Iridium Monochloride, IrCl

Iridium Monochloride, IrCl, is obtained by decomposition of the dichloride, IrCl₂, by ignition in chlorine at about 790° C., its range of stability being 773° to 798° C. in an atmosphere of chlorine. It yields coppery red crystals of density 10.18, which are insoluble in bases and acids, even in concentrated sulphuric acid.