Molecular Orbital Studies of the Structures and Reactions of Singly Charged Magnesium Ion with Water Clusters, Mg+(H2O)n

Hidekazu Watanabe, Suehiro Iwata, Kenro Hashimoto, Fuminori Misaizu, Kiyokazu Fuke

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134 Citations (Scopus)

Abstract

With ab initio molecular orbital calculations, the structures of the cation clusters Mg+(H2O)n and their hydrogen-eliminated products (MgOH)+(H2O)n-1 are optimized. In Mg+(H2O)n the hydration number of the most stable isomer is 3. In (MgOH)+(H2O)n-1 all water molecules are directly bonded to Mg+ for n ≤ 6. The hydration energy of (MgOH)+ is larger than that of Mg+ because of the strongly polarized (MgOH)+ molecular ion; Mg is oxidized halfway to Mg(II). The internal energy change of the hydrogen elimination of Mg+(H2O)n is positive for n = 1–5, but becomes negative for n = 6, which is in good agreement with the product switching in the TOF spectrum reported in the preceding paper by Sanekata et al. The effects of isotope substitution and equilibrium constants of the hydrogen (deuterium) elimination reaction observed in their experiment can be explained qualitatively.

Original languageEnglish
Pages (from-to)755-763
Number of pages9
JournalJournal of the American Chemical Society
Volume117
Issue number2
DOIs
Publication statusPublished - 1995 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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