The interaction of iodine with pyridine and 2,6-dimethylpyridine in carbon tetrachloride and cyclohexane

Abstract

Calorimetric and spectroscopic measurements of the formation constant and molar enthalpy of complexation for the interaction of pyridine and 2,6-dimethylpyridine with iodine, in carbon tetrachloride and in cyclohexane, have been carried out. Di-ortho substituents cause a decrease in the formation constant but do not greatly influence the value of the enthalpy of formation. Differences in results obtained by the two methods are interpreted as being due to the formation of ‘contact’ complexes.