The application of resolution enhancement techniques to the study of factors affecting group frequencies—I. Coupling of symmetric methyl deformation frequencies in o-xylene

Abstract

Deconvolution of methyl symmetric deformation frequencies of o-, m- and p-xylene yields a fully resolved doublet with 10 cm −1 spacing in o-xylene, but singlets in m- and p-xylene. Resolution enhancement of the methyl bending mode of 1-methyl-2-[methyl- d 3]-benzene yields a single band near 1380 cm −1. The relative intensity of the heavy to light band systems is ∼ 0.4. The data indicate that spatial coupling exists between the symmetric methyl deformation modes of o-xylene.