Indium Halides - Anionic Halide Complexes of In(III)

Anionic Halide Complexes of In(III)

The trihalides are Lewis Acids and form addition compounds with ligands. For InF₃ there are few examples known however for the other halides addition compounds with tetrahedral, trigonal bipyramidal and octahedral coordination geometries are known. With halide ions there are examples of all of these geometries along with some anions with octahedrally coordinated indium and with bridging halogen atoms, In₂X₉3− with three bridging halogen atoms and In₂X₇− with just one. Additionally there are examples of indium with square planar geometry in the InX₅2- ion. The square planar geometry of InCl₅2− was the first found for a main group element.