Aqua species of Mg2+, Ca2+, Sr2+ and Ba2+
المؤلف:
CATHERINE E. HOUSECROFT AND ALAN G. SHARPE
المصدر:
Inorganic Chemistry
الجزء والصفحة:
p 288
21-1-2018
1765
Aqua species of Mg2+, Ca2+, Sr2+ and Ba2+
Using 17O-labelled water, it is possible to confirm the hydration number in [Mg(H2O)6]2+ by use of 17O NMR spectroscopy, but for the aqua ions of Ca2+, Sr2+ and Ba2+, exchange between coordinated water and solvent is too fast on the NMR timescale for such studies. An octahedral coordination sphere has been established for [Mg(H2O)6]2+ in a number of crystalline salts, and also for [Ca(H2O)6]2+. The [Mg(H2O)6]2+ ion dissociates to some extent in aqueous solution, but hydrated cations of the later metals are not appreciably ionized and solutions of their salts derived from strong acids are neutral.
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