Far Infrared Spectrum and Structure of Disiloxane

Abstract

Study of the infrared absorption of gaseous disiloxane in the range 50–150 cm—1 shows that significant absorption is confined to the lower part of the range. A broad band with five rather flat maxima at about 56.4, 69.2, 80.1, 90.5, and 100 cm—1 is interpreted as the spectrum of the mixed vibrational and rotational transitions of a quasilinear triatomic molecule. The consequences of this model of disiloxane for the vibrational spectra of the molecule at higher frequencies are discussed and various unusual features of the spectra explained on the basis of the model.