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1,2-Bis(2,4,6-trinitro-phen-yl)ethane.

ABSTRACT: The title compound, C(14)H(8)N(6)O(12), is centrosymmetric, the mid-point of the central C-C bond being located on an inversion centre. Two of the three independent nitro groups are disordered over two sites, with a site-occupancy ratio of 0.513?(3):0.487?(3). Weak inter-molecular C-H?O hydrogen bonding is present in the crystal structure.

SUBMITTER: Wang WY

PROVIDER: S-EPMC3247438 | biostudies-literature | 2011 Nov

REPOSITORIES: biostudies-literature

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1,2-Bis(2,4,6-trinitro-phen-yl)ethane.

Wang Wen-Yan WY Diao Ying Y Wei Zhi-Hua ZH Wang Jian-Long JL

Acta crystallographica. Section E, Structure reports online 20111029 Pt 11

The title compound, C(14)H(8)N(6)O(12), is centrosymmetric, the mid-point of the central C-C bond being located on an inversion centre. Two of the three independent nitro groups are disordered over two sites, with a site-occupancy ratio of 0.513 (3):0.487 (3). Weak inter-molecular C-H⋯O hydrogen bonding is present in the crystal structure. ...[more]

PMID: 22220056

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1,2-Bis{bis-[4-(trifluoro-meth-yl)phen-yl]phosphino}ethane.

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Project description:The title compound, C(24)H(26)O(2)Si(2), has C(2) crystallographic symmetry. The dihedral angle between the aromatic rings is 84.5 (2)°. The acetyl-ene group is slightly non-linear, with angles at the acetyl-ene C atoms of 175.7 (2) and 177.0 (2)°. In the crystal structure, only van de Waals interactions occur.

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Project description:The title compound, C(18)H(12)N(6)O(6), was prepared from the reaction of 4-(phenyl-diazen-yl)aniline (aniline yellow) with picryl-sulfonic acid. The dihedral angle formed by the two benzene rings of the diphenyl-diazenyl ring system is 6.55?(13)° and that formed by the rings of the picrate-aniline ring system is 48.76?(12)°. The mol-ecule contains an intra-molecular aniline-nitro N-H?O hydrogen bond.

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Project description:The title compound, C14H6F4O2, crystallizes with half of a mol-ecule per asymmetric unit and exhibits bond lengths and angles typical of α-diketones. A network of C-H⋯F contacts and π-π stacking inter-actions is observed within the structure.

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Crystal structure of 1,2-bis-[(2-tert-butyl-phen-yl)imino]-ethane.

Project description:The whole molecule of the title compound, C22H28N2, (I), is generated by inversion symmetry. The mol-ecule is rather similar to that of 2,3-bis-[(2-tert-butyl-phen-yl)imino]-butane, (II), a di-imine ligand comprising similar structural features [Ferreira et al. (2006 ▶). Acta Cryst. E62, o4282-o4284]. Both ligands crystallize with the -N=C(R)-C(R)=N- group around an inversion centre, in a trans configuration. Comparing the two structures, it may be noted that the independent planar groups in both mol-ecules [the central link, -N=C(R)-C(R)=N-, and the terminal aromatic ring] subtend an angle of 69.6 (1)° in (II) and 49.4 (2)° in (I). Ferreira and co-workers proposed that such angle deviation may be ascribed to the presence of two non-classical intra-molecular hydrogen bonds and steric factors. In fact, in (I), similar non-classical hydrogen bonds are observed, and the larger angular deviation in (II) may be assigned to the presence of methyl groups in the di-imino fragment, which can cause steric hindrance due to the presence of bulky tert-butyl substituents in the aromatic rings. The C=N bond lengths are similar in both compounds and agree with comonly accepted values.

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