Orientational Ordering of Partially Deuterated Methanes and the Molecules with Partially Deuterated Methyl Groups in the Adsorbed Monolayers

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Heat capacity measurements were made for the monolayers of methane, methyl iodide, methanol, toluene, 4-methylpyridine, 2,6-dichlorotoluene, 2,6-dibromotoluene and their deuterated analogs, including the partially deuterated ones, in the temperature range from 0.7 K to 20 K. All the monolayers of the partially deuterated compounds showed a Schottky-type anomaly, indicating that the molecules (or methyl groups) are completely ordered in their orientation on the surface of graphite at such low temperatures. The results give some structural information that cannot be obtained from any structural/spectroscopic experiments.