Capped square antiprismatic molecular geometry

In chemistry, the capped square antiprismatic 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 gyroelongated square pyramid.

Capped square antiprismatic molecular geometry
Point groupC4v
Coordination number9

The gyroelongated square pyramid is a square pyramid with a square antiprism connected to the square base. In this respect, it can be seen as a "capped" square antiprism (a square antiprism with a pyramid erected on one of the square faces).

It is very similar to the tricapped trigonal prismatic molecular geometry, and there is some dispute over the specific geometry exhibited by certain molecules.

Examples
  • ReH2−
    9     is sometimes described as having a capped square antiprismatic geometry, although its geometry is most often described as tricapped trigonal prismatic.
  • [LaCl(H
    2    O)
    7    ]4+
    2    , a lanthanum(III) complex with a La–La bond.[1]
gollark: <@480213740499894283> It might actually be due to a "value ceiling" sort of thing - there's not really anything rarer than a Neglected which is available to the wider DC community - so they can't really ask for anything but several neglecteds.
gollark: Yes, that is indeed true.
gollark: They're certainly fairer than prizes!
gollark: (their descendants, it is important to note, are *not* alts)
gollark: Because only spriters have the CB SAs.

References
  1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 917. ISBN 978-0-08-037941-8.
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