The Infrared Spectra of Naphthalene Crystals, Vapor, and Solutions

Abstract
The infrared spectra of naphthalene in the gas phase, in solutions of carbon tetrachloride, carbon disulfide, and methyl cyclopentane, and as single crystals have been obtained in the region 3300–450 cm−1. The dichroism of three different single crystal planes, including the cleavage plane, has been studied using polarized infrared radiation. The frequencies were segregated into their respective symmetry classes on the basis of an assumed oriented gas model. Band contour data, together with a statistical comparison of the spectrum of the gas phase with the spectra of the condensed phases, establish the usefulness of this model.