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A centrosymmetric monoclinic polymorph of N,N-bis-(pyridin-3-yl-methyl-idene)benzene-1,4-diamine.

ABSTRACT: The complete molecule of the title compound, C(18)H(14)N(4), is generated by the application of a centre of inversion. The dihedral angle between the central benzene ring and the pyridine ring is 31.88 (7)°. In the crystal, mol-ecules are stacked in columns along the c axis and several inter-molecular π-π inter-actions are present between the six-membered rings, the shortest centroid-centroid distance being 3.937 (2) Å. The structure reported herein represents a centrosymmetric polymorph of the previously reported non-centrosymmetric (P2(1)) form [Kim et al. (2005 ▶). Bull. Korean Chem. Soc.26, 892-898].

SUBMITTER: Ha K

PROVIDER: S-EPMC3200937 | biostudies-literature | 2011 Sep

REPOSITORIES: biostudies-literature

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A centrosymmetric monoclinic polymorph of N,N-bis-(pyridin-3-yl-methyl-idene)benzene-1,4-diamine.

Ha Kwang K

Acta crystallographica. Section E, Structure reports online 20110806 Pt 9

The complete molecule of the title compound, C(18)H(14)N(4), is generated by the application of a centre of inversion. The dihedral angle between the central benzene ring and the pyridine ring is 31.88 (7)°. In the crystal, mol-ecules are stacked in columns along the c axis and several inter-molecular π-π inter-actions are present between the six-membered rings, the shortest centroid-centroid distance being 3.937 (2) Å. The structure reported herein represents a centrosymmetric polymorph of the ...[more]

PMID: 22058912

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A third polymorph of N,N'-bis-(pyridin-2-yl)benzene-1,4-diamine.

Project description:A third polymorph of the title compound, C(16)H(14)N(4), has been obtained. The mol-ecule adopts a non-planar conformation with an E configuration at the two partially double exo C N bonds of the 2-pyridyl-amine units. Like in the triclinic form [Bensemann et al. (2002 ▶). New J. Chem.26, 448-456], the recognition process between 2-pyridyl-amine units takes place through formation of a cyclic R(2) (2)(8) hydrogen-bond motif, leading to the creation of tapes parallel to [001].

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A monoclinic polymorph of 1,3-bis-(2-pyridylamino-meth-yl)benzene.

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4-[(2-Hy-droxy-benzyl-idene)amino]-N-(5-methyl-isoxazol-3-yl)benzene-sulfonamide: a monoclinic polymorph.

Project description:The title compound, C(17)H(15)N(3)O(4)S, is a monoclinic polymorph with space group P2(1)/c of the previously reported triclinic form in P [Subashini et al. (2009 ▶). J. Chem. Crystallogr.39, 112-116]. In both polymorphs, intra-molecular O-H⋯N hydrogen bonds and dimer formation via a pair of inter-molecular N-H⋯N hydrogen bonds with an R(2) (2)(8) motif are observed. The two polymorphs differ in the next level of supra-molecular organization involving C-H⋯O hydrogen bonds with varied packing and different conformations.

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