Capped square antiprismatic molecular geometry

Square antiprisms can be capped on both square faces, giving bicapped square antiprismatic molecular geometry. The bicapped square antiprismatic atoms surrounding a central atom define the vertices of a gyroelongated square bipyramid. The symmetry group of this object is D4d. Examples: • B10H12, defined by the B10 framework • [AsRh10(CO)22]3− and [SRh10(CO)22]2−, defined by the Rh10 framework, which encapsulates the main group atoms As and S • [TlSn8]3−, a zintl ion ==References==