II. The Effective Methyl Mass and Its Use in Determining the Force Constants and Character of Metallo-Organic Bonds

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Abstract
The ``effective methyl masses'' of the Group IV tetramethyl derivatives and the analogous tetramethyl ammonium ion are shown to give a linear relationship when plotted against their respective stretching and bending frequencies. The linear relationships are used to determine ``effective methyl masses'' from Group V trimethyl stretching and bending frequencies and from some Group VI dimethyl stretching frequencies. Then the ``effective methyl masses'' so determined are used in simplified calculations to predict stretching and bending force constants for Groups V and VI methyl derivatives. This procedure is shown to give stretching force constants for dimethyl mercury and dimethyl zinc which are in good agreement with those obtained by Gutowsky on the basis of a less approximate normal coordinate treatment, the average deviation being 1 percent. Finally this large number of new metallo‐organic force constants is summarized with existing metallo‐organic force constants and the nature of the metallo‐organic bond is discussed.
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