ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS, vol.77, pp.759-769, 2021 (ESCI)
In the crystal, the whole molecule of the title compound, C14H12N4O7 center dot 0.224H(2)O, is nearly planar with a maximum deviation from the least-squares plane of 0.352 (1) angstrom. The molecular conformation is stabilized by an intramolecular N-H center dot center dot center dot O hydrogen bond, generating an S(6) ring motif. In the crystal, molecules are linked by centrosymmetric pairs of N-H center dot center dot center dot O hydrogen bonds, forming ribbons along the c-axis direction. These ribbons connected by van der Waals contacts, forming sheets parallel to the ac plane. There are also intermolecular van der Waals contacts and and C-H center dot center dot center dot pi interactions between the sheets. A Hirshfeld surface analysis indicates that the most prevalent interactions are O center dot center dot center dot H/H center dot center dot center dot O (41.2%), H center dot center dot center dot H (19.2%), C center dot center dot center dot H/H center dot center dot center dot C (12.2%) and C center dot center dot center dot O/O center dot center dot center dot C (8.4%).