Valence bond modeling of barriers in the nonidentity hydrogen abstraction reactions, X′· + H-X → X′-H + X· (X′ ≠ X = CH3, SiH3, GeH3, SnH3, PbH3)

Lingchun Song, Wei Wu, Kunming Dong, Philippe C. Hiberty, Sason Shaik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Breathing orbital valence bond (BOVB) computations (Hiberty, P.C.; Humbel, S.; Byrman, C.P.; van Lenthe, J.H. J. Chem. Phys. 1994, 101, 5969) are used to obtain nonidentity barriers for hydrogen transfer reactions between X and X′ groups, X ≠ X′ = CH3; SiH3, GeH3, SnH3, PbH3. Modeling of these barriers by means of VB state correlation diagrams (Shaik, S.; Shurki, A. Angew. Chem., Int. Ed. Engl. 1999, 38, 586) leads to a simple expression for the barrier (eq 29) as an interplay of an intrinsic term and the reaction driving force. The equation predicts barrier heights that are compatible with the BOVB computed barrier heights. Its comparison with the Marcus equation shows similarities and differences.

Original languageEnglish
Pages (from-to)11361-11370
Number of pages10
JournalJournal of Physical Chemistry A
Volume106
Issue number46
DOIs
StatePublished - 21 Nov 2002

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