R. 0. KAGEL
4518
Raman Spectra of Pyridine and 8-Chloropyridine Adsorbed on Silica Gel
by R. 0. Kagel Chemical Physics Research Laboratory, The Dow Chemical Company, Midland, Michaan 48640 (Received May 80, 1970)
The Raman spectra of pyridine and 2-chloropyridine over silica gel were obtained. Pyridine forms a species hydrogen-bonded to the silica gel surface; 2-chloropyridine does not hydrogen bond to the surface probably because of steric hindrance but rather forms a condensed liquid layer.
Introduction While the gas-solid interface has been extensively investigated by means of infrared spectroscopy, relatively few investigations have been reported on corresponding Raman Recently, Hendra and coworkersb observed the Raman spectra of pyridine both physisorbed and chemisorbed on several metal oxide surfaces. The metal oxides are conveniently weak Raman scatterers and the adsorption characteristics of the system can be studied over the entire spectral range (
