FTIR SPECTROSCOPIC STUDY OF INTERCALATED KAOLINITE

The intercalation complex of an ordered kaolinite with caesium acetate was studied by diffuse reflectance FTIR spectrometry. Since the direc t investigation of the hydroxyl stretching region of the complex is no t possible due to the strongly hygroscopic nature of the intercalated caesium acetate, a method has been proposed for the reliable analysis of the OH region after rehydration of the partially dehydrated complex over D2O. The frequency decrease and the broadening of the 3620 cm(-1 ) band in the resolved spectrum show the effect of the Cs+ cation sitt ing above the dioctahedral vacancy. (C) 1997 Elsevier Science B.V.