The hydration shell of Na+ ion in the gas phase (∼4) is smaller than that in solution (6). The energetics of various solvated Na+ clusters indicate that lowering the pairwise interaction between the ligand and the ion can increase the coordination number in the gas phase. We report here the first hexa-coordinated Na+ cluster ion in the gas phase, which can be formed by substituting H2O with 1,4-difluorobenzene. Infrared-photodissociation spectroscopy of the O–H stretch was used to infer the structure.
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Patwari et al. (2003) studied this question.
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