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Three spectral properties, frequency shift Av, band width v>/, and integrated intensity B, have been measured for a variety of hydrogen bonding systems X-H • • Y in solution. A linear relation is found between Av and yy, which is applicable to a wide variety of systems: yy, = 0.72 Ay + 2.5 cm.-1. A simple monotonic relation is also found between Ay and B. The intensity is discussed with reference to the intensities of X-H bending modes; polarization in the base molecule is suggested.

The concentration and temperature dependences of proton magnetic resonance measurements on chloroform in acetone and triethylamine solutions are presented. The behavior is similar to hydrogen bonding systems and it is concluded that there is a specific interaction involving the chloroform proton and the solvent molecule. In each system the data are consistent with the assumption of a one-to-one complex. Equilibrium constants and heats of formation are calculated.

Infrared measurements of the frequency and intensity of the C — D stretching and bending motions of CDCl3 in various solvents are presented. The expected relationship between heat of solution and lowered stretching frequency is shown not to extend to CDCl3. There is, however, a correlation between apparent integrated intensity of this band and the extent of interaction in the same solvent. The band is over thirty times as intense in triethylamine as in carbon tetrachloride solution. No large change in the intensity of the bending motion was observed. The infrared spectral properties of chloroform-d are interpreted to indicate molecular interactions similar to hydrogen bonding interactions.