NDLI: Gas-Phase Reactions of hydrated alkaline earth metal ions, M$^{2+}$(H$_{2}$O)$_{ n }$ (M = Mg, Ca, Sr, Ba and n = 4

Content Provider	Springer Nature Link
Author	Rodriguez Cruz, Sandra E. Williams, Evan R.
Copyright Year	2001
Abstract	Gas-phase reactions of hydrated divalent alkaline earth metal ions and benzene were investigated by electrospray ionization Fourier-transform mass spectrometry. Rate constants for solvent-exchange reactions were determined as a function of hydration extent for Mg$^{2+}$, Ca$^{2+}$, Sr$^{2+}$, and Ba$^{2+}$ clusters containing four to seven water molecules each. All of the strontium and barium clusters react quickly with benzene. Barium reacts slightly faster than the corresponding strontium cluster with the same number of water molecules attached. For calcium, clusters with four and five water molecules react quickly, whereas those with six and seven water molecules do not. Magnesium with four water molecules reacts quickly, but not when five through seven water molecules are attached. The slow reactivity observed for some of these clusters indicates that the cation—π interaction between the metal ion and benzene is partially screened by the surrounding water molecules. The reactivity of magnesium with seven water molecules is intermediate that of the hexa- and pentahydrate and the tetrahydrate. This result is consistent with the seventh water molecule being in the outer shell and much more weakly bound. The unusual trend in reactivity observed for magnesium may be due to the presence of mixed shell structures observed previously. These results are the first to provide information about the relative importance of cation—π interactions in divalent metal ions as a function of metal hydration extent. Such studies should also provide a model and some insight into the relative binding affinities of divalent metal ions to aromatic residues on peptides and proteins.
Starting Page	250
Ending Page	257
Page Count	8
File Format	PDF
ISSN	10440305
Journal	Journal of The American Society for Mass Spectrometry
Volume Number	12
Issue Number	3
e-ISSN	18791123
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Institution	The American Society for Mass Spectrometry
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Structural Biology

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