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13C spin-lattice relaxation times (Tx) are reported for 60% enriched samples of CH3OH, CH3I, CH3Br, CHBr3, CHC13, CH313COOH, and CS2, each measured over a wide range of temperatures at 15.1 MHz. Data are also given on the magnetic field dependence of Ti(13C) in CH3OH, CH3I, and CH313COOH. The U results, together with nuclear Overhauser enhanceménts measured for the foregoing hydrogen-containing molecules, as well as for CH313COCH3,13CH3COOCD3, and (CH3)4Si, are interpreted in terms of the probable relaxation mechanisms.

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