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| - The Effect of Substituents on Pyridinium Cation Formation on Pt(110)
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| - In a recent paper we found that pyridinium cations (C5H5NH+) form during the coadsorption of pyridine andhydrogen on Pt(110) in UHV. In this paper the coadsorption of hydrogen and 2- or 3-fluoropyridine is examinedwith EELS to see how changes in molecular properties affect the stability of the ions. We find fluoropyridiniumcations (C5H4FNH+) can form when 2-fluoro- or 3-fluoropyridine is adsorbed on a hydrogen precoveredPt(110) surface. However, the ion concentration is much lower with the fluorinated pyridines than with pyridineas expected since the proton affinity of the substituted pyridines is much lower than that of pyridine. Detailedanalysis shows that the trends in the data cannot be explained by simply considering the variations in theproton affinity. Instead it appears that the strength of the pairwise repulsions between adjacent cations on thePt(110) surface plays a key role in the stability of the cations.
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