Improper Rotation – Allene S4

Improper Rotations – Allene S4

Improper Rotation

An improper rotation consists of two stages. 1) A proper rotation around the Sn axis. 2) Reflection across a plane perpendicular to the Sn axis.

In the case of allene it has a S4 axis. Hence there is a C4 rotation followed by a reflection, shown above.


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