FT-IR and FT-Raman spectroscopic study of surface species of 2-aminopyridine adsorbed by sepiolite from Anatolia

The absorption of 2-aminopyridine by Anatolian sepiolite was investigated b y Fourier-transform infrared and Fourier-transform Raman spectroscopy. The spectroscopic results indicate that 2-aminopyridine molecules adsorbed on s epiolite are coordinated to Lewis acidic centers or surface hydroxyls by H- bonding interaction through the pyridine ring nitrogen lone pairs. No physi cal sorbed species has been detected. Monocationic surface species has not been detected under the conditions applied. It must be noted that the adsor ption of aminopyridine affected the hydroxyl group vibrations of sepiolite.