Characteristic vibrations of —N(CH3)2 and —N+(CH3)3 groups in dimethyl aminophenols and their methiodides

Abstract

From an analysis of the infrared spectra of dimethylaminophenols and their methiodides, along with their —N(CD₃)₂ and —N⁺(CD₃)₃ derivaties, the characteristic absorptions of the —N(CH₃)₂ and —N⁺(CH₃)₃ groups have been assigned. Strong absorptions near 950 cm^–1, generally ascribed to C—N stretching modes in a large number of compounds containing the —N⁺(CH₃)₃ group, have been found to arise from CH₃ rocking modes.