Abstract
Sum frequency spectroscopy (SFS) has been used to probe the interface between Pt films and liquid consisting of neat acetonitrile or acetonitrile/solvent mixtures. In the case of the neat acetonitrile, vibrational features associated with C⋮N (2239 cm-1) and C−H stretching (2939 cm-1) from adsorbed acetonitrile were observed. The peaks on Pt were more significantly downshifted from bulk values compared to Al2O3, indicating different adsorption configurations on the surfaces. Significant downshifting of the primary νC⋮N stretch (2239−2229 cm-1) was observed with changing acetonitrile concentration in solution, with alcohols (EtOH and MeOH) causing larger effects than water. In addition, a secondary, downshifted νC⋮N band (2229−2211 cm-1) is observed whose intensity is invariant with liquid-phase concentration, indicating a more strongly bound species. Similar shifts were observed for the CH3 stretching mode of acetonitrile in ethanol, methanol, and water. These frequency shifts in both the C⋮N and C−H stre...
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