Coordination (hydration) of rare earth ions in aqueous chloride solutions from x-ray diffraction. III. SmCl/sub 3/, EuCl/sub 3/, and series behavior
The inner sphere water coordination of Sm/sup 3 +/ and Eu/sup 3 +/ in concentrated (3.23 m) aqueous chloride solutions was obtained from x-ray diffraction measurements at 25 /sup 0/C. The average water coordination is 8.8 for Sm/sup 3 +/ and 8.3 for Eu/sup 3 +/. The average RE/sup 3 +/--H/sub 2/O distances are 2.474 A for Sm/sup 3 +/ and 2.450 A for Eu/sup 3 +/. The average RE/sup 3 +/xxxCl/sup -/ 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 La/sup 3 +/ through Nd/sup 3 +/ are nine coordinated, those between Nd/sup 3 +/ and Tb/sup 3 +/ are transitional between nine and eight, and those from Tb/sup 3 +/ to Lu/sup 3 +/ are eight coordinated.
- Research Organization:
- Ames Laboratory--USDOE, Department of Physics, and Department of Chemistry, Iowa State University, Ames, Iowa 50011
- OSTI ID:
- 5400728
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 73:1; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
AQUEOUS SOLUTIONS
CHLORIDES
CHLORINE COMPOUNDS
COHERENT SCATTERING
DIFFRACTION
DISPERSIONS
EUROPIUM CHLORIDES
EUROPIUM COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDRATION
MIXTURES
RARE EARTH COMPOUNDS
SAMARIUM CHLORIDES
SAMARIUM COMPOUNDS
SCATTERING
SOLUTIONS
SOLVATION
X-RAY DIFFRACTION