Journal ArticleDOI
The coordination (hydration) of rare earth ions in aqueous chloride solutions from x‐ray diffraction. III. SmCl3, EuCl3, and series behavior
TLDR
In this paper, the inner sphere water coordination of rare earth ions in aqueous solutions decreases from nine to eight due to decreasing rare earth ionic radii, and the average water coordination is 8.8 for Sm3+ and 8.3 for Eu3+.Abstract:
The inner sphere water coordination of Sm3+ and Eu3+ in concentrated (3.23 m) aqueous chloride solutions was obtained from x‐ray diffraction measurements at 25 °C. The average water coordination is 8.8 for Sm3+ and 8.3 for Eu3+. The average RE3+–H2O distances are 2.474 A for Sm3+ and 2.450 A for Eu3+. The average RE3+⋅⋅⋅Cl− ion pair distances occur near 4.9 A. A careful examination of the x‐ray diffraction results for ten rare earth chloride solutions indicates that the inner sphere water coordination of the rare earth ions in aqueous solutions decreases from nine to eight due to the decreasing rare earth ionic radii. The ions La3+ through Nd3+ are nine coordinated, those between Nd3+ and Tb3+ are transitional between nine and eight, and those from Tb3+ to Lu3+ are eight coordinated.read more
Citations
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Journal ArticleDOI
The aqueous geochemistry of the rare-earth elements and yttrium
TL;DR: Theoretical considerations suggest that trivalent REE and Y should exhibit strong, predominantly electrostatic complexing with hard ligands such as fluoride, sulfate, phosphate, carbonate and hydroxide and this is borne out by the available experimental data.
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Inorganic and bioinorganic solvent exchange mechanisms.
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Water exchange on metal ions: experiments and simulations
Lothar Helm,Andre E. Merbach +1 more
TL;DR: In this article, the authors demonstrate the complementary of experimental studies and computer simulations or quantum chemical calculations performed on the water exchange reaction between coordination shells around metal ions in aqueous solution.
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Solution and solid-state structural chemistry of actinide hydrates and their hydrolysis and condensation products.
Karah E. Knope,Lynda Soderholm +1 more
Journal ArticleDOI
Luminescence study on determination of the hydration number of Cm(III)
TL;DR: In this paper, a luminescence study of Cm(III) has shown a linear correlation between the decay constant kobs (the reciprocal of the excited-state lifetime) and the number of water molecules nH2o in the first coordination sphere of complexes.
References
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Elements of X-ray diffraction
TL;DR: In this article, the authors present a chemical analysis of X-ray diffraction by Xray Spectrometry and phase-diagram Determination of single crystal structures and phase diagrams.
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International tables for X-ray crystallography
Norman Fordyce McKerron Henry,Lonsdale, Kathleen, Dame,John S. Kasper,Caroline H. MacGillavry,Gerard D. Rieck,James A. Ibers,Walter C. Hamilton +6 more
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X-ray diffraction procedures for polycrystalline and amorphous materials
Harold P. Klug,Leroy Alexander +1 more