The crystal structure of In I In III I 4 (Indium-diiodide) has been determined by single crystals X-ray methods. The compound crystallized with a GaCl 2 -type arrangement in the orthorhombic space group Pnna (lattice constants: a = 842.7(3) pm, b = 1096.5(3) pm, c = 1117.3(3) pm). Coordination polyhedra and bond lengths are discussed in comparison with other In iodides.
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Horst P. Beck (1984) studied this question.