How to calculate dihedral (not torsion) angles?

[Paul D. Boyle]

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Antonio (osrisfol at ssmain.uniss.it) wrote:
: The problem is, how to calculate a dihedral angle when the four centers
: defining the two planes are
: not directly connected? For example, if we have a six ring
: molecule:
:                                           1 ---2
:                                          /        \
:                                         6        3
:                                           \       /
:                                           5 -- 4

: and we need the angle between the 1-3-5 and 1-2-3 planes,

Reading Donald Sands' book, "Vectors and Tensors in Crystallography",
ISBN 0-201-07147-9 is a good place to start.  Chapter 2, particularly
section 2-12, will be useful to you.

Paul

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