Pentagonal bipyramidal molecular geometry
From Infogalactic: the planetary knowledge core
| Pentagonal bipyramidal molecular geometry | |
|---|---|
 |
|
| Examples | IF7 |
| Point group | D5h |
| Steric number | 7 |
| Coordination number | 7 |
| Bond angle(s) | 72°, 90° |
| μ (Polarity) | 0 |
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 bipyramidal molecular geometry).[1] 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.
File:Iodine-heptafluoride-3D-vdW.png
Structure of iodine heptafluoride, an example of a molecule with the pentagonal-bipyramidal coordination geometry.
Examples
- Iodine heptafluoride (IF7) with 7 bonding groups
- Peroxo chromium(IV) complexes, e.g. [Cr(O2)2(NH3)3] where the peroxo groups occupy four of the planar positions.
References
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