Abstract
The NMR spin-lattice relaxation times, T 1 , of deuteron and nitrogen-14 of a symmetric-top molecule of acetonitrile-d 3 confined to Sol-gel porous silica glasses were measured as a function of pore size over the temperature range 233-308 K. In agreement with our earlier results for other polar liquids we found the two-state fast-exchange model to be valid for both deuteron and nitrogen-14 spin-lattice relaxation data of acetonitrile-d 3 . The classical rotational diffusion equation was used to calculate the rotational diffusion constants, D∥ and D⊥, corresponding to motion about tge main symmetry axis and motion about tge axis perpendicular to tge main symmetry axis, respectively
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