X-ray studies of concentrated aqueous solutions

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.453556· OSTI ID:6511422

Ludwig, Jr, K F; Warburton, W K; Fontaine, A

Concentrated aqueous solutions of three transition metal bromides (ZnBr/sub 2/, CuBr/sub 2/, and NiBr/sub 2/) and an alkali bromide (RbBr) have been studied with differential anomalous scattering (DAS) and extended x-ray absorption fine structure (EXAFS). The aq-ZnBr/sub 2/ solutions exhibit considerable inner-shell ion complexing with the formation of tetrahedral complexes about the Zn/sup 2 +/. In aq-CuBr/sub 2/, the Cu/sup 2 +/ has an octahedral coordination shell. Most of the anions are bound directly to the cations in both solutions. In contrast, there are only a few Ni--Br nearest neighbors in aq-NiBr/sub 2/. Instead, cations and anions share hydrating water molecules. Preliminary data show that any ion complexing in aq-RbBr must be weak. These results are in good agreement with published thermodynamic studies.

• Research Organization: Department of Applied Physics, Stanford University, Stanford, California 94305
• OSTI ID: 6511422
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 87:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
BROMIDES
BROMINE COMPOUNDS
COHERENT SCATTERING
COPPER BROMIDES
COPPER COMPOUNDS
COPPER HALIDES
DIFFRACTION
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
MIXTURES
NICKEL BROMIDES
NICKEL COMPOUNDS
RUBIDIUM BROMIDES
RUBIDIUM COMPOUNDS
SCATTERING
SOLUTIONS
STRUCTURE FACTORS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
ZINC BROMIDES
ZINC COMPOUNDS
ZINC HALIDES