Abstract
Spin—lattice relaxation times of 13C nuclei in pyridine and tetrahydrofurane have been measured at various temperatures. Mainly dipole—dipole interaction was found to influence the relaxation behaviour below 273°K. Spin—rotation, which predominates at higher temperatures, was found to contribute about 25% to the measured relaxation rates at room temperature. The components of the spin—rotation coupling constant, c || and c . have been determined for pure pyridine, using results from 2H and 14N relaxation. Anisotropic rotational diffusion was found for both organic molecules in their mixtures with water.
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