The indicated nine‐electron clusters of scandium and zirconium are formed in transport reactions at 880/900°C and 750/600°C, respectively. Sc7Cl12 (R¯3, a – 12.959(2), c – 8.825(2), Z – 3) can be described as c.c.p. Sc6Cl12 clusters with isolated metal atoms in all octahedral interstices or as Sc3+(Sc6Cl6iCl6i−a) 3− with Sc3+ in Cli octahedra between Sc6Cl 123− sheets. Metal‐metal distances within the cluster are 3.201−3.230(2) Å. Zr6Cl12iCl 6/3a crystallizes in the Ta6Cl15 structure (Ia3d, a – 21.141(3) Å, Z – 16) with d(ZrZr) = 3,199–3.214(4) Å. Apparent residual electron density is found in the center of both clusters, amounting to Z∼7.6 (Sc) and ∼6 (Zr) based of refinement of oxygen in these positions. The effect is thought to probably arise from errors in the diffraction data rather than partial incorporation of light nonmetal atoms such as oxygen or fluorine. Observed metal‐metal distances are compared with those in other clusters.
|Number of pages||9|
|Journal||Zeitschrift fur Anorganische und Allgemeine Chemie|
|Publication status||Published - 1982|
ASJC Scopus subject areas
- Inorganic Chemistry