Ab initio studies of (H2O)20H+ and (H2O)21H+ prismic, fused cubic and dodecahedral clusters

Can H3O+ ion remain in cage cavity?

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Abstract

The MP2/6-31G*//HF/6-31G* level study on (H2O)20H+ clusters suggests that the edge-shared prismic structure is more stable than a fused cubic or a dodecahedral cluster by ~7 and 22 kcal/mol, respectively. Only the dodecahedral cavity is large enough to enclose an H3O+ ion, and the hydronium ion originally placed in cavity either moves as a whole or loses its H+ ion to the surface during optimization and forms species like H5O2+, H7O3+ and H9O4+ ions on the surface. Based on HOH angular distortions and associated energy requirements we postulate that the edge-shared prismic or fused cubic clusters are not likely to form.

Original languageEnglish (US)
Pages (from-to)440-450
Number of pages11
JournalChemical Physics Letters
Volume319
Issue number5-6
DOIs
StatePublished - Mar 24 2000

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Ions
cavities
hydronium ions
energy requirements
ions
axioms
optimization
hydronium ion

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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title = "Ab initio studies of (H2O)20H+ and (H2O)21H+ prismic, fused cubic and dodecahedral clusters: Can H3O+ ion remain in cage cavity?",
abstract = "The MP2/6-31G*//HF/6-31G* level study on (H2O)20H+ clusters suggests that the edge-shared prismic structure is more stable than a fused cubic or a dodecahedral cluster by ~7 and 22 kcal/mol, respectively. Only the dodecahedral cavity is large enough to enclose an H3O+ ion, and the hydronium ion originally placed in cavity either moves as a whole or loses its H+ ion to the surface during optimization and forms species like H5O2+, H7O3+ and H9O4+ ions on the surface. Based on HOH angular distortions and associated energy requirements we postulate that the edge-shared prismic or fused cubic clusters are not likely to form.",
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AB - The MP2/6-31G*//HF/6-31G* level study on (H2O)20H+ clusters suggests that the edge-shared prismic structure is more stable than a fused cubic or a dodecahedral cluster by ~7 and 22 kcal/mol, respectively. Only the dodecahedral cavity is large enough to enclose an H3O+ ion, and the hydronium ion originally placed in cavity either moves as a whole or loses its H+ ion to the surface during optimization and forms species like H5O2+, H7O3+ and H9O4+ ions on the surface. Based on HOH angular distortions and associated energy requirements we postulate that the edge-shared prismic or fused cubic clusters are not likely to form.

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