Abstract
The title compound, 3C10H8N4·2C7H6O5·2CH4O, has a molecular crystal structure which results from the cocrystallization of gallic acid (GA), 4,4′-azodipyridine (AzPy) and methanol in a 2:3:2 molar ratio. The asymmetric unit comprises one molecule each of GA, AzPy and methanol in general positions and half a molecule of AzPy as this is located about a centre of inversion. In the crystal, all the components of the structure are associated via the extended system of hydrogen bonds (O—H⋯O and O—H⋯N) and π–π stacking interactions [centroid–centroid distance = 3.637 (3) Å] into two-dimensional supramolecular layers which are packed parallel to the [101] plane. The shortest perpendicular distance and the slippage between aromatic groups are 3.395 (3) and 2.152 (3) Å, respectively. The AzPy molecules display a trans conformation with respect to the azo groups.
Highlights
The title compound, 3C10H8N42C7H6O52CH4O, has a molecular crystal structure which results from the cocrystallization of gallic acid (GA), 4,40 -azodipyridine (AzPy) and methanol in a 2:3:2 molar ratio
The asymmetric unit comprises one molecule each of GA, AzPy and methanol in general positions and half a molecule of AzPy as this is located about a centre of inversion
All the components of the structure are associated via the extended system of hydrogen bonds (O—H O and O—H N) and – stacking interactions
Summary
Elena Rusu,a Sergiu Shovab* and Gheorghe Rusuc a Institute of Macromolecular Chemistry ‘Petru Poni’, Polymer Chemistry and Physics. Department, 41A Grigore Ghica Voda Alley, Iasi-700487, Romania, bInstitute of Applied Physics of the Academy of Science of Moldova, 5 Academiei Street, Chisinau. MD-2028, Moldova, and cInstitute of Macromolecular Chemistry ‘Petru Poni’, Inorganic Polymers Department, 41A Grigore Ghica Voda Alley, Iasi-700487, Romania. Key indicators: single-crystal X-ray study; T = 200 K; mean (C–C) = 0.003 Å; disorder in main residue; R factor = 0.055; wR factor = 0.124; data-to-parameter ratio = 13.1
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