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N,N'-Bis(2,3-dimeth-oxy-benzyl-idene)ethane-1,2-diamine.

ABSTRACT: The title compound, C(20)H(24)N(2)O(4), crystallizes with two half (centrosymmetric) mol-ecules in the asymmetric unit. There are only minor differences between the geometric parameters between these two mol-ecules. The two aromatic rings in both mol-ecules are mutually coplanar.

SUBMITTER: Xue H

PROVIDER: S-EPMC3200920 | biostudies-literature |

REPOSITORIES: biostudies-literature

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N,N'-Bis(3-methoxy-benzyl-idene)ethane-1,2-diamine.

Project description:The mol-ecule of the title bidentate Schiff base ligand, C(18)H(20)N(2)O(2), has twofold crystallographic rotation symmetry, giving one half-mol-ecule per asymmetric unit. It adopts a twisted E configuration with respect to the azomethine C=N bond. The imino group is coplanar with the aromatic ring. The dihedral angle between the two benzene rings is 69.52?(5)°. The meth-oxy group is coplanar with the benzene ring, as indicated by the C-O-C-C torsion angle of -179.56?(8)°. In the unit cell, mol-ecules are linked together by inter-molecular C-H?O hydrogen bonds, forming chains along the a axis; these chains are further stacked down the b axis by both inter-molecular C-H?O and C-H?? inter-actions.

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N,N'-Bis(2-iodo-benzyl-idene)ethane-1,2-diamine.

Project description:The mol-ecule of the title Schiff base compound, C(16)H(14)I(2)N(2), lies across a crystallographic inversion centre. An intra-molecular C-H?I hydrogen bond forms a five-membered ring, producing an S(5) ring motif. The C=N bond is coplanar with the benzene ring and adopts a trans configuration. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. An inter-esting feature of the crystal structure is the short I?N [3.2096?(15)?Å] inter-action, which is significantly shorter than the sum of the van der Waals radii of these atoms. In the crystal structure, mol-ecules are linked into one-dimensional extended chains along the c axis and also into one-dimensional extended chains along the b axis through short inter-molecular I?N inter-actions, forming two-dimensional networks parallel to the bc plane.

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N,N'-Bis(3,5-dichloro-benzyl-idene)-ethane-1,2-diamine.

Project description:The mol-ecule of the title Schiff base compound, C(16)H(12)Cl(4)N(2), lies across an inversion centre and adopts an E configuration with respect to the azomethine C=N bond. The imine groups are coplanar with the aromatic rings. Within the mol-ecule, the planar units are parallel but extend in opposite directions from the dimethyl-ene bridge. In the crystal structure, mol-ecules are linked together by inter-molecular C-H⋯Cl hydrogen bonds along the a axis.

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N,N'-Bis(4-bromo-benzyl-idene)ethane-1,2-diamine.

Project description:The mol-ecule of the title Schiff base compound, C(16)H(14)Br(2)N(2), lies across a crystallographic inversion centre and adopts an E configuration with respect to the azomethine C=N bond. The imino group is coplanar with the aromatic ring. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. The crystal structure is stabilized by inter-molecular C-H⋯π inter-actions and Br⋯Br [3.6307 (4) Å] short contacts.

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N,N'-Bis(3-bromo-benzyl-idene)ethane-1,2-diamine.

Project description:The mol-ecule of the title Schiff base compound, C(16)H(14)Br(2)N(2), lies across a crystallographic inversion centre. The C=N bond adopts a trans configuration. The imino group is coplanar with the benzene ring. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. The inter-esting feature of the structure is the weak Br⋯Br inter-action [3.7501 (2) Å] linking the mol-ecules into chains along the c axis. These chains are stacked along the b axis.

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N,N'-Bis[(E)-2,4,6-trimethyl-benzyl-idene]ethane-1,2-diamine.

Project description:The title compound, C(22)H(28)N(2), which is a double imine derived from ethane-1,2-diamine and mesityl aldehyde, has crystallographic inversion symmetry, with both C=N bonds E configured. The dihedral angle between the mesityl ring system and the imide functional group is 23.89?(17)°.

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Project description:In the title compound, [HgBr(2)(C(22)H(28)N(2)O(6))], the Hg(II) ion is bonded to two Br(-) ions and two N atoms of the chelating Schiff base ligand in a distorted tetra-hedral geometry. The Schiff base ligand adopts an E,E conformation. The dihedral angle between the planes of the two halves of the central N,N'-dimethyl-ethylenediamine part of the ligand is 2.3?(11)°. The crystal studied was twinned by pseudomerohedry [twin law (0-10/-100/00-1)]; the contribution of the minor twin component refined to 0.208?(3).

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N,N'-Bis(4-bromo-2-fluoro-benzyl-idene)ethane-1,2-diamine.

Project description:The mol-ecule of the title Schiff base compound, C(16)H(12)Br(2)F(2)N(2), lies across a crystallographic inversion centre and adopts an E configuration with respect to the azomethine C=N bonds. The imino groups are coplanar with the aromatic rings. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. An inter-esting feature of the crystal structure is the short inter-molecular Br?F inter-actions [3.2347?(16)?Å, which is shorter than the sum of the van der Waals radii of these atoms]. These inter-actions link neighbouring mol-ecules along the c axis. The crystal structure is further stabilized by inter-molecular C-H?N hydrogen bonds.

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N,N'-Bis(3-chloro-2-fluoro-benzyl-idene)ethane-1,2-diamine.

Project description:The mol-ecule of the title centrosymmetric Schiff base compound, C(16)H(12)Cl(2)F(2)N(2), adopts an E configuration with respect to the azomethine C=N bond. The imino groups are coplanar with the aromatic rings. Within the mol-ecule, the planar units are parallel, but extend in opposite directions from the dimethyl-ene bridge. An inter-esting feature of the crystal structure is the short inter-molecular Cl?F [3.1747?(5)?Å] inter-actions, which are shorter than the sum of the van der Waals radii of these atoms. These inter-actions link neighbouring mol-ecules along the b axis. The crystal structure is further stabilized by ?-? inter-actions, with a centroid-centroid distance of 3.5244?(4)?Å.

| S-EPMC2959267 | biostudies-literature

(E,E)-N,N-Bis(2,6-difluoro-benzyl-idene)ethane-1,2-diamine.

Project description:The asymmetric unit of the title compound, C(16)H(12)F(4)N(2), comprises half of the potentially bidentate Schiff base ligand, with an inversion centre located at the mid-point of the central C-C bond. The crystal packing is stabilized by inter-molecular C-H?N and ?-? inter-actions [centroid-centroid distance = 3.6793?(12)?Å and inter-planar spacing = 3.4999?(7)?Å].

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