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2-Chloro-5-methyl-3-nitro-pyridine.

ABSTRACT: The title compound, C(6)H(5)ClN(2)O(2), crystallizes with two independent mol-ecules in the asymmetric unit. Inter-molecular C-H?O hydrogen bonds stabilize the crystal structure.

SUBMITTER: Zhang DT

PROVIDER: S-EPMC3247518 | biostudies-literature | 2011 Nov

REPOSITORIES: biostudies-literature

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2-Chloro-5-methyl-3-nitro-pyridine.

Zhang Da-Tong DT Huo Ling-Yan LY

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

The title compound, C(6)H(5)ClN(2)O(2), crystallizes with two independent mol-ecules in the asymmetric unit. Inter-molecular C-H⋯O hydrogen bonds stabilize the crystal structure. ...[more]

PMID: 22220136

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2-Chloro-3-nitro-pyridine.

Project description:In the title compound, C(5)H(3)ClN(2)O(2), the nitro group is twisted by 38.5?(2)° with respect to the pyridine ring. In the crystal, adjacent mol-ecules are linked by non-classical C-H?N and C-H?O hydrogen bonds, forming a layer motif.

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2-Chloro-5-nitro-pyridine.

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Project description:In the title compound, C(7)H(6)ClNO(3)S, the nitro group forms a dihedral angle of 2.7?(4)° with the benzene ring. The bond-angle sum at the S atom is 303.7°. In the crystal, mol-ecules are linked by weak C-H?O hydrogen bonds, forming layers lying parallel to (-101).

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1-Chloro-2-methyl-3-nitro-benzene.

Project description:In the title compound, C(7)H(6)ClNO(2), the chloro, methyl and nitro substituents are situated next to each other in this order on the benzene ring, with the mean plane of the nitro group twisted away from the mean plane of the benzene ring by 38.81 (5)°.

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2-(4-Methyl-phen-oxy)-5-nitro-pyridine.

Project description:The title mol-ecule, C(12)H(10)N(2)O(3), is twisted, the dihedral angle between the rings being 61.16?(13)°. The nitro group is approximately coplanar with the pyridine ring to which it is attached [O-N-C-C torsion angle = -178.1?(3)°]. Supra-molecular chains along [010] and mediated by C-H?O and ?-? [centroid(pyrid-yl)-(benzene) distance = 3.8259?(18)?Å] contacts feature in the crystal packing.

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Redetermination of 2-methyl-4-nitro-pyridine N-oxide.

Project description:An improved crystal structure of the title compound, C6H6N2O3, is reported. The structure, previously solved [Li et al. (1987 ▶). Jiegou Huaxue (Chin. J. Struct. Chem.), 6, 20-24] in the ortho-rhom-bic space group Pca21 and refined to R = 0.067, has been solved in the ortho-rhom-bic space group Pbcm with data of enhanced quality, giving an improved structure (R = 0.0485). The mol-ecule adopts a planar conformation with all atoms lying on a mirror plane. The crystal structure is composed of mol-ecular sheets extending parallel to the ab plane and connected via C-H⋯O contacts involving ring H atoms and O atoms of the N-oxide and nitro groups, while van der Waals forces consolidate the stacking of the layers.

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Investigation of nitro-nitrito photoisomerization: crystal structures of trans-{2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato}(pyridine/4-methyl-pyridine)-nitro-cobalt(III).

Project description:The reaction cavities of the nitro groups in the title compounds, trans-{2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato-?4 O,N,N',O'}(nitro-?N)(pyridine-?N)cobalt(III), [Co(C16H14N2O2)(NO2)(C5H5N)], (I), and trans-{2,2'-[ethane-1,2-diylbis(nitrilo-methyl-idyne)]diphenolato-?4 O,N,N',O'}(4-methyl-pyridine-?N)(nitro-?N)cobalt(III), [Co(C16H14N2O2)(NO2)(C6H7N)], (II), have been investigated to reveal that the inter-molecular CMe-H?O(nitro) contacts in (II) are unfeasible for the nitro-nitrito photochemical linkage isomerization process. In (I), there are two independent complexes showing similar conformations, and the central five-membered chelate ring of the tetra-dentate salen ligand adopts the same absolute configuration. This is the result of pseudo-spontaneous resolution, since the configuration of the five-membered chelate ring may frequently be reversed in solution. In the crystals of (I) and (II), the mol-ecules are linked into three-dimensional networks by C-H?O hydrogen bonds.

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