title: Crystal structure of (E)-3-(3,4-di-meth-oxy-phen-yl)-1-(1-hy-droxy-naphthalen-2-yl)prop-2-en-1-one.
abstract: The mol-ecular structure of the title compound, C21H18O4, consists of a 3,4-di-meth-oxy-phenyl ring and a naphthalene ring system linked via a prop-2-en-1-one spacer. The mol-ecule is almost planar, with a dihedral angle between the benzene ring and the naphthalene ring system of 2.68 (12)°. There is an intra-molecular O-H⋯O hydrogen bond involving the adjacent hy-droxy and carbonyl groups. The mol-ecule has an E conformation about the C=C bond and the carbonyl group is syn with respect to the C=C bond. In the crystal, mol-ecules are linked by bifurcated C-H⋯(O,O) hydrogen bonds, enclosing an R 2 (1)(6) ring motif, and by a further C-H⋯O hydrogen bond, forming undulating sheets extending in b- and c-axis directions. There are π-π inter-actions between the sheets, involving inversion-related naphthalene and benzene rings [inter-centroid distance = 3.7452 (17) Å], forming a three-dimensional structure.
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: K S
authors.initials: KS
authors.lastname: Ezhilarasi
authors.affiliation: PG and Research Department of Chemistry, Presidency College, Chennai-5, Tamil Nadu, India.
authors.forename: D
authors.initials: D
authors.lastname: Reuben Jonathan
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: R
authors.initials: R
authors.lastname: Vasanthi
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: B K
authors.initials: BK
authors.lastname: Revathi
authors.affiliation: PG and Research Department of Physics, Queen Mary's College, Chennai-4, Tamilnadu, India.
authors.forename: G
authors.initials: G
authors.lastname: Usha
keywords: 1,3-diphenyl-2-propene-1-ones; O—H⋯O intra­molecular hydrogen bond; bifurcated C—H⋯O hydrogen bonds; chalcones; crystal structure; α,β-unsaturated carbonyl system