Structural organization in the trimethylamine iodine monochloride complex

The structure of the complex formed between trimethylamine and iodine monochloride had been redetermined by a combination of neutron powder diffraction and X-ray single crystal diffraction techniques. The structure determined using NPD shows that the geometry of the trimethylamine moiety resembles that in trimethylammonium cations rather than in the free trimethylamine molecule. The structure shows the presence of weak C-D. Cl hydrogen bonds, The I-Cl bond length is in agreement with that derived from an analysis of the pK(b) values of a series of nitrogen bases and previously determined structures containing N center dot center dot center dot ICl fragments.