Samiksha Jaiswal (Editor)

Pentagonal bipyramidal molecular geometry

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Examples
  
IF7

Steric number
  
7

Bond angle(s)
  
72°, 90°

Point group
  
D5h

Coordination number
  
7

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 bipyramidal 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.

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

    Pentagonal bipyramidal molecular geometry Wikipedia
    (Text) CC BY-SA