Iron oxychloride is the inorganic compound with the formula FeOCl.

This purple solid adopts a layered structure, akin to that of cadmium chloride.

The solid intercalates electron donors such as tetrathiafulvalene and even pyridine to give mixed valence charge-transfer salts.

Intercalation is accompanied by a marked increase in electrical conductivity and a color change to black.

[2] FeOCl is prepared by heating iron(III) oxide with ferric chloride at 370 °C (698 °F) over the course of several days:[2] Alternatively, FeOCl may be prepared by the thermal decomposition of FeCl3⋅6H2O at 220 °C (428 °F) over the course of one hour:[3] This inorganic compound–related article is a stub.