|View down 2 axis||View down -4 axis||View down 2′ axis|
The two double bonds in allene results in two methylene groups at 90 degrees to each other. The main symmetry axis is -4, colinear with a twofold rotation axis. Perpendicular to the -4 axis are 2 twofold axis which are bisected by two mirror planes.
The point-group symmetry for this molecule is given the crystallographic symbol -4 2 m.
|© Copyright 1997-2006. Birkbeck College, University of London.||Author(s): Jeremy Karl Cockcroft|