title: Crystal structure of (E)-4-hy-droxy-6-methyl-3-{1-[2-(4-nitro-phen-yl)hydrazinyl-idene]eth-yl}-2H-pyran-2-one.
abstract: The title compound, C14H13N3O5(HMNP), was synthesized by the simple condensation ofp-nitro-phenyl-hydrazine with de-hydro-acetic acid (DHA) in a 1:1 molar ratio in ethanol. HMNP has been characterized by using FT-IR,1H and13C NMR and UV-Vis spectroscopic and single-crystal X-ray diffraction techniques. The crystal packing reveals strong hydrogen bonds between the NH group and the carbonyl O atom of di-hydro-pyran-one moiety, forming chains along [101]. The thermal stability of the synthesized compound was confirmed by thermogravimetric analysis and it was found to be stable up to 513 K. The UV-Vis spectrum shows the presence of a strong band at λmax394 nm.1H NMR and single-crystal X-ray analyses confirmed the presence of theenolform of the ligand and dominance over theketoform. The crystal studied was a non-merohedral twin with the refined ratio of the twin components being 0.3720 (19):0.6280 (19).
authors.affiliation: Department of Chemistry, Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India.
authors.lastname: Kirandeep
authors.affiliation: Department of Chemistry, DAV University Jalandhar, Jalandhar 144 001, Punjab, India.
authors.forename: Ahmad
authors.identifier: https://orcid.org/0000-0002-3621-3433
authors.initials: A
authors.lastname: Husain
authors.affiliation: Department of Chemistry, Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India.
authors.forename: Pooja
authors.initials: P
authors.lastname: Negi
authors.affiliation: Department of Chemistry, Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India.
authors.forename: Girijesh
authors.initials: G
authors.lastname: Kumar
authors.affiliation: Department of Chemistry, Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India.
authors.forename: Ramesh
authors.identifier: https://orcid.org/0000-0002-4279-4801
authors.initials: R
authors.lastname: Kataria
keywords: HMNP; crystal structure; de­hydro­acetic acid; hydrogen bonding; thermal stability