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Pentagonal planar molecular geometry
Pentagonal planar molecular geometry
Examples	[XeF5]−
Point group	D5h
Coordination number	5
Bond angle(s)	72°
μ (Polarity)	0

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.

Examples

The only two pentagonal planar species known are the isoelectronic (nine valence electrons) ions [XeF₅]⁻ (pentafluoroxenate(IV)) and [IF₅]²⁻ (pentafluoroiodate(III)).^[1] Both are derived from the pentagonal bipyramid with two lone pairs occupying the apical positions and the five fluorine atoms all equatorial.

References

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

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

[1]

Molecular geometry
VSEPR theory Coordination number
Coordination number 2	Linear Bent
Coordination number 3	Trigonal planar Trigonal pyramidal T-shaped
Coordination number 4	Tetrahedral Square planar Seesaw
Coordination number 5	Trigonal bipyramidal Square pyramidal Pentagonal planar
Coordination number 6	Octahedral Trigonal prismatic Pentagonal pyramidal
Coordination number 7	Pentagonal bipyramidal Capped octahedral Capped trigonal prismatic
Coordination number 8	Square antiprismatic Dodecahedral Bicapped trigonal prismatic
Coordination number 9	Tricapped trigonal prismatic Capped square antiprismatic
Category

Pentagonal planar molecular geometry

Examples	[XeF₅]⁻
Point group	D_5h
Coordination number	5
Bond angle(s)	72°
μ (Polarity)	0