1. Examples

2. References

In chemistry, the trigonal prismatic molecular geometry describes the shape of compounds where six atoms, groups of atoms, or ligands are arranged around a central atom, defining the vertices of a triangular prism.

Examples

Hexamethyltungsten (W(CH₃)₆) was the first example of a molecular trigonal prismatic complex.^[1] The figure shows the six carbons arranged at the vertices of a triangular prism with the tungsten at the centre. The hydrogens are not shown.

Some other transition metals have trigonal prismatic hexamethyl complexes, including both neutral molecules such as Mo(CH₃)₆ and Re(CH₃)₆ and ions such as {{chem|Ta(CH|3|)|6|−}} and {{chem|Zr(CH|3|)|6|2−}}.^[2]

The complex Mo(S−CH=CH−S)₃ is also trigonal prismatic, with each S−CH=CH−S group acting as a bidentate ligand with two sulfur atoms binding the metal atom.^[2] Here the coordination geometry of the six sulfurs around the molybdenum is similar to that in the extended structure of molybdenum disulfide (MoS₂).

References

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