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  • Title: Hydrated alkali-metal cations: infrared spectroscopy and ab initio calculations of M+(H2O)(x=2-5)Ar cluster ions for M = Li, Na, K, and Cs.
    Author: Miller DJ, Lisy JM.
    Journal: J Am Chem Soc; 2008 Nov 19; 130(46):15381-92. PubMed ID: 18939843.
    Abstract:
    A delicate balance between competing and cooperating noncovalent interactions determines the three-dimensional structure of hydrated alkali-metal ion clusters. With a single water molecule hydrating an ion, the electrostatic ion...water interaction dominates. With more than one water molecule, however, water...water hydrogen-bonding interactions compete with the ion...water interactions to influence the three-dimensional structure. Infrared photodissociation spectra of M(+)(H2O)(x=2-5)Ar (with effective temperatures of approximately 50-150 K, depending on size and composition) are reported for M = Li, Na, K, and Cs, and dependencies on ion size and hydration number are explored.
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