Dihedral Angles:

Diheral angles are a measure of the rotation about a bond.

• For four atoms A-B-C-D, the dihedral angle measures the rotation about the B-C bond.
• It is the angle formed between two planes, the plane defined by A-B-C and the plane defined by B-C-D.
• A positive dihedral angle is a clockwise rotation of the first plane on to the second.
• A negative dihedral angle is a counterclockwise rotation.

Use the following check boxes to add the planes:

You may find it useful to remove the hydrogens to reduce the clutter:

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 red - oxygen
 gray - carbon
 yellow - sulfur
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