[orgo814]

I'm trying to determine the symmetry elements for dibenzenechromium (eclipsed conformation). my book says it has colinear C6, C3, and C2 axes perpendicular to the rings, six perpendicular C2 axes, and a sigma H plane. I cannot see the C3 axis. How would it have a C3?

Thank you

[Corribus]

C3 is basically the same as two successive C6 rotations (and C2 is three).

[mjc123]

Don't forget the sigma v planes.