Computational Studies of Open-Shell Phosphorus Oxyacids. 1. P-H Bond Homolysis in H2PO2

Christopher J. Cramer, George R. Famini

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The hypothetical molecule dihydrodioxophosphoranyl (1) has been studied computationally. Both 3-21G(⋆) and 6-31G unrestricted Hartree-Fock (UHF) wave functions exhibited inherent doublet instability which was corrected for by consideration of correlation effects. Configuration interaction proved most effective in this respect, while Mϕller-Plesset perturbational corrections were fair when extended to third order and only marginal when truncated at second order. The barrier to P-H bond homolysis was determined to be 4.8 ± 0.3 kcal/mol. The metastability of 1 has been explained in the formalism of valence bond theory. It arises from interactions of degenerate valence bond functions corresponding to reactants and products with an intermediate configuration corresponding to a n ⟶π (1A2⟶3B1) excited state. Predicted spectral data to aid in the identification of 1 are presented.

Original languageEnglish (US)
Pages (from-to)5460-5464
Number of pages5
JournalJournal of the American Chemical Society
Issue number14
StatePublished - Jan 1990


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