The three mixed-metal oxochromates(VI) Cd(Hg I 2 ) 2 (Hg II ) 3 O 4 (CrO 4 ) 2 , Cd(Hg II ) 4 O 4 (CrO 4 ), and Zn(Hg II ) 4 O 4 (CrO 4 ) were grown under hydrothermal conditions. Their crystal structures were determined from single-crystal X-ray diffraction data. The crystal-chemical features of the respective metal cations are characterised, with a linear coordination for mercury atoms in oxidation states +I and +II, octahedral coordination spheres for the divalent zinc and cadmium cations

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... a tetrahedral configuration of the oxochromate(VI) anions. In the crystal structures the formation of two subunits is apparent, viz. a mercury-oxygen network and a network of cadmium (zinc) cations that are directly bound to the oxochromate(VI) anions. An alternative description of the crystal structures based on oxygen-centred polyhedra is also given.