Pentagonal bipyramidal molecular geometry
In chemistry, a pentagonal bipyramid (or dipyramid) is a molecular geometry with one atom at the centre with seven ligands at the corners of a pentagonal dipyramid. A perfect pentagonal bipyramid belongs to the molecular point group D5h.
The pentagonal bipyramid is a case where bond angles surrounding an atom are not identical (see also Trigonal bipyramid molecular geometry). Other seven coordinate geometries include the mono-capped octahedron and mono-capped trigonal prism. A variety of transition metal complexes adopt heptacoordination, but the symmetry is usually lower than D5h.
- Iodine heptafluoride (IF7) with 7 bonding groups
- Peroxo Cr(IV)-complexes, e.g. [Cr(O2)2(NH3)3] where the peroxo groups occupy four of the planar positions.
-  - Images of IF7
- 3D Chem - Chemistry, Structures, and 3D Molecules
- IUMSC - Indiana University Molecular Structure Center