Infrared spectra of alkyl tri(methyl/[2H3]methyl) ammonium iodides. Characteristic rocking vibrations of —N+(CH3)3 group at 970–910 cm–1

Abstract

Multiple strong absorptions in the region 970–910 cm^–1 have been found to be characteristic of —N⁺(CH₃)₃ group. From a study of the CD₃ analogues of RN(CH₃)⁺₃I^–, where R = methyl, butyl and hexyl and earlier work with R = aryl, it has been established that these absorptions arise mainly from CH₃ rocking modes and not skeletal modes as usually believed.