| Abstract: | Derivatives of the Fluorite Type: Fe(NH3)6]TaF6]2 and Ni(NH3)6]TaF6]2 Light blue single crystals of Fe(NH3)6]TaF6]2 and Ni(NH3)6]TaF6]2 are obtained from 36 : 1 : 6 molar mixtures of (NH4)F, iron/nickel and tantalum powders, respectively, in sealed Monel metal ampoules at 400 °C. They both crystallize isotypic with Co(NH3)6]PF6]2 (cubic, Fm-3m, Z = 4, a = 1259.0(2)/1260.4(2) pm) in a structure that can be derived from the basic fluorite-type of structure according to Ca]F]2≡Fe(NH3)6]TaF6]2, for example. |
