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Anomalous x-ray diffraction studies of Sr2+ hydration in aqueous solution

AuthorsRamos, Sonia ; Neilson, G. W.; Barnes, A. C.; Capitán, M. J.
Issue Date22-Mar-2003
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 118(12): 5542 (2003)
AbstractAnomalous x-ray diffraction experiments were carried out at two energies below the K edge of strontium on a 3.5 molal solution of strontium chloride in water. The first order difference method was applied to the corrected and normalized data sets, and a difference function for the Sr2+ coordination obtained. Fourier transformation of this function gave a modified total radial distribution function for Sr2+, which when analyzed showed that there are eight to nine nearest neighbor water molecules sited at 2.67 Å from the Sr2+ ion. A second coordination shell is also apparent in the range 4.5< r(Å)<5.5 which can accommodate Cl– counterions and a second shell of water molecules. The results obtained for the distance between Sr2+ and O are in excellent agreement with those obtained from standard x-ray diffraction, extended x-ray absorption fine structure, and neutron diffraction isotopic substitution. The hydration structure obtained for Sr2+ is compared with the structure of two other ions in the alkaline earth series (Mg2+ and Ca2+).
Description5 pages, 3 figures, 2 tables.
Publisher version (URL)http://dx.doi.org/10.1063/1.1555633
Appears in Collections:(CFMAC-IEM) Artículos
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