Isotype Strukturen einiger Hexaamminmetall(II)-halogenide von 3d-Metallen: [V(NH3)6]I2, [Cr(NH3)6]I2, [Mn(NH3)6]Cl2, [Fe(NH3)6]Cl2, [Fe(NH3)6]Br2, [Co(NH3)6]Br2 und [Ni(NH3)6]Cl2 |
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| Authors: | Ralf Eßmann Guido Kreiner Anke Niemann Dirk Rechenbach Axel Schmieding Thomas Sichla Uwe Zachwieja Herbert Jacobs |
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| Abstract: | The Structures of some Hexaammine Metal(II) Halides of 3 d Metals: V(NH3)6]I2, Cr(NH3)6]I2, Mn(NH3)6]Cl2, Fe(NH3)6]Cl2, Fe(NH3)6]Br2, Co(NH3)6]Br2 and Ni(NH3)6]Cl2 Crystals of yellow V(NH3)6]I2 and green Cr(NH3)6]I2 were obtained by the reaction of VI2 and CrI2 with liquid ammonia at room temperature. Colourless crystals of Mn(NH3)6]Cl2 were obtained from Mn and NH4Cl in supercritical ammonia. Colourless transparent crystals of Fe(NH3)6]Cl2 and Fe(NH3)6]Br2 were obtained by the reaction of FeCl2 and FeBr2 with supercritical ammonia at 400°C. Under the same conditions orange crystals of Co(NH3)6]Br2 were obtained from Co2(NH2)3(NH3)6]Br3. Purple crystals of Ni(NH3)6]Cl2 were obtained by the reaction of NiCl2 · 6H2O and NH4Cl with aqueous NH3 solution. The structures of the isotypic compounds (Fm3 m, Z = 4) were determined from single crystal diffractometer data (see “Inhaltsübersicht”). All compounds crystallize in the K2PtCl6] structure type. In these compounds the metal ions have high-spin configuration. The orientation of the dynamically disordered hydrogen atoms of the ammonia ligands is discussed. |
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| Keywords: | Hexaammine metal(II) halides [M(NH3)6]X2 single crystal structure determinations |
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