Oxalic acid–pyridine-4-carbonitrile (1/2)
نویسنده
چکیده
In the title compound, 2C(6)H(4)N(2)·C(2)H(2)O(4), the oxalic acid mol-ecule lies about an inversion center. The pyridine ring of the pyridine-4-carbonitrile mol-ecule is almost planar, the largest deviation from the least-squares plane being 0.006 (1) Å; the nitrile N atom deviates from this plane by 0.114 (1) Å. In the crystal, the oxalic acid mol-ecules and the pyridine-4-carbonitrile mol-ecules form stacks. Neighboring mol-ecules within the stacks are related by translation in the a direction, with inter-planar distances of 3.183 (1) and 3.331 (2) Å, respectively. Each oxalic acid mol-ecule forms strong O-H⋯N hydrogen bonds with two mol-ecules of pyridine-4-carbonitrile. Besides this, there are also weak C-H⋯O inter-actions.
منابع مشابه
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-dihydr-oxy-1,4-benzoquinone) mol-ecules are connected by O-H⋯O hydrogen bonds to form a dimeric unit. The pyridine-4-carbonitrile mol-ecules are linked on both sides of the dimer via N⋯H⋯O hydrogen bonds to give a centrosymmetric 2:2 complex of pyridine-4-carbo...
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