Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 9 (September 2007)

organic compounds

gg3104 scheme

Acta Cryst. (2007). C63, o535-o537 [ doi:10.1107/S0108270107035408 ]

Monoclinic and orthorhombic polymorphs of 4,4',6,6'-tetrachloro-2,2'-(piperazine-1,4-diyldimethylene)diphenol

K. Kubono and K. Yokoi

Abstract: The title compound, C₁₈H₁₈Cl₄N₂O₂, crystallizes as monoclinic and orthorhombic polymorphs from CHCl₃-CH₃OH solution. In both polymorphic forms, the molecule lies on a crystallographic centre of inversion (at the piperazine ring centroid) and exhibits an intramolecular O-HN hydrogen bond. In the monoclinic polymorph (space group P2₁/c), the molecules are linked by intermolecular C-HCl hydrogen bonds into a ribbon sheet built from R₈⁸(34) rings. In the orthorhombic polymorph (space group Pbcn), the molecules are linked by intermolecular C-HO hydrogen bonds into a ribbon sheet of R₆⁶(34) rings. The sheets in the orthorhombic polymorph are crosslinked into a three-dimensional framework by [pi] - [pi] stacking interactions.

Formula: C₁₈H₁₈Cl₄N₂O₂ and C₁₈H₁₈Cl₄N₂O₂


	Structure factor file (CIF format) (83.7 kbytes) [ doi:10.1107/S0108270107035408/gg3104Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (105.4 kbytes) [ doi:10.1107/S0108270107035408/gg3104IIsup3.hkl ] Contains datablock II

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