Abstract

Mass spectrometric studies of the gaseous equilibrium Pd+O ⇌ PdO yield the dissociation energy D 0 o(PdO)=56±3 kcal mol −1. This new value is significantly lower than one recommended in the most recent review, D 0 o(PdO)=90±20 kcal mol −1, where an earlier value near 55 kcal mol −1 was rejected because of higher values ranging from 90 to 98 kcal mol −1 for neighboring metal monoxides. It is shown that the lower value reported here is consistent with the unique closed-shell structure of the Pd atom.

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