Adsorption of (S)-glutamic acid induces segregation of Ni at bimetallic Au/Ni surfaces

A G Trant, T E Jones, T C Q Noakes, P Bailey, Christopher John Baddeley

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14 Citations (Scopus)


The adsorption of the catalytically important chiral modifier, (S)-glutamic acid, was investigated on bimetallic Ni/Au surfaces created by annealing thin Ni films on Au{111}. Reflection absorption infrared spectroscopy revealed that adsorption of (S)-glutamic acid at room temperature resulted in the immediate formation of pyroglutamate species on Ni-rich surfaces and the non-zwitterionic glutamic acid species on Au-rich bimetallic surfaces. For Au-rich bimetallic surfaces, TPD revealed that pyroglutamate is also formed on annealing. Medium energy ion-scattering studies showed that significant adsorbate-induced Ni segregation was observed on Au-rich bimetallic surfaces – the driving force for segregation is likely to be the formation of nickel pyroglutamate. The implications of our findings for enantioselective catalysis are discussed.
Original languageEnglish
Pages (from-to)300-307
JournalSurface Science
Issue number3-4
Early online date23 Nov 2009
Publication statusPublished - Feb 2010


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