Trigonal prismatic molecular geometry

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Trigonal prismatic molecular geometry
Trigonal prismatic molecular geometry
Examples W(CH3)6
Steric number 6
Coordination number 6
Bond angle(s) 95°, 85°
μ (Polarity) 0

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.


Hexamethyltungsten (W(CH3)6) was the first example of a molecular trigonal prismatic complex.[1]

Some other transition metals have trigonal prismatic hexagonal complexes, including both neutral molecules such as Mo(CH3)6 and Re(CH3)6 and ions such as Ta(CH3)6 and Zr(CH3)62−.[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)


  1. ^ Housecroft C.E. and Sharpe A.G., Inorganic Chemistry (2nd ed., Pearson Prentice-Hall 2005) p.725 ISBN 0130-39913-2
  2. ^ a b Housecroft and Sharpe p.545