Di‐8‐hydroxyquinolinium oxopentachloromolybdate(V) (OxineH)2[MoOCl5] (where Oxine = 8‐hydroxyquinoline) has been isolated in pure state and has been characterised by chemical analysis, oxidation state determination, magnetic measurement, spectroscopic investigation and conductivity measurements. Copyright © 1970 Verlag GmbH & Co. KGaA, Weinheim