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Molecular Oxygen Spin–Lattice Relaxation in Solutions Measured by Proton Magnetic Relaxation Dispersion

✍ Scribed by Ching-Ling Teng; Heedoek Hong; Suzanne Kiihne; Robert G. Bryant

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
62 KB
Volume
148
Category
Article
ISSN
1090-7807

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✦ Synopsis

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, acetonitrile, 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 T(1). The electron T(1) 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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