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(CH3)4NI is Silicon tetrafluoride-derived structured and crystallizes in the tetragonal P4/nmm space group. The structure is zero-dimensional and consists of two hydriodic acid molecules and two tetramethylammonium molecules.
N(CH3)4I(OF)2 is Silicon tetrafluoride-derived structured and crystallizes in the monoclinic C2/m space group. The structure is zero-dimensional and consists of four tetramethylammonium molecules and four I(OF)2 clusters. In each I(OF)2 cluster, there are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one I1- atom. The O–I bond length is 1.80 Å. In the second O2- site, O2- is bonded in a single-bond geometry to one I1- atom. The O–I bond length is 1.80 Å. I1- is bonded in a see-saw-like geometry to two O2- and two equivalent F1- atoms. Both I–F bond lengths are 2.06 Å. F1- is bonded in a single-bond geometry to one I1- atom.