Abstract: ¹H NMR spectra of benzene, cyclohexane and n-hexane and ²H NMR spectra of benzene-d₆ absorbed on four charcoals with different pore structures were measured at various temperatures in the range from 297 to 195 K. At room temperature ¹H NMR and ²H NMR spectra of each of the above mentioned compounds were singlets with different line widths(△γ_1/2) which increased with decreasing temperature. The Inγ_1/2 vs. reciprocal absolute temperature plots showed linear relationship with intersection. For C₆D₆ systems solid powder patterns were observed at temperatures where intersection occurred. Except for charcoal 2^# solid powder patterns appeared at almost identical temperatures for charcoal 3^#, 4^# and 5^#. The appearence of solid powder patterns suggests that the absorbed species in the 3D liquid state turned to 3D solid.

Key words: Charcoal, Hydrocarbons (benzene,cyclohexane,n-hexane,benzene-d₆), ¹H NMR, ²H NMR, The width at half height of the spectrum, Temperature variation, Solid powder pattern