The see-saw shape maximizes the bond angles of the lone pair of electrons and the other atoms in the molecule.
Molecular geometry of the trigonal bipyramidal structures.
Number of lone pairs geometry bond angles
0 Trigonal Bipyramidal 90 and 120
1 rocker 90 and 120
2 T-shape 90
3 Linear 180
February 3, 2021
2.9C2: Trigonal Bipyramidal Structures – Chemistry LibreTexts
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The triangular bipyramid can be referred to as a delta-shaped hexahedron for consistency with the other bodies in the series, although in this case the “deltaids” are triangles instead of kites, since the angle depends on the Dihedral has 180 degrees.
No, seesaw and triangular pyramid are not the same. The seesaw shape has a lone pair in the equatorial position, while the triangular pyramid shape has no lone pair.
Seesaw shaped (AX4E)
This shape is caused by a lone pair of electrons on the central atom. An example of a see-saw molecule is sulfur tetrafluoride, or SF4. Sulfur is the central atom, two fluorine atoms are in the equatorial plane and two in the axial plane.
Due to the greater repulsion of a lone pair, it is one of the equatorial atoms that is replaced by a lone pair. The geometry of the molecule is called a distorted tetrahedron or seesaw.
Rocker geometry is a form of molecular geometry in which the central atom has a lone pair of electrons and is coupled to four bonding groups. AX4E is an example of a seesaw-shaped molecule.
Molecular Geometry and Bond Angles of SF4
The molecular geometry of SF4 is a seesaw with a valence electron pair. The nature of the molecule is polar. These atoms form a trigonal-bipyramidal shape.
In chemistry, a trigonal bipyramid is a molecular geometry with one atom in the center and 5 other atoms at the corners of a triangular bipyramid.
Trigonal bipyramidal (sp3d) is the form of SF4 with one equatorial position occupied by a lone pair of electrons. It has a seesaw shape as it contains four bond pairs and one lone pair. The equatorial F atoms are 120 apart, so the axial/equatorial bond angle is 90 degrees. Was this answer helpful?
The chlorine atoms are as far apart as possible at almost 90o and 120obond angles. This is trigonal bipyramid geometry. Trigonal bipyramidal geometry is characterized by 5 pairs of electrons.
The SF4 molecule has a bipyramidal, trigonal geometry form because it contains four fluorine atoms. There are four S-F bonds on the molecular geometry of SF4. After linking the four fluorine atoms in the bipyramidal trigonal form, it keeps the trigonal bipyramidal structure.
Consequently, SF4 has a trigonal-bipyramidal molecular geometry.