title: Crystal structure of 8-eth-oxy-3-(4-nitro-phen-yl)-2H-chromen-2-one.
abstract: In the title compound, C17H13NO5, the coumarin ring system is essentially planar (r.m.s. deviation = 0.008 Å). The nitro-phenyl ring makes a dihedral angle of 25.27 (9)° with the coumarin ring plane. The nitro group is almost coplanar with the phenyl ring to which it is attached, making a dihedral angle of 4.3 (3)°. The eth-oxy group is inclined to the coumarin ring plane by 4.1 (2)°. Electron delocalization was found at the short bridging C-C bond with a bond length of 1.354 (2) Å. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds, forming sheets in the bc plane. The sheets are linked via π-π stacking [centroid-centroid distances = 3.5688 (13) and 3.7514 (13) Å], forming a three-dimensional structure.
authors.affiliation: Department of Chemistry, Kuvempu University, P. G. Centre, Kadur 577 548, India.
authors.forename: Shashikanth
authors.initials: S
authors.lastname: Walki
authors.affiliation: Institution of Excellence, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: S
authors.initials: S
authors.lastname: Naveen
authors.affiliation: Department of Chemistry, Kuvempu University, P. G. Centre, Kadur 577 548, India.
authors.forename: S
authors.initials: S
authors.lastname: Kenchanna
authors.affiliation: Department of Chemistry, Kuvempu University, P. G. Centre, Kadur 577 548, India.
authors.forename: K M
authors.initials: KM
authors.lastname: Mahadevan
authors.affiliation: Department of Chemistry, Yuvaraja's College, University of Mysore, Mysore 570 005, India.
authors.forename: M N
authors.initials: MN
authors.lastname: Kumara
authors.affiliation: Department of Studies in Physics, University of Mysore, Manasagangotri, Mysore 570 006, India.
authors.forename: N K
authors.initials: NK
authors.lastname: Lokanath
keywords: C—H⋯O hydrogen bonds; chromen; coumarin; crystal structure; π–π stacking