THE STRUCTURES OF SOME HEXAAMMINE METAL(I I) HALIDES OF 3D METALS - [V(NH3)(6)]I-2, [CR(NH3)(6)]I-2, [MN(NH3)(6)]CL-2, [FE(NH3)(6)]CL-2, FE(NH3)(6)]BR-2, [CO(NH3)(6)]BR-2, AND [NI(NH3)(6)CL-2

Crystals of yellow [V(NH3)(6)]I-2 and green [Cr(NH3)(6)]I-2 were obtai ned by the reaction of VI2 and CrI2 with liquid ammonia at room temper ature. Colourless crystals of [Mn(NH3)(6)]Cl-2 were obtained from Mn a nd NH4Cl in supercritical ammonia. Colourless transparent crystals of [Fe(NH3)(6)]Cl-2 and [Fe(NH3)(6)]Br-2 were obtained by the reaction of FeCl2 and FeBr2 with supercritical ammonia at 400 degrees C. Under th e same conditions orange crystals of [Co(NH3)(6)]Br-2 were obtained fr om [Co-2(NH2)(3)(NH3)(6)]Br-3. Purple crystals of [Ni(NH3)(6)]Cl-2 wer e obtained by the reaction of NiCl2 . 6H(2)O and NH4Cl with aqueous NH 3 solution. The structures of the isotypic compounds (Fm3m, Z = 4) wer e determined from single crystal diffractometer data (see ''Inhaltsube rsicht''). All compounds crystallize in the K-2[PtCl6] structure type. In these compounds the metal ions have high-spin configuration. The o rientation of the dynamically disordered hydrogen atoms of the ammonia ligands is discussed.