Pentagonal bipyramidal molecular geometry

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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.

Structure of iodine heptafluoride, an example of a molecule with the pentagonal-bipyramidal coordination geometry.



  1. ^ Cotton, F. Albert; Wilkinson, Geoffrey; Murillo, Carlos A.; Bochmann, Manfred (1999), Advanced Inorganic Chemistry (6th ed.), New York: Wiley-Interscience, ISBN 0-471-19957-5 

External links[edit]

  • [1] – Images of IF7
  • 3D Chem – Chemistry, Structures, and 3D Molecules
  • IUMSC – Indiana University Molecular Structure Center