Infrared studies of CH and CD stretching anharmonicity

Abstract

Progress is reported in the analysis of CH and CD stretching overtones and their accompanying Fermi resonances in C₂H₄, C₂H₃D, CH₂CD₂ and C₂HD₃. CH stretching overtone data have been obtained for a number of partially deuterated alkanes, halogenated alkanes, MeCN, MeC₂H, MeNH₂, Me₂NH, MeOH and Me₂O. Values of anharmonicity constants x_ii obtained from these are compared with the results of local-mode studies. A provisional Fermi resonance analysis of CH(CD₃)₃ is reported. The possiblity of a relationship between x_ii, ω_i and CH dissociation energy is explored.