Infra-red dispersion studies. Part 8.—Band intensities and atomic polarizations of CHXCCl2(XF,Cl,Br) molecules

Abstract

Infra-red dispersion studies lead to accurate values for the intensities of strong bonds and moderately accurate values for weaker bands. These intensity data can be used to yield information on the polar properties of valence bonds and on intermolecular interactions.

The dispersion and intensity data for CX₂CCl₂ molecules (XH, CI, F) have been reported. The variations in band intensities for a particular mode were used to obtain information about the effects of a particular group or polar bond on other parts of the molecule. As an extension of this work, the CHXCCl₂ molecules have been studied. They are well suited to this kind of study since the vibrational bands are intense and relatively well separated. Accurate intensity measurements may therefore be made using the interferometric technique.