No abstract

Measurements have been made of the ultrasonic velocity in thirty-four organic liquids over a temperature range of 0−60°C by use of a variable-path ultrasonic interferometer operating at 500,000 cycles per second. For all of the liquids studied the relation between velocity and temperature was found to be essentially linear. Values of density, adiabatic compressibility, and temperature coefficient (ΔV/ΔT) are also reported. It was found that the successive substitution of a heavier atom in a molecule leads to successively smaller temperature coefficients. It is pointed out that the temperature coefficient of ultrasonic velocity appears to be inversely proportional to the square root of the molecular weight, to a fair degree of accuracy.

The infrared spectra of thionyl chloride and sulfuryl chloride have been investigated from 400 cm—1 to to 5000 cm—1 with a prism spectrometer. Three of the fundamentals of SOCl2 have been found and four for SO2Cl2. They and the various additional bands have been assigned to their appropriate symmetry species assuming SOCl2 has C8 symmetry and SO2Cl2 has C2v symmetry.

In the past the chief use of measurements of the velocity of sound in liquids has been in the determination of the adiabatic compressibility from which the ratio of the specific heats may be found provided the isothermal compressibility is known. At the same time certain qualitative facts relating the sound velocity to structure have become well known. These showed that the velocity of sound itself was not an additive and constitutive property, and little application of measurements of the velocity of sound to the elucidation of molecular structure seemed possible, until Rao discovered a function of the velocity which was independent of the temperature. Rao (15,16) showed that in any one liquid the density and the velocity of

The infrared absorption spectrum of gaseous SF6 has been investigated from 2 to 25μ with prism spectrometers of high resolution. The frequencies of the infrared active fundamentals found by earlier workers have been confirmed with the exception of one, formerly found at 965 cm−1, which is shown to be at 940 cm−1. However, the remainder of the spectrum differs considerably from previous work. With the aid of the Raman data, the observed spectrum has been interpreted in detail.