Crystal structure of (Z)-4-[1-(4-acetylanilino)ethyl-idene]-3-methyl-1-phenyl-1 H-pyrazol-5(4H)-one

Refaat M. Mahfouz, Zeynep Demircioglu*, Mohamed S. Abbady, Orhan Büyükgüngör, W. T A Harrison (Editor)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
6 Downloads (Pure)


In the solid state, the title compound, C20H19N3O2, adopts the keto-amine tautomeric form, with the H atom attached to the N atom, which participates in an intramolecular N - H⋯O hydrogen bond with an S(6) ring motif. The dihedral angles between the pyrazole ring and the phenyl and benzene rings are 3.69 (10) and 46.47 (9)°, respectively. In the crystal, molecules are linked by weak C - H⋯O hydrogen bonds, generating C(16) chains propagating in [301]. Weak aromatic π-π stacking interactions [centroid-centroid distances = 3.6123 (10) and 3.6665 (10) Å] link the chains into a three-dimensional network.

Original languageEnglish
Pages (from-to)94-96
Number of pages3
JournalActa Crystallographica Section E: Structure Reports Online
Issue number1
Publication statusPublished - 1 Jan 2015

Bibliographical note

The authors acknowledge the Faculty of Arts and Sciences, Ondokuz Mayıs University, Turkey, for the use of the Stoe IPDS 2 diffractometer (purchased under grant F.279 of the University Research Fund).


  • Crystal structure
  • Hydrogen bonding
  • Keto-amine tautomeric form
  • Pyrazolone derivatives
  • Schiff bases
  • π-πstacking interactions


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