title: Crystal structure of (1Z)-1-(4-chloro-benzyl-idene)-5-(4-meth-oxy-phen-yl)-3-oxopyrazolidin-1-ium-2-ide.
abstract: The title mol-ecule, C17H15ClN2O2, is L-shaped with the 4-chloro-benzyl-idene ring almost coplanar with the planar pyrazolidine ring (r.m.s. deviation = 0.020 Å), making a dihedral angle of 4.83 (17)°. The 4-meth-oxy-phenyl ring is almost normal to the mean plane of the pyrazolidine ring and the 4-chloro-benzyl-idene ring, with dihedral angles of 87.36 (17) and 89.23 (16)°, respectively. The pyrazolidine ring occurs in the betaine form with a Z configuration for the exocyclic C=N bond. In the crystal, C-H⋯O and C-H⋯π inter-actions generate ribbons of mol-ecules along [1-10].
authors.affiliation: Chemistry Department, University of Kinshasa, Kinshasa XI BP 212, Democratic Republic of the Congo.
authors.forename: Peter
authors.initials: P
authors.lastname: Mangwala Kimpende
authors.affiliation: Faculty of Chemistry, Hanoi National University of Education, 136 - Xuan Thuy - Cau Giay, Hanoi, Vietnam.
authors.forename: Thi Kieu Oanh
authors.initials: TK
authors.lastname: Doan
authors.affiliation: Faculty of Chemistry, Hanoi National University of Education, 136 - Xuan Thuy - Cau Giay, Hanoi, Vietnam.
authors.forename: Quoc Trung
authors.initials: QT
authors.lastname: Vu
authors.affiliation: Chemistry Department, KU Leuven, Celestijnenlaan 200F, B-3001 Leuven (Heverlee), Belgium.
authors.forename: Luc
authors.initials: L
authors.lastname: Van Meervelt
keywords: betaine structure; crystal structure; pyrazolidinium ylide