Tricapped trigonal prismatic molecular geometry

Tricapped trigonal prismatic molecular geometry

Examples	ReH2− 9
Steric number	9
Coordination number	9
μ (Polarity)	0

In chemistry, the tricapped trigonal prismatic molecular geometry describes the shape of compounds where nine atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a triaugmented triangular prism (a trigonal prism with an extra atom attached to each of its three rectangular faces).

It is very similar to the capped square antiprismatic molecular geometry, and there is some dispute over the specific geometry exhibited by certain molecules.

Examples

ReH2−
9 is usually considered to have a tricapped trigonal prismatic geometry, although its geometry is sometimes described as capped square antiprismatic instead.
Ln(H
2O)3+
9 (Ln = La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy)
Th(H
2O)4+
9

Molecular geometry

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 Distorted octahedral

Coordination number 7	Pentagonal bipyramidal

Coordination number 8	Square antiprismatic

Coordination number 9	Tricapped trigonal prismatic Capped square antiprismatic

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