organic compounds
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In the title molecule, C12H8N2O2, the nitro group is tilted slightly with respect to the carbazole moiety [angle between the least-squares planes = 4.43 (9)°]. In the crystal, the molecules are connected via pairs of N—HO hydrogen bonds into dimers with -1 symmetry. The dimers in turn are arranged into layers parallel to (10-1).
research communications
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2,5-Diazido-1,4-phenylene diacetate and dibutyrate are the first structurally characterized representatives with a trans-diazidophenylene entity. Both molecules possess inversion symmetry; however, the compounds crystallize in different crystal systems (triclinic versus monoclinic).
research communications
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The central ternary N atoms in the isotypic crystal structures of the substituted anilines show no sign of pyramidalization.
research communications
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Crystal structure of trans-1,4-bis[(trimethylsilyl)oxy]cyclohexa-2,5-diene-1,4-dicarbonitrile
The molecular structure of the title compound is centrosymmetric. The cyclohexa-2,5-diene moiety is exactly planar and has a bond-length distribution characteristic for one pair of double bonds and two pairs of single bonds.
organic compounds
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In the title molecule, C18H12BrN, the 4-bromophenyl ring is inclined to the mean plane of the carbazole moiety (r.m.s. devation = 0.027 Å) by 49.87 (5)°. In the crystal, molecules stack along [001] and are linked by C—Hπ interactions forming a corrugated two-dimensional network lying parallel to (100).
data reports
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In the molecule of the title compound, C18H35N3P2, the methylpyridine-2,6-diamine moiety is almost planar, with a maximum deviation of 0.0129 (9) Å for one of the amine N atoms. Whereas one of the P atoms is co-planar with this mean plane [deviation = 0.0158 (10) Å], the other P atom is considerably displaced out of the mean plane by 0.5882 (10) Å. In the crystal, no directional intermolecular interactions beyond van der Waals contacts could be identified.