2H and 139LaNMR Spectroscopy in Aqueous Solutions at Geochemical Pressures

Nuclear spin relaxation rates of 2H and 139La in LaCl3+2H2O and La(ClO4)3+2H2O solutions were determined as a function of pressure in order to demonstrate a new NMR probe designed for solution spectroscopy at geochemical pressures. The 2H longitudinal relaxation rates (T1) vary linearly to 1.6GPa, c...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2015-12, Vol.54 (51), p.15444
Main Authors: Ochoa, Gerardo, Pilgrim, Corey D, Martin, Michele N, Colla, Christopher A, Klavins, Peter, Augustine, Matthew P, Casey, William H
Format: Article
Language:English
Subjects:
Aqueous solutions
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Summary:Nuclear spin relaxation rates of 2H and 139La in LaCl3+2H2O and La(ClO4)3+2H2O solutions were determined as a function of pressure in order to demonstrate a new NMR probe designed for solution spectroscopy at geochemical pressures. The 2H longitudinal relaxation rates (T1) vary linearly to 1.6GPa, consistent with previous work at lower pressures. The 139La T1 values vary both with solution chemistry and pressure, but converge with pressure, suggesting that the combined effects of increased viscosity and enhanced rates of ligand exchange control relaxation. This simple NMR probe design allows experiments on aqueous solutions to pressures corresponding roughly to those at the base of the Earth's continental crust.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201507773