title: A high-pressure NMR probe for aqueous geochemistry.
abstract: A non-magnetic piston-cylinder pressure cell is presented for solution-state NMR spectroscopy at geochemical pressures. The probe has been calibrated up to 20 kbar using in situ ruby fluorescence and allows for the measurement of pressure dependencies of a wide variety of NMR-active nuclei with as little as 10 μL of sample in a microcoil. Initial (11)B NMR spectroscopy of the H3BO3-catechol equilibria reveals a large pressure-driven exchange rate and a negative pressure-dependent activation volume, reflecting increased solvation and electrostriction upon boron-catecholate formation. The inexpensive probe design doubles the current pressure range available for solution NMR spectroscopy and is particularly important to advance the field of aqueous geochemistry.
authors.affiliation: Department of Chemistry, University of California, Davis, 1 Shields Ave, Davis, CA 95616 (USA).
authors.forename: Brent G
authors.initials: BG
authors.lastname: Pautler
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Colla
authors.forename: Rene L
authors.initials: RL
authors.lastname: Johnson
authors.forename: Peter
authors.initials: P
authors.lastname: Klavins
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Harley
authors.forename: C André
authors.initials: CA
authors.lastname: Ohlin
authors.forename: Dimitri A
authors.initials: DA
authors.lastname: Sverjensky
authors.forename: Jeffrey H
authors.initials: JH
authors.lastname: Walton
authors.forename: William H
authors.initials: WH
authors.lastname: Casey
keywords: NMR probe design; geochemistry; high-pressure NMR spectroscopy; reaction kinetics