title: Two N-substituted 3,5-diphenyl-2-pyrazoline-1-thiocarboxamides.
abstract: The structures of N-ethyl-3-(4-fluorophenyl)-5-(4-methoxyphenyl)-2-pyrazoline-1-thiocarboxamide, C19H20FN3OS, (I), and 3-(4-fluorophenyl)-N-methyl-5-(4-methylphenyl)-2-pyrazoline-1-thiocarboxamide, C18H18FN3S, (II), have similar geometric parameters. The methoxy/methyl-substituted phenyl groups are almost perpendicular to the pyrazoline (pyraz) ring [interplanar angles of 89.29 (8) and 80.39 (10) degrees for (I) and (II), respectively], which is coplanar with the fluorophenyl ring [interplanar angles of 5.72 (9) and 10.48 (10) degrees]. The pyrazoline ring approximates an envelope conformation in both structures, with the two-coordinate N atom involved in an intramolecular N-H...N(pyraz) interaction. In (I), N-H...O and C-H...S intermolecular hydrogen bonds are the primary interactions, whereas in (II), there are no intermolecular hydrogen bonds.
authors.affiliation: Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayis University, Kurupelit, 55139 Samsun, Turkey. yavuzk@omu.edu.tr
authors.forename: Yavuz
authors.initials: Y
authors.lastname: Köysal
authors.forename: Samil
authors.initials: S
authors.lastname: Işik
authors.forename: Gülay
authors.initials: G
authors.lastname: Sahin
authors.forename: Erhan
authors.initials: E
authors.lastname: Palaska
mesh_terms: D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D015394:Molecular Structure; D011720:Pyrazoles / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D011720:Pyrazoles