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J. Phys. Chem. 1988, 92, 357-360 357 due to the distortion of the double ring."

Summary: J. Phys. Chem. 1988, 92, 357-360 357
due to the distortion of the double ring."
900-1200 cm-l. The infrared spectrum of zeolite A shows a
strong band at 995 cm-I, along with weak shoulders at 1050 and
1090cm".'' These bands have been assigned to T-O asymmetric
stretches and are sensitive to the Si/Al ratio. The Raman
spectrum of zeolite A showsthree well-defined bands in this region
at 972, 1050, and 1103 cm-I. We have assigned these bands as
arising from Si-0 stretches." On the basis of studies of Li+
partially exchanging into Na12Aand KI2A,we have proposed that
these vibrations were localized on motions of the three different
types of oxygen atoms in zeolite A. The bands at 972, 1050, and
1103 cm-' were assigned to T-0(3), T-0(1), and T-O(2)
stretching motions, respectively.I2 From No et al.'s calculations
of vibrations of zeolite A,I7it is indeed clear that such a localized
motion of only one of the types of oxygen is indeed possible. They
calculate a band at 1088 cm-' which is characterized by the
asymmetric stretch of the Si2A1,(0(3)), ring with no motion from
the other O(1) and O(2) oxygen atoms. Examination of their
normal modes also show a calculated frequency at 1134 cm-I,


Source: Apkarian, V. Ara - Department of Chemistry, University of California, Irvine


Collections: Chemistry