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| View down 2 axis | View down -4 axis | View down 2′ axis |
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| 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.
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| © Copyright 1997-2006. Birkbeck College, University of London. | Author(s): Jeremy Karl Cockcroft |