title: Crystal structure of (4Z)-4-[(2E)-3-(4-chloro-phen-yl)-1-hy-droxy-prop-2-en-1-yl-idene]-5-methyl-2-phenyl-1H-pyrazol-5(4H)-one.
abstract: In the the asymmetric unit of the title compound, C19H15ClN2O2, there are two symmetry-independent mol-ecules, which adopt similar conformations. The largest difference is observed in the dihedral angles between the phenyl and the pyrazole fragments [17.00 (12) and 23.42 (10)°]. A strong intra-molecular O-H⋯O hydrogen bond with the S (6) motif is observed in both mol-ecules. Pairs of π-π stacking inter-actions between the phenyl groups [centroid-centroid distances = 3.6627 (13) and 3.7156 (14) Å] assemble the mol-ecules into two types of centrosymmetric dimers. Weak C-H⋯O inter-actions connect mol-ecules into chains along the b axis.
authors.affiliation: Department of Chemistry, University of the Punjab, Lahore, Punjab, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Shahid
authors.affiliation: Department of Chemistry, University of the Punjab, Lahore, Punjab, Pakistan.
authors.forename: Munawar Ali
authors.initials: MA
authors.lastname: Munawar
authors.affiliation: Department of Physics, University of Sargodha, Sargodha, Punjab, Pakistan.
authors.forename: Muhammad Nawaz
authors.initials: MN
authors.lastname: Tahir
authors.affiliation: Department of Chemistry, University of the Punjab, Lahore, Punjab, Pakistan.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Salim
authors.affiliation: Department of Chemistry, University of the Punjab, Lahore, Punjab, Pakistan.
authors.forename: Khizar Iqbal
authors.initials: KI
authors.lastname: Malik
keywords: C—H⋯O inter­actions; crystal structure; intra­molecular O—H⋯O hydrogen bond; π–π stacking inter­actions