Materials Data on HI by Materials Project
HI1 is alpha carbon monoxide-like structured and crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of sixteen hydriodic acid molecules. H1+ is bonded in a single-bond geometry to one I1- atom. The H–I bond length is 1.64 Å. I1- is bonded in a single-bond geometry to one H1+ atom.