Abstract
In view of current interest in the problem of free or restricted internal rotation in molecules, we may mention briefly some results which indicate free rotation of methyl groups about the Cd—C bond in cadmium dimethyl. We have already described1 measurements on the rotational fine structure of some vibrational bands of zinc dimethyl and mercury dimethyl, which provided strong evidence for such free internal rotation in these molecules. The infrared absorption spectrum of cadmium dimethyl has now been measured with greater resolving power than that previously used by Gutowsky2, particularly in the region of 3 µ.
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