Hydration Structure and Free Energy of Biomolecularly Specific Aqueous Dications, Including Zn2+ and First Transition Row Metals

D. Asthagiri, Lawrence R. Pratt, Michael Paulaitis, Susan B. Rempe

Research output: Contribution to journalArticle

Abstract

The hydration of some of the alkaline earth divalent metal cations and first row transition metal cations is considered within the quasi-chemical theory of solutions. Quantum chemical calculations provide information on the chemically important interactions between the ion and its first-shell water molecules. A dielectric continuum model supplies the outer-shell contribution. The theory then provides the framework to mesh these quantities together. The agreement between the calculated and experimental quantities is good. For the transition metal cations, it is seen that the ligand field contributions play an important role in the physics of hydration. Removing these bonding contributions from the computed hydration free energy results in a linear decrease in the hydration free energy along the period. It is precisely such effects that molecular mechanics force fields have not captured. The implications and extensions of this study to metal atoms in proteins are suggested.

Original languageEnglish (US)
Pages (from-to)1285-1289
Number of pages5
JournalJournal of the American Chemical Society
Volume126
Issue number4
DOIs
StatePublished - Feb 4 2004

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Hydration
Free energy
Transition metals
Metals
Cations
Positive ions
Alkaline Earth Metals
Physics
Divalent Cations
Mechanics
Alkaline earth metals
Molecular mechanics
Ions
Ligands
Water
Proteins
Atoms
Molecules

ASJC Scopus subject areas

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

Cite this

Hydration Structure and Free Energy of Biomolecularly Specific Aqueous Dications, Including Zn2+ and First Transition Row Metals. / Asthagiri, D.; Pratt, Lawrence R.; Paulaitis, Michael; Rempe, Susan B.

In: Journal of the American Chemical Society, Vol. 126, No. 4, 04.02.2004, p. 1285-1289.

Research output: Contribution to journalArticle

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