Abstract
The temperature dependence of 13C spin-lattice ( R 1) and spin-spin ( R 2) relaxation rates has been studied for 60% enriched chloroform. R 1 is dominated by the intra-molecular dipole-dipole interaction with the proton, and R 2 by scalar coupling to the chlorine nuclei. The activation energies associated with the anisotropic molecular motion, and the rotational diffusion constant, D ⊥, were obtained from the 13C relaxation data and found to agree well with those obtained from deuterium and chlorine relaxation studies (1). The carbon-chlorine scalar coupling constant, Jcc1 = 23.3 ± 0.8 Hz, was obtained from the difference between R 2 and R 1.
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