Far Infrared Spectra of Strongly Polar Molecules in Solid Solution. III. Cyanoacetylene, Cyanogen Chloride, and Propionitrile

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Abstract
The spectral range around and below 100 cm−1 yields information on the intermolecular motion of molecules. In solid rare gas matrices aprotic molecules such as cyanogen chloride and propionitrile behave similarly to acetonitrile, which has previously been studied. All of these compounds are trapped in the matrix both as monomers and as antiparallel dimers, each of which exhibits a characteristic absorption spectrum uniquely related to intermolecular motions. H‐bonding compounds such as cyanoacetylene or hydrogen cyanide may be present in a solid rare gas matrix in the form of at least three different species: (a) isolated monomer molecules, (b) linear dimers, and (c) chainlike multimers. Each of these three species provides a characteristic far IR absorption pattern, which is, again, uniquely related to intermolecular motions.