The surface enhanced Raman spectrum of 2,6-lutidine

The surface enhanced Raman spectrum of 2,6-lutidine adsorbed on a polycrystalline Ag surface is reported along with a discussion of the effect on the methyl vibrations of adsorption on the electrode. The observation of an AgN stretch and small shifts of the methyl vibrations on the surface lead to a model of the molecule-surface interaction. If the molecule is adsorbed on a (100) or (110) face, surface roughness on an atomic scale is required to explain the observations. If the molecule is adsorbed on a (111) face, no surface roughness need be invoked. In either case a metalnitrogen bond somewhere between the van der Waals (physisorbed) and covalent (chemisorbed) limits is indicated.