Synthesis and crystal structure of a trichromium(VI) decaoxide compound, α–(NH4)2Cr3O10, is reported. The crystal structure has been determined from three dimensional X-ray data collected at low temperature, 173 K. The structure is isomorphous with its Rb and Cs trichromate analogues, orthorhombic, space group Pbca, with a = 11.2558(3), b = 9.3193(3), c = 18.9819(5) Å and Z = 8. The title compound is composed of discrete [Cr3O10]2– chains held together by the counter ion charge and a hydrogen bonding network. The different conformations adopted by trichromate anion within its ammonium, alkali and organic salts are discussed.
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Casari, B.M., Öberg, E. & Langer, V. The orthorhombic polymorph of diammonium trichromate(VI) decaoxide, α–(NH4)2Cr3O10 . J Chem Crystallogr 37, 135–140 (2007). https://doi.org/10.1007/s10870-006-9165-6
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DOI: https://doi.org/10.1007/s10870-006-9165-6