Abstract
In the title pyridine N-oxide derivative, C6H4N2O, the 4-cyano substituent almost lies in the mean plane of the pyridine ring (r.m.s deviation of all non-H atoms = 0.004 Å). This redetermination results in a crystal structure with significantly higher precision [N—O bond length is 1.2997 (15) compared with 1.303 (5) Å in the original] than the original determination, which was recorded using the multiple-film technique and visually estimated intensities [Hardcastle et al. (1974 ▶). J. Cryst. Mol. Struct. 4, 305–311]. The crystal structure features weak C—H⋯O and C—H⋯N interactions, which lead to the formation of chains that intersect each other parallel to (001).
Highlights
In the title pyridine N-oxide derivative, C6H4N2O, the 4-cyano substituent almost lies in the mean plane of the pyridine ring (r.m.s deviation of all non-H atoms = 0.004 A )
This redetermination results in a crystal structure with significantly higher precision [N—O bond length is 1.2997 (15) compared with 1.303 (5) Ain the original] than the original determination, which was recorded using the multiple-film technique and visually estimated intensities [Hardcastle et al (1974)
The crystal structure features weak C—HÁ Á ÁO and C—HÁ Á ÁN interactions, which lead to the formation of chains that intersect each other parallel to (001)
Summary
Symmetry codes: (i) Àx þ 1; y À 12; Àz þ 32; (ii) Àx þ 1; Ày þ 1; Àz þ 2; (iii) Àx þ 2; Ày À 1; Àz þ 2. In the title pyridine N-oxide derivative, C6H4N2O, the 4-cyano substituent almost lies in the mean plane of the pyridine ring (r.m.s deviation of all non-H atoms = 0.004 A ). This redetermination results in a crystal structure with significantly higher precision [N—O bond length is 1.2997 (15) compared with 1.303 (5) Ain the original] than the original determination, which was recorded using the multiple-film technique and visually estimated intensities [Hardcastle et al (1974). The crystal structure features weak C—HÁ Á ÁO and C—HÁ Á ÁN interactions, which lead to the formation of chains that intersect each other parallel to (001)
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