Acta Cryst. (2009). C65, o146-o150 [ doi:10.1107/S0108270109003242 ]
Abstract: In 2,4,6,8-tetrakis(4-chlorophenyl)-2,4,6,8-tetraazabicyclo[3.3.0]octane, C28H22Cl4N4, the imidazolidine rings adopt envelope conformations, which are favoured by two equal endo anomeric effects. The molecule lies on a crystallographic twofold axis and molecules are linked into a three-dimensional framework via two C-HCl hydrogen bonds. In 2,4,6,8-tetrakis(4-methoxyphenyl)-2,4,6,8-tetraazabicyclo[3.3.0]octane, C32H34N4O4, one of the methyl groups is disordered over two sets of sites and the same methyl group participates in an intermolecular C-HO hydrogen bond, which in turn causes a considerable deviation from the preferred conformation. There are two unequal inter-ring anomeric effects in the N-C-N groups. Molecules are linked into corrugated sheets by one C-H hydrogen bond and two independent C-HO hydrogen bonds involving methoxy groups.
Formula: C28H22Cl4N4 and C32H34N4O4
Structure factor file (CIF format) (112.0 kbytes)
Structure factor file (CIF format) (251.4 kbytes)
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