molecular-level information available about the adsorption complex formed by the reactants on Ni surfaces. Here, we report a combined experimental and theoretical study of the adsorption of MAA on the Ni{100} surface. X-ray photoelectron spectroscopy shows that MAA forms stable multilayers at low temperatures, which desorb between 200 and 220 K. At higher temperatures a single chemisorbed layer is formed, which decomposes between 300 and 350 K. Density functional theory modeling predicts an enolate species with bidentate coordination as the most stable chemisorbed species. Comparison of photoelectron spectroscopy and X-ray absorption data with simulations using this adsorption model show good qualitative and quantitative agreement. The molecular plane is tilted with respect to the surface plane by about 50°. This breaking of symmetry provides a mechanism for the enantioselective hydrogenation.

Subject Areas: Chemistry

Facility: Elettra