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9-(3-Chloropyridin-4-yl)-9 H -carbazole ( 1 ) crystallizes as polytypes made up of layers of one kind with  P ( c )2 1  b  symmetry, in which layer contacts are geometrically non-equivalent (non-OD polytypes). In both polytypes adjacent layers are related by a glide reflection with a plane parallel to (100). In polytype I ( Ic 2 a ), the intrinsic translation vector of the glide reflection is  b /2. In polytype II ( P 2 1 ), the intrinsic translation vector is  s  c /2 with  s =0.771. It is a polytype with a maximum degree of order (MDO) of a family of OD structures. Fragments of the second MDO polytype lead to systematic twinning by reflection at (100). For crystals of both polytypes the absolute structure was determined [Flack parameters −0.03(5) and −0.05(5)]. Despite being of the non-OD type, the formalism of OD theory is applied to achieve a unified description of the symmetry of both polytypes.

OD- and non-OD-polytypism of 9-(3-chloropyridin-4-yl)-9 H -carbazole