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Redetermination of pyridine-4-carbonitrile–chloranilic acid (1/1) at 180 K
In the crystal structure of the title compound, C(6)H(4)N(2)·C(6)H(2)Cl(2)O(4), two chloranilic acid (systematic name: 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone) molecules are connected by O—H⋯O hydrogen bonds to form a dimeric unit. The pyridine-4-carbonitrile molecules are linked on both side...
Autores principales: | , , |
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Formato: | Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2008
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2961658/ https://www.ncbi.nlm.nih.gov/pubmed/21202894 http://dx.doi.org/10.1107/S1600536808017182 |
Sumario: | In the crystal structure of the title compound, C(6)H(4)N(2)·C(6)H(2)Cl(2)O(4), two chloranilic acid (systematic name: 2,5-dichloro-3,6-dihydroxy-1,4-benzoquinone) molecules are connected by O—H⋯O hydrogen bonds to form a dimeric unit. The pyridine-4-carbonitrile molecules are linked on both sides of the dimer via N⋯H⋯O hydrogen bonds to give a centrosymmetric 2:2 complex of pyridine-4-carbonitrile and chloranilic acid. The H atom in the N⋯H⋯O hydrogen bond is disordered over two positions with approximately equal occupancies. The pyridine ring makes a dihedral angle of 61.54 (14)° with the chloranilic acid plane. The 2:2 units are further linked by intermolecular C—H⋯O and C—H⋯Cl hydrogen bonds. This determination presents a siginficantly higher precision crystal structure than the previously published structure [Tomura & Yamasshita (2008 ▶). X-ray Struct. Anal. Online, 24, x31–x32]. |
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