A monoclinic polymorph of 4,4′-dichloro-2,2′-(piperazine-1,4-diyldimethylene)diphenol
نویسندگان
چکیده
The titile compound, C(18)H(20)Cl(2)N(2)O(2), crystallizes as a monoclinic form in the space group P2(1)/n, with Z' = 1/2. It is polymorphic with the previously reported orthorhombic form [Kubono, Tsuno, Tani & Yokoi (2008). Acta Cryst. E64, o2309]. In the present polymorph, the mol-ecule lies on a crystallographic inversion centre at the piperazine ring centroid. An intra-molecular O-H⋯N hydrogen bond forms an S(6) ring motif. Inter-molecular C-H⋯O hydrogen bonding generates a C(5) chain motif propagating along the b axis, forming sheets parallel to (02) with a first-level graph set S(6)C(5)R(6) (6)(34).
منابع مشابه
4,4′-Dichloro-2,2′-(piperazine-1,4-diyldimethylene)diphenol
In the titile compound, C(18)H(20)Cl(2)N(2)O(2), the piperazine ring adopts a chair conformation. The mol-ecule has a non-crystallographic inversion centre in the middle of the piperazine ring at approximate position (3/4, 1/8, 3/8). There are intra-molecular O-H⋯N hydrogen bonds forming S(6) ring motifs. Inter-molecular C-H⋯O hydrogen bonds generate anti-parallel C(5) chain motifs propagating ...
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The title compound, C(20)H(20)Br(2)N(2)O(2), a tetra-dentate Schiff base, is the enanti-omerically pure R,R-diastereomer of four possible stereoisomers. The mol-ecular structure reveals two strong intra-molecular O-H⋯N hydrogen bonds between the hy-droxy O atom and the imino N atom, which each generate S(6) rings. In the crystal, mol-ecules are stacked in columns along the a axis; when viewed d...
متن کامل4,4′-[Piperazine-1,4-diylbis(propylenenitrilomethylidyne)]diphenol
In the title mol-ecule, C(24)H(32)N(4)O(2), the piperazine ring adopts a chair conformation and the dihedral angle between the two benzene rings is 35.4 (1)°. In the crystal structure, inter-molecular O-H⋯N hydrogen bonds link mol-ecules into chains along [001].
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The striking resemblance of the rhombohedral and monoclinic forms of the title molecule to beta- and gamma-quinol provides a crystal engineering approach to new polymorphic systems.
متن کامل(E,E)-4,4′-Dichloro-2,2′-[azinobis(phenylmethylidyne)]diphenol
The title compound, C(26)H(18)Cl(2)N(2)O(2), was synthesized by the reaction of (5-chloro-2-hydroxy-phen-yl)(phen-yl)methanone with hydrazine hydrate. The mol-ecule possesses a crystallographically imposed centre of symmetry at the mid-point of the N-N bond. The conformation of the mol-ecule is stabilized by an intra-molecular O-H⋯N hydrogen bond.
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عنوان ژورنال:
دوره 64 شماره
صفحات -
تاریخ انتشار 2008