Solvation structure and ion complexation of La in a 1 molal aqueous solution of lanthanum chloride
Journal of Physical Chemistry A, ISSN: 1089-5639, Vol: 115, Issue: 24, Page: 6575-6581
2011
- 40Citations
- 44Captures
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Metrics Details
- Citations40
- Citation Indexes40
- 40
- CrossRef39
- Captures44
- Readers44
- 44
Article Description
H/D isotopic substitution neutron scattering and X-ray scattering have been used to investigate the short and intermediate range solution structure in a 1 m aqueous solution of lanthanum chloride. To improve the reliability of the local structural information on the cation environment, information has been incorporated from Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy data into the applied analytical framework. The markedly different structural sensitivities of the experimental probes allow the construction of a detailed three-dimensional atomistic model using the Empirical Potential Structure Refinement (EPSR) technique. The results show that at the investigated concentration La is hydrated by eight water molecules and one chloride ion, forming an inner-sphere ion complex in which the water molecules maintain angular configurations consistent with a tricapped trigonal prism configuration. This local geometry considerably disrupts the bulk solvent structure. © 2011 American Chemical Society.
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