Pentagonal planar molecular geometry

In chemistry, the pentagonal planar molecular geometry describes the shape of compounds where five atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a pentagon.

Pentagonal planar molecular geometry
Point groupD5h
Coordination number5
Bond angle(s)72°
μ (Polarity)0


The only two pentagonal planar species known are the isoelectronic (nine valence electrons) ions XeF
and IF2−
.[1] Both are derived from the pentagonal bipyramid with two lone pairs occupying the apical positions and the five fluorine atoms all equatorial.


  1. Housecroft, C. E.; Sharpe, A. G. (2004). Inorganic Chemistry (2nd ed.). Prentice Hall. p. 498. ISBN 978-0130399137.
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