title: (E)-4-Meth-oxy-N'-[(6-methyl-4-oxo-4H-chromen-3-yl)methyl-idene]benzo-hydrazide monohydrate.
abstract: In the title hydrate, C19H16N2O4·H2O, the 4H-chromen-4-one segment is slightly twisted, with a dihedral angle between the two six-membered rings of 3.30 (5)°. The dihedral angles between the plane of the pyran-one ring and the hydrazide plane and between the planes of the pyran-one ring and the benzene ring of the p-meth-oxy-benzene unit are 26.69 (4) and 2.23 (3)°, respectively. The mol-ecule is connected to the solvent water mol-ecule by an N-H⋯O hydrogen bond. In the crystal, there are π-π stacking inter-actions between centrosymmetrically related pyran-one rings [centroid-centroid distance = 3.5394 (9) Å], as well as bridges formed by the water mol-ecules via O-H⋯O hydrogen bonds.
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Ishikawa
authors.affiliation: School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka 422-8526, Japan.
authors.forename: Kohzoh
authors.initials: K
authors.lastname: Watanabe