Adsorption of haloadamantanes on the basal face of graphite

The graphite surface exhibits different structural selectivity to isomeric haloadamantanes depending on the kind and number of halogen atoms in the molecule. In the series of fluoro-, chloro-, bromo-, and iodoadamantanes, the selectivity of separation of the respective isomers on columns packed with graphitized thermal soot increases. The equilibrium adsorption characteristics of haloadamantanes (adsorption equilibrium constants, heats and entropies of adsorption), calculated within the framework of molecular-statistical theory, agree well with the experimental values and allow comprehensive description of the adsorbed state of these compounds on the graphite surface. The results of molecular-statistical calculations allow evaluating the possibility of haloadamantane separation on columns with graphitized thermal soot under the conditions of equilibrium gas-adsorption chromatography.