TY - JOUR
T1 - Molecular oxygen spin-lattice relaxation in solutions measured by proton magnetic relaxation dispersion
AU - Teng, Ching Ling
AU - Hong, Heedoek
AU - Kiihne, Suzanne
AU - Bryant, Robert G.
N1 - Funding Information:
This work was supported by the National Institutes of Health, GM34541 and GM54067. We appreciate helpful discussions with Jack Freed and the assistance of Charles Holmes and Shawn Wagner.
PY - 2001
Y1 - 2001
N2 - Proton spin-lattice relaxation rate constants have been measured as a function of magnetic field strength for water, water-glycerol solution, cyclohexane, methanol, benzene, acetone, aceto-nitrile, and dimethyl sulfoxide. The magnetic relaxation dispersion is well approximated by a Lorentzian shape. The origin of the relaxation dispersion is identified with the paramagnetic contribution from molecular oxygen. In the small molecule cases studied here, the effective correlation time for the electron-nuclear coupling may include contributions from both translational diffusion and the electron T1. The electron T1 for molecular oxygen dissolved in several solvents was found to be approximately 7.5 ps and nearly independent of solvent or viscosity.
AB - Proton spin-lattice relaxation rate constants have been measured as a function of magnetic field strength for water, water-glycerol solution, cyclohexane, methanol, benzene, acetone, aceto-nitrile, and dimethyl sulfoxide. The magnetic relaxation dispersion is well approximated by a Lorentzian shape. The origin of the relaxation dispersion is identified with the paramagnetic contribution from molecular oxygen. In the small molecule cases studied here, the effective correlation time for the electron-nuclear coupling may include contributions from both translational diffusion and the electron T1. The electron T1 for molecular oxygen dissolved in several solvents was found to be approximately 7.5 ps and nearly independent of solvent or viscosity.
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U2 - 10.1006/jmre.2000.2219
DO - 10.1006/jmre.2000.2219
M3 - Article
C2 - 11133273
AN - SCOPUS:0035743662
SN - 1090-7807
VL - 148
SP - 31
EP - 34
JO - Journal of Magnetic Resonance
JF - Journal of Magnetic Resonance
IS - 1
ER -