In7Cl9-A New "Old" Compound in the System In-Cl

Neither In3Cl4 nor In4Cl5 accurately defines a phase whose existence was predicted by thermoanalytic methods. In fact a more apt formula is In7Cl9, for the phase which is prepared from InCl/InCl3 mixtures by sintering for 14 days at 220–250°C. The structure of the compound (part of which is shown on the right—In: small circles; Cl: large circles) reveals interesting crystallographic relationships to that of α‐InCl and is important in the discussion on stereochemical activity of cations with ns2 configuration.