Variation of the intensity of infrared bands of chloroform and acetone with temperature

Abstract

Intensities of i.r. bands at 1213 cm^–1 in chloroform (ν₄) and at 1087 cm^–1 in acetone (ν₂₂) are measured at temperatures between 170 and 300 K using different spectrophotometers (one with pre-sample chopping). The chloroform band is approximately independent of temperature but the acetone band has a negative temperature coefficient. These results are independent of the type of spectrophotometer used. The implications of these results and related data in the literature are discussed in connection with the use of i.r. intensity measurements at different temperatures for the determination of themodynamic parameters.