Vibrational spectra and intermolecular association

Abstract

The nature of the intermolecular association of furfural and of some nitroso aromatic compounds has been examined by measuring the infrared absorption spectra in different states of aggregation and under a variety of physical conditions. In the case of furfural, the behaviour of several bands suggests that dipolar aggregation may occur. Variations of intensity or the shifts in position of some of these bands have been correlated with the dielectric properties of solvents in which they arise. From the spectra of nitrosobenzene, nitroso-mesitylene and p-iodo-nitrosobenzene, vibration frequencies have been suggested for the NO group in the monomeric and dimeric forms.