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2 H and 139 La NMR Spectroscopy in Aqueous Solutions at Geochemical Pressures
Author(s) -
Ochoa Gerardo,
Pilgrim Corey D.,
Martin Michele N.,
Colla Christopher A.,
Klavins Peter,
Augustine Matthew P.,
Casey William H.
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201507773
Subject(s) - aqueous solution , spectroscopy , nuclear magnetic resonance spectroscopy , chemistry , analytical chemistry (journal) , radiochemistry , physics , stereochemistry , environmental chemistry , quantum mechanics
Nuclear spin relaxation rates of 2 H and 139 La in LaCl 3 + 2 H 2 O and La(ClO 4 ) 3 + 2 H 2 O solutions were determined as a function of pressure in order to demonstrate a new NMR probe designed for solution spectroscopy at geochemical pressures. The 2 H longitudinal relaxation rates ( T 1 ) vary linearly to 1.6 GPa, consistent with previous work at lower pressures. The 139 La T 1 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.