The orthorhombic polymorph of diammonium trichromate(VI) decaoxide, α–(NH4)2Cr3O10 |
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| Authors: | Barbara M. Casari Elisabeth Öberg Vratislav Langer |
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| Affiliation: | 1.Department of Chemistry, Inorganic Chemistry,G?teborg University,G?teborg,Sweden;2.Environmental Inorganic Chemistry, Department of Chemical and Biological Engineering,Chalmers University of Technology,G?teborg,Sweden |
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| Abstract: | 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) ? 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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| Keywords: | Ammonium trichromate trichromate polychromate conformation of trichromate ion X-ray diffraction |
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