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| - Anisotropy of Molecular Reorientation in Pure Liquid Benzene Using Nuclear Relaxation ofthe Longitudinal 13C−H Two-Spin Order
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| - Simple pulse sequences have been used to determine and isolatemost carbon-13 and proton longitudinalrelaxation parameters in pure liquid benzene (carbon-13 in naturalabundance). The derived parameters includespecific longitudinal proton and carbon-13 relaxation rates, direct andremote proton−carbon cross-relaxationrates, proton−proton cross-relaxation rates, and thecross-correlation rate involving direct proton−carbondipolar interaction and carbon shielding anisotropy (the latter beingderived from the evolution of the initiallycreated longitudinal spin order). From these data, it was possibleto estimate the dipolar intermolecularcontributions to proton and carbon longitudinal nuclear relaxations andthe anisotropy of molecular reorientation(the two relevant correlation times are found to be at 25 °C: τ∥ = 0.58 ps and τ⊥ = 1.62 ps;τ⊥ associatedwith the tumbling of the symmetry axis perpendicular to the molecularplane and τ∥ associated with rotationaround this axis).
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