Nuclear relaxation of H-2 and H-2@C-60 in organic solvents

The 1-H nuclear spin-lattice relaxation time (T-1) of H-2 and H-2@C-60 in organic solvents varies with solvent, and it varies proportionally for H-2 and for H-2@C-60. Since intermolecular magnetic interactions are ruled out, the solvent must influence the modulating processes of the relaxation mechanisms of H-2 both in the solvent cage and inside C-60. The temperature dependence of T-1 also is very similar for H-2 and H-2@C-60, T-1 going through a maximum by varying the temperature in solvents which allow a wide range of temperatures to be explored. This behavior is attributed to the presence of dipolar and spin-rotation mechanisms which have an opposite dependence on temperature.