Rb2[B12(OH)12]·2H2O and Rb2[B12(OH)12]·2H2O2: Hydrate and perhydrolate of rubidium dodecahydroxo-closo-dodecaborate |
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Authors: | Thomas Schölkopf |
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Institution: | Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany |
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Abstract: | The orthorhombically crystallizing salts Rb2B12(OH)12]·2H2O (a = 1576.81(9), b = 813.08(5), c = 1245.32(7) pm) and Rb2B12(OH)12]·2H2O2 (a = 1616.54(9), b = 814.29(5), c = 1260.12(7) pm) could be prepared from Rb2B12H12] and hydrogen peroxide. Both crystal structures were determined by X-ray single crystal diffraction and refined in the space group Cmce. They are not isostructural to the other compounds containing icosahedral dodecahydroxo-closo-dodecaborate dianions B12(OH)12]2− and potassium, rubidium or cesium cations already known to literature, but both title compounds crystallize quasi-isotypically exhibiting Rb+ cations in 10-fold oxygen coordination. The hydrogen peroxide adduct (Rb2B12(OH)12]·2H2O2) is explosive on shock and heat, while the hydrate (Rb2B12(OH)12]·2H2O) is not. |
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Keywords: | Dodecahydroxo-closo-dodecaborates Crystal structure Single crystal X-ray diffraction Explosive hydrogen-peroxide adducts Hydrates |
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