The Structure of Phosphine and Related Hydrides

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Abstract
It is shown that Badger's rule when applied to the frequencies of some hydrides gives values for the interatomic distances which are in agreement with values deduced from the moments of inertia of the hydrides and with values predicted from the covalent radius suggested for hydrogen, 0.315A. Using the value 1.415A. for the phosphorus-hydrogen distance in phosphine and a reliable spectroscopic value for one of the moments of inertia of the molecule one finds the bond angle to be 93°. Values are suggested for the bond angles and bond distances in a number of hydrides whose structures have not been experimentally determined.