See here for definition of polar point group:
http://pd.chem.ucl.ac.uk/pdnn/symm2/polar1.htm .
SG P321 is in PG 32 which has a unique point where the axes intersect so is
not polar.
Note that non-centrosymmetric non-enantiomorphic PGs m, mm2, 3m, 4mm and
6mm are also polar, so it's not just
herman.schreu...@sanofi.com wrote:
Polar space groups have none or a single rotation axis, e.g. P1,
P2x, P3x, P4x, P6x. Otherwise Tims argument is valid.
Dear Herman,
Is there really a general definition what a 'polar space group' is?
For example, SG P321 would have more than a single
Dear Natalia,
First a quick correction to avoid confusion: P2(1)2(1)2(1) is not polar. Polar
space groups have none or a single rotation axis, e.g. P1, P2x, P3x, P4x, P6x.
Otherwise Tims argument is valid.
In coot, I would switch on symmetry and use a fairly large box and see whether
