Iodine monochloride and iodine trichloride complexes with heterocyclic amines

Molecular addition compounds of iodine monochloride with 4-picoline, quinoline, and piperidine, and of iodine trichloride with pyridine, 2-picoline, 4-picoline, 2,6-lutidine, quinoline, and piperidine have been prepared. The stoichiometry of these compounds is 1:1 in amine to iodine chloride. Comparisons of melting points are made and the trend interpreted as reflecting a greater degree of ionic character in iodine trichloride complexes with amines as compared with iodine monochloride complexes with similar amines.