Dioxygen: What Makes This Triplet Diradical Kinetically Persistent?

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This article examines experimental heats of formation and enthalpies obtained from G4 calculations to find that the resonance stabilization of the two unpaired electrons in triplet O₂, relative to the unpaired electrons in two hydroxyl radicals, amounts to 100 kcal/mol.

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9 p.

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Borden, Weston T.; Hoffmann, Roald; Stuyver, Thijs & Chen, Bo June 14, 2017.

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This article examines experimental heats of formation and enthalpies obtained from G4 calculations to find that the resonance stabilization of the two unpaired electrons in triplet O₂, relative to the unpaired electrons in two hydroxyl radicals, amounts to 100 kcal/mol.

Physical Description

9 p.

Notes

Abstract: Experimental heats of formation and enthalpies obtained from G4 calculations both find that the resonance stabilization of the two unpaired electrons in triplet O2, relative to the unpaired electrons in two hydroxyl radicals, amounts to 100 kcal/mol. The origin of this huge stabilization energy is described within the contexts of both molecular orbital (MO) and valence-bond (VB) theory. Although O2 is a triplet diradical, the thermodynamic unfavorability of both its hydrogen atom abstraction and oligomerization reactions can be attributed to its very large resonance stabilization energy. The unreactivity of O2 toward both these modes of self-destruction maintains its abundance in the ecosphere and thus its availability to support aerobic life. However, despite the resonance stabilization of the π system of triplet O2, the weakness of the O–O σ bond makes reactions of O2, which eventually lead to cleavage of this bond, very favorable thermodynamically.

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  • Journal of the American Chemical Society, 2017. Washington, DC.: American Chemical Society

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  • Publication Title: Journal of the American Chemical Society
  • Volume: 139
  • Pages: 9010-9018
  • Peer Reviewed: Yes

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UNT Scholarly Works

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  • April 26, 2017

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  • June 14, 2017

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  • June 14, 2017

Added to The UNT Digital Library

  • Aug. 29, 2017, 9:38 a.m.

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  • Aug. 30, 2017, 3:02 p.m.

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Borden, Weston T.; Hoffmann, Roald; Stuyver, Thijs & Chen, Bo. Dioxygen: What Makes This Triplet Diradical Kinetically Persistent?, article, June 14, 2017; Washington, DC. (https://digital.library.unt.edu/ark:/67531/metadc991047/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.