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The structure of the title hybrid compound, (C 6 H 16 N 2 )[CrO 4 ], has been determined from synchrotron data. The organic cation adopts a chair conformation. The inorganic CrO 4  2- anion is slightly distorted owing to its involvement in N-H⋯O hydrogen-bonding inter-actions with neighbouring trans -cyclo-hexane-1,2-di-ammonium cations, whereby the two Cr-O bonds to the O atoms acting as acceptor atoms for two hydrogen bonds are slightly longer than the other two Cr-O bonds for which only one acceptor inter-action per O atom is observed. In the crystal, cations and anions are packed into layers parallel to (001), held together through the aforementioned N-H⋯O hydrogen bonds.

Crystal structure oftrans-cyclohexane-1,2-diammonium chromate(VI) from synchrotron X-ray diffraction data