Abstract
Normal coordinate treatments were carried out for CH out-of-plane vibrations of pyridine, pyridine- N-oxide, and their methyl-derivatives on the basis of the simplified method presented previously, where the motions of only the ring hydrogen atoms were taken into account. A simplified and transferable force field was introduced and five force constants were refined for each of the two series of methylpyridines and their N-oxides. The assigned frequencies corresponding to the umbrella mode were reproduced with a root-mean-square difference of about 0.5% for each series.
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