Acta Crystallographica Section B

Structural Science

Volume 53, Part 2 (April 1997)

short communications

Acta Cryst. (1997). B53, 317-322 [ doi:10.1107/S010876819601381X ]

The perils of Cc revisited

R. E. Marsh

Abstract: The space groups of 98 structures originally reported in Cc are revised. In 75 cases the revised space group is C2/c and the revision entails adding a center of symmetry, usually leading to large changes in bond lengths and angles. In the remaining 23 cases, where the revised space group is Fdd2, R3c or (in one case) I $\overline 4$ c2, the lattice type is changed but no center is added; in these cases the molecular dimensions are effectively unchanged.