Abstract
The title compound, C16H16N2O6, lies about an inversion centre at the mid-point of the N—N bond. The molecule features two intramolecular O—H...N and two C—H...O hydrogen bonds, each of which forms an S(6) ring motif. In the crystal, molecules are linked by C—H...O hydrogen bonds into infinite zigzag chains propagating along the c-axis direction. π–π stacking interactions between the pyrone rings [centroid–centroid distances = 3.975 (2) Å] stack the molecules along b.
Highlights
The title compound, C16H16N2O6, lies about an inversion centre at the mid-point of the N—N bond
Molecules are linked by C—HÁ Á ÁO hydrogen bonds into infinite zigzag chains propagating along the c-axis direction. – stacking interactions between the pyrone rings [centroid–centroid distances = 3.975 (2) A ] stack the molecules along b
The asymmetric unit of the title compound contains half of the molecule with the other half generated by inversion symmetry
Summary
Symmetry codes: (i) x; Ày þ 1; z À 12; (ii) x; Ày; z þ 12. 148 152 133 136 product (either a bis-pyrone or a bis-pyridone). Symmetry codes: (i) x; Ày þ 1; z À 12; (ii) x; Ày; z þ 12. 148 152 133 136 product (either a bis-pyrone or a bis-pyridone). In order to establish the structure of this product, single crystals were prepared for X-ray analysis. The asymmetric unit of the title compound contains half of the molecule with the other half generated by inversion symmetry. Molecules are stacked along b by – interactions between the pyridone rings with a centroid–centroid distance of 3.975 (2) A , Fig. 3. C16H16N2O6 332.31 Monoclinic, C2/c 296 27.797 (3), 3.9750 (4), 14.4569 (15) 110.642 (4) 1494.8 (3) 4 Mo K 0.12 0.32 Â 0.25 Â 0.19
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