Tricapped trigonal prismatic molecular geometry

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).

Tricapped trigonal prismatic molecular geometry
ExamplesReH2−
9
Point groupD3h
Coordination number9
μ (Polarity)0

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
    2    O)3+
    9     (Ln = La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy)
  • Th(H
    2    O)4+
    9
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