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2,2-Dimethyl-N,N'-bis-(4-nitro-benzyl-idene)propane-1,3-diamine.

ABSTRACT: In the title compound, C(19)H(20)N(4)O(4), a potential bidentate Schiff base ligand, each imino (C=N) functional group is coplanar with the adjacent benzene ring. The two benzene rings form a dihedral angle of 10.52 (6)°. Inter-molecular C-H⋯O contacts link neighbouring mol-ecules into supra-molecular array with an R(2) (2)(32) ring motif and a C-H⋯π contact is also present.

SUBMITTER: Fun HK

PROVIDER: S-EPMC2960098 | biostudies-literature |

REPOSITORIES: biostudies-literature

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N,N'-Bis-(2,4-dichloro-benzyl-idene)-2,2-dimethyl-propane-1,3-diamine.

Project description:The mol-ecule of the title Schiff base compound, C(19)H(18)Cl(4)N(2), has crystallographic twofold rotation symmetry, with one C atom lying on the rotation axis. The dihedral angle between the two symmetry-related benzene rings is 84.70?(2)°. The plane of the -C=N-C- group is twisted away from the benzene ring by 7.5?(1)°. In the crystal structure, weak inter-molecular Cl?Cl [3.4851?(3)?Å] contacts link neighbouring mol-ecules into a two-dimensional network parallel to the bc plane.

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N,N'-Bis(4-chloro-benzyl-idene)-2,2-dimethyl-propane-1,3-diamine.

Project description:The title compound, C(19)H(20)Cl(2)N(2), is a potential bidentate Schiff base ligand. Intra-molecular C-H?N hydrogen bonds form five-membered rings, generating S(5) ring motifs. Each imino functional group is coplanar with its adjacent benzene ring; the two benzene rings form a dihedral angle of 51.30?(4)°. An inter-esting feature of the crystal structure is weak inter-molecular Cl?Cl [3.4752?(4)?Å] and Cl?N [3.2927?(9)?Å] inter-actions. Inter-molecular Cl?N inter-actions link mol-ecules into dimers with R(2) (2)(22) ring motifs. The crystal structure is further stabilized by weak ?-? [centroid-centroid distances = 3.6970?(6)-3.8560?(6)?Å] inter-actions.

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N,N'-Bis(4-bromo-benzyl-idene)-2,2-dimethyl-propane-1,3-diamine.

Project description:The mol-ecule of the title compound, C(19)H(20)Br(2)N(2), is a potential bidentate Schiff base ligand. The two benzene rings are inclined at a dihedral angle of 30.85?(8)°. An inter-esting feature of the crystal structure is a weak inter-molecular Br?Br [3.4752?(4)?Å] inter-action which is shorter than the sum of the van der Waals radii of the Br atoms and links neighbouring mol-ecules into chains along the c axis. The crystal structure is further stabilized by inter-molecular C-H?? inter-actions.

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N,N'-Bis(2,3-dimethoxy-benzyl-idene)propane-1,3-diamine.

Project description:The title compound, C(21)H(26)N(2)O(4), adopts an E configuration with respect to the azomethine C=N bonds. The dihedral angle between the two rings is 8.16?(8)°. The crystal structure is stabilized by weak inter-molecular C-H?O inter-actions.

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{4,4'-Dimethyl-2,2'-[(2,2-dimethyl-propane-1,3-di-yl)bis-(nitrilo-methanylyl-idene)]diphenolato}nickel(II) monohydrate.

Project description:In the title compound, [Ni(C(21)H(24)N(2)O(2))]·H(2)O, both the complex mol-ecule and the water mol-ecule lie on a twofold rotation axis. The Ni(II) ion is coordinated in a distorted square-planar geometry by the tetra-dentate ligand. The dihedral angle between the two symmetry-related benzene rings is 47.12?(8)°. In the crystal, pairs of symmetry-related O-H?O hydrogen bonds form R(2) (2)(6) ring motifs. In addition, there are weak inter-molecular C-H?O hydrogen bonds, and ?-? stacking inter-actions with a centroid-centroid distance of 3.4760?(8)?Å.

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[N,N'-Bis(2,6-dichloro-benzyl-idene)propane-1,3-diamine-?(2)N,N']dibromidozinc.

Project description:In the title compound, [ZnBr(2)(C(17)H(14)Cl(4)N(2))], the Zn(II) ion is bonded to two bromide ions and two N atoms of the diimine ligand and displays a moderately distorted tetra-hedral coordination geometry. The Schiff base ligand acts as a chelating ligand and coordinates to the Zn(II) atom via two N atoms.

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N,N'-Bis(5-bromo-2-hydroxy-benzyl-idene)-2,2-dimethylpropane-1,3-diamine.

Project description:The crystal structure of the title Schiff base compound, C(19)H(20)Br(2)N(2)O(2), contains two crystallographically independent mol-ecules (A and B) in the asymmetric unit, with similar conformations. Intra-molecular O-H?N (× 4) and C-H?N (× 5) hydrogen bonds form six- and five-membered rings, producing S(6) and S(5) ring motifs, respectively. One of the N atoms in mol-ecule A acts as a trifurcated acceptor, the rest of the N atoms being bifurcated acceptors. The dihedral angles between the benzene rings in mol-ecules A and B are 47.83?(17) and 61.11?(17)°, respectively. The mol-ecular conformation is stabilized by intra-molecular O-H?N and C-H?N hydrogen bonds. The short distances between the centroids of the benzene rings [3.7799?(19)-3.890?(2)?Å] indicate the existence of ?-? inter-actions. In addition, the crystal structure is further stabilized by an inter-molecular C-H?O hydrogen bond, C-H?? inter-actions, and short inter-molecular Br?Br and Br?O contacts [3.4786?(5) and 3.149?(3)?Å, respectively].

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1,3-Bis[(4-nitro-benzyl-idene)amino-oxy]propane.

Project description:The complete molecule of title compound, C(17)H(16)N(4)O(6), is generated by a crystallographic twofold axis. Within the mol-ecule, the two benzene units are approximately perpen-dicular, making a dihedral angle of 85.91?(4)°. In the crystal, mol-ecules are linked into a three-dimensional network by C-H?O hydrogen bonds and short O?O and N?O inter-actions, with distances of 2.998?(2) and 2.968?(3)?Å, respectively.

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N,N'-Bis(2,6-dichloro-benzyl-idene)propane-1,2-diamine.

Project description:In the title Schiff base, C(17)H(14)Cl(4)N(2), the atoms of one of the 2,6-dichloro-benzyl-idene units and the central 1,2-diamino-propane grouping are disordered over two sets of sites in a 0.8838 (12):0.1162 (12) ratio. The dihedral angles between the ordered benzene ring and its disordered counterparts are 57.41 (12) and 54.8 (6)° for the major and minor disorder components, respectively. The crystal studied was a racemic twin, the refined ratio of the twin components being 0.37 (5):0.63 (5).

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3,3'-Dimethyl-1,1'-[(1,3-dihy-droxy-propane-2,2-di-yl)dimethyl-idene]diimidazolium bis-(hexa-fluoro-phosphate).

Project description:The title compound, C(13)H(22)N(4)O(2) (2+)·2PF(6) (-), was prepared by the anion exchange of the dibromide ionic liquid with potassium hexa-fluoro-phosphate. The two imidazole rings are each planar (r.m.s. deviations = 0.0016 and 0.0060?Å) and make a dihedral angle of 45.3?(18)°. Intra-molecular O-H?F hydrogen bonds occur. Inter-molecular C-H?F, O-H?O and C-H?O hydrogen bonds stabilize the crystal structure.

| S-EPMC3011425 | biostudies-literature

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