Preparation and infrared spectra of hexamethylenetetramine–di-iodine (1/1, 1/2, and 1/3)

The i.r. spectra (50–1 350 cm–1) of the solid 1 : 1 and 1 : 2 adducts of hexamethylenetetramine with iodine are discussed with reference to the recently determined crystal structures for these compounds. The preparation of the solid 1 : 3 adduct is reported for the first time, and its i.r. spectrum is analyzed. The spectrum is consistent with a C3v structure in which three iodine molecules are bound to three of the four available nitrogen donor sites in the amine. The preparative method used in a previously reported 129I Mössbauer study of the 1 : 1 adduct has been reinvestigated, and it is shown that the compound studied was probably the 1 : 2 adduct.