TY - JOUR
T1 - High-field QCPMG NMR of strontium nuclei in natural minerals
AU - Bowers, Geoffrey M.
AU - Lipton, Andrew S.
AU - Mueller, Karl T.
N1 - Funding Information:
This work was supported by the United States Department of Energy under Grant No. DE-FG07-99ER15012. ASL would like to acknowledge support from the National Institutes of Health (Federal Grant EB002050) and the United States Department of Energy Office of Biological and Environmental Research Program (KP13-01-03-0-22142). GMB would like to thank Joseph Ford for assistance with the experimental aspects of the 900 MHz instrument. Part of the research described in this paper was performed in the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the Department of Energy's Office of Biological and Environmental Research and located at Pacific Northwest National Laboratory. Funding for the 11.74 T spectrometer at Penn State was provided under NSF Grant No. CHE-9601572.
PY - 2006/2
Y1 - 2006/2
N2 - The only stable NMR-active isotope of strontium, 87Sr, is a spin-9/2 quadrupolar nucleus that has a low gyromagnetic ratio, a low natural abundance, and a large nuclear electric quadrupole moment. In this work, we utilize the quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) pulse sequence and a 21.14 T NMR spectrometer at the Pacific Northwest National Laboratory to characterize the strontium sites in the natural minerals strontianite (SrCO 3) and celestine (SrSO4). QCPMG at 21.14 T was found to provide sensitivity enhancements of roughly two orders of magnitude over Hahn-echo experiments at an 11.74 T magnetic field. We extracted the quadrupolar parameters for the strontium nuclei through iterative simulations of the experimental spectra with the SIMPSON program by Bak, Rasmussen, and Nielsen. The data show that the quadrupolar parameters of 87Sr appear to be highly sensitive to the symmetry of the strontium coordination environment and can thus provide information about the strontium binding environment in complex systems.
AB - The only stable NMR-active isotope of strontium, 87Sr, is a spin-9/2 quadrupolar nucleus that has a low gyromagnetic ratio, a low natural abundance, and a large nuclear electric quadrupole moment. In this work, we utilize the quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) pulse sequence and a 21.14 T NMR spectrometer at the Pacific Northwest National Laboratory to characterize the strontium sites in the natural minerals strontianite (SrCO 3) and celestine (SrSO4). QCPMG at 21.14 T was found to provide sensitivity enhancements of roughly two orders of magnitude over Hahn-echo experiments at an 11.74 T magnetic field. We extracted the quadrupolar parameters for the strontium nuclei through iterative simulations of the experimental spectra with the SIMPSON program by Bak, Rasmussen, and Nielsen. The data show that the quadrupolar parameters of 87Sr appear to be highly sensitive to the symmetry of the strontium coordination environment and can thus provide information about the strontium binding environment in complex systems.
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U2 - 10.1016/j.ssnmr.2005.08.002
DO - 10.1016/j.ssnmr.2005.08.002
M3 - Article
C2 - 16169195
AN - SCOPUS:29144509498
SN - 0926-2040
VL - 29
SP - 95
EP - 103
JO - Solid State Nuclear Magnetic Resonance
JF - Solid State Nuclear Magnetic Resonance
IS - 1-3
ER -