The crystal structure of indium diiodide, indium(I) tetraiodoindate(III), In[InI4]

The crystal structure of the title compound has been determined by the heavy atom method. The crystals are orthorhombic, space group Pnna, with unit cell dimensions a = 8.525(5) Å, b = 10.969(9) Å,c = 11.162(8) Å, Z = 4; R = 0.043 for 807 unique ‘observed’ reflections. The structure consists of InI4− anions (r(nI-I) = 2.714 Å (av.)) and In+ cations. A value is derived for the ionic radius of In+. Indium dichloride is not isomorphous with In[Inl4].