Vapour pressure
measurements of systems of the type perfluorocarbon
bromide or iodide-trimethylamine have been made. These measurements clearly
show that, at sufficiently low temperatures, a solid 1 : 1 adduct is reversibly
formed. For the systems 1,2- dibromotetrafluoroethane-trimethylamine
and trifluoro-methyl bromide- tetramethylethylenediamine
1 : 2 and 2 : 1 halide-amine adducts respectively were also observed. These
stoicheiometries show that the dominant interaction leading to adduct formation
is between the nitrogen and bromine atoms. Systems giving 1 : 1 stoicheiometry
were examined at higher temperatures at which liquid and vapour but no solid
phase is present. Strong negative deviations from ideality consistent with 1 :
1 interactions were observed. Approximate values of the thermodynamic
quantities pertaining to the interaction have been derived.
