Seesaw (chemistry)
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Seesaw molecular geometry
Examples	SF4
Point group	C2V
Steric number	5
Coordination number	4
Bond angle(s)	90°, 120°, 180°
μ (Polarity)	>0

Seesaw is a type of molecular geometry where the central atom has one lone pair of electrons, and there are four bonding groups also connected to that central atom.

Behavior

The seesaw molecules have similar behavior to trigonal bipyramidal, in the fact that it goes through a phase of Berry pseudorotation. The four atoms in motion act as a lever about the central atom, in this case the the four fluorine rotating around the one sulfur. ¹

Examples

The seesaw molecular geometry can be found in the following species.²

• SF₄
• SeF₄
• IF₂O₂^-
• IOF₃
• ClF₄⁺

See also

• Molecular geometry
• AXE method

References

External References

• Chem| Chemistry, Structures, and 3D Molecules
• Indiana University Molecular Structure Center
• Point Group Symmetry| Point Group Symmetry Interactive Examples
• Molecular Modeling
• Animated Trigonal Planar Visual
• [1]

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