FOURIER-TRANSFORM RAMAN AND FOURIER-TRANSFORM IR SPECTROSCOPIC INVESTIGATION OF PYRAZINE ADSORBED BY SEPIOLITE AND BENTONITE FROM ANATOLIA

The adsorption of pyrazine by two different Anatolian sepiolites and b y natural and ion-exchanged (Fe, Co, Cu and Sn) bentonites was investi gated by vibrational spectroscopy, The spectroscopic results indicate that the pyrazine molecules adsorbed on sepiolite and bentonites are c oordinated to either surface hydroxyls by H-bonding interaction (in th e case of sepiolite) or to exchangeable cations (in the case of benton ites) through both nitrogen lone pairs as bidentate ligands, X-ray dif fraction patterns of the days were also recorded and the basal spacing s of pyrazine-treated natural and ion-exchanged bentonites were found to be around 14.7 Angstrom. The results suggest that pyrazine molecule s intercalate the interlayers of bentonite with a monolayer arrangemen t.