STRUCTURAL PRINCIPLES IN 7-COORDINATE SUBGROUP COMPOUNDS - THE COMPLEX ANIONS MOF7-, WF7-, AND REOF6-

Which coordination polyhedron occurs for compounds with coordination number seven? For d0 subgroup compounds the principle of the highest possible symmetry holds; in other words, capped octahedra result for complexes with seven identical ligands and when the interionic forces can be neglected. This is in sharp contrast to the analogous main group compounds, which form pentagonal bipyramids. When subgroup compounds contain one larger ligand and six smaller ones, pentagonalbipyramidal structures occur. Copyright © 1994 by VCH Verlagsgesellschaft mbH, Germany