2007
DOI: 10.1002/cphc.200700404
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Hydration of the Calcium Dication: Direct Evidence for Second Shell Formation from Infrared Spectroscopy

Abstract: Infrared laser action spectroscopy in a Fourier-transform ion cyclotron resonance mass spectrometer is used in conjunction with ab initio calculations to investigate doubly charged, hydrated clusters of calcium formed by electrospray ionization. Six water molecules coordinate directly to the calcium dication, whereas the seventh water molecule is incorporated into a second solvation shell. Spectral features indicate the presence of multiple structures of Ca(H2O)(7)2+ in which outer-shell water molecules accept… Show more

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Cited by 91 publications
(189 citation statements)
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References 77 publications
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“…With increasing number of water molecules, these do not anymore only act as ligands directly attached to the metal cation, but also form extended networks among each other via hydrogen bonding. Due to the resulting structural richness and fluxionality of larger M(H 2 O) n z+ ions, the combination of experiment and theory is particularly important in this area [15,16].…”
Section: Hydrated Coinage-metal Ionsmentioning
confidence: 99%
“…With increasing number of water molecules, these do not anymore only act as ligands directly attached to the metal cation, but also form extended networks among each other via hydrogen bonding. Due to the resulting structural richness and fluxionality of larger M(H 2 O) n z+ ions, the combination of experiment and theory is particularly important in this area [15,16].…”
Section: Hydrated Coinage-metal Ionsmentioning
confidence: 99%
“…The ability to form gaseous hydrated clusters of many di-(1) and trivalent (2) ions has greatly expanded the capabilities of mass spectrometry to investigate important ion solvation problems. Structural information of hydrated ions has been obtained from a variety of thermochemical methods (3)(4)(5) and spectroscopy (6)(7)(8)(9). From these studies, information about how water molecules organize around ions and how water can affect the structures of ions themselves can be obtained (8,9).…”
Section: ؉mentioning
confidence: 99%
“…For Co(NH 3 ) 6 (H 2 O) n 3ϩ , the average number of lost water molecules decreases for n Ն 40. This can be attributed predom- inantly to improved ion stabilization with increasing solvation.…”
Section: Effects Of Cluster Size and Metal Ion Identity On Ec Reactivmentioning
confidence: 99%
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“…In addition, for the heptahydrated metal ions, the seventh water molecule was shown to be in an outer solvation shell, bound much more weakly, by observing the rates of unimolecular dissociation reactions losing subsequent water molecules. Recently, the structures of hydrated Ca 2ϩ ions directly from an electrospray source have been studied by consequence spectroscopy [12] and thermochemically by collision-induced dissociation in a guided ion beam tandem mass spectrometer [13]. These…”
mentioning
confidence: 99%