Article · Wikipedia archive · Last revised Jun 4, 2026

Pentagonal pyramidal molecular geometry

In chemistry, pentagonal pyramidal molecular geometry describes the shape of compounds where in six atoms or groups of atoms or ligands are arranged around a central atom, at the vertices of a pentagonal pyramid. It is one of the few molecular geometries with uneven bond angles.

Last revised
Jun 4, 2026
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Pentagonal pyramidal molecular geometry
ExamplesXeOF
5
Point groupC5v
Coordination number6
Bond angle(s)90°, 72°
μ (Polarity)>0

In chemistry, pentagonal pyramidal molecular geometry describes the shape of compounds where in six atoms or groups of atoms or ligands are arranged around a central atom, at the vertices of a pentagonal pyramid. It is one of the few molecular geometries with uneven bond angles.1

AX6E1 source ↗

Examples

  • XeOF
    5
    2
  • IOF2−
    5
    23
References

References

  1. Baran, Enrique J. (2008). "Mean amplitudes of vibration of molecules and ions with interhalogen bonds and related species". Journal of Fluorine Chemistry. 129 (11): 1060–1072. Bibcode:2008JFluC.129.1060B. doi:10.1016/j.jfluchem.2008.06.016.
  2. Baran, E. (2000). "Mean amplitudes of vibration of the pentagonal pyramidal XeOF
    5
    and IOF2−
    5
    anions". J. Fluorine Chem. 101: 61–63. doi:10.1016/S0022-1139(99)00194-3.
  3. Housecroft, Catherine E.; Sharpe, Alan G. (2005). Inorganic Chemistry (2nd ed.). Pearson Prentice-Hall. p. 485. ISBN 0130-39913-2.

Pentagonal pyramid, Wolfram MathWorld