<p>In the title compound, C13H10BrN3O2.H2O, the conformation about the azomethine double bond is E. The molecule exists in the amido form with a C=O bond length of 1.229 (2) Å There is an intramolecular O-H N hydrogen bond forming an S(6) ring motif. The whole molecule is almost planar, with an r.m.s. deviation of 0.021 Å for all non-H atoms, and the dihedral angle between the planes of the pyridine and benzene rings is 0.74 (12) ° In the crystal, the water molecule of crystallization links the organic molecules via Ow-H O, Ow-H N and N-H Ow hydrogen bonds and short C-H Ow contacts, forming sheets lying parallel to (100). Within the sheets there is a weak π-π interaction involving the pyridine and benzene rings [centroid-to-centroid distance = 3.8473 (15) Å]. The sheets are linked via C-H Br interactions, forming a three-dimensional network.</p>
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S. Sravya, Sruthy, S., Aiswarya, N., Sithambaresan, M., and Kurup, M. R. Prathapach, “Crystal structure of (E)-N'-(5-bromo-2-hydroxybenzylidene) nicotinohydrazide monohydrate”, Acta Crystallographica Section E: Crystallographic Communications, vol. 71, pp. 734-736, 2015.