title: Three 4,7-diaryl-2-ethylsulfanylpyrazolo[1,5-a][1,3,5]triazines.
abstract: The molecular dimensions of 2-ethylsulfanyl-7-(4-methylphenyl)-4-phenylpyrazolo[1,5-a][1,3,5]triazine, C20H18N4S, (I), 7-(4-chlorophenyl)-2-ethylsulfanyl-4-phenylpyrazolo[1,5-a][1,3,5]triazine, C19H15ClN4S, (II), and 4,7-bis(4-chlorophenyl)-2-(ethylsulfanyl)pyrazolo[1,5-a][1,3,5]triazine, C19H14Cl2N4S, (III), show evidence for some aromatic delocalization in the pyrazole rings. The conformations adopted by the ethylsulfanyl substituents are different in all three compounds. There are no hydrogen bonds in any of the crystal structures, but pairs of molecules in (II) and (III) are linked into centrosymmetric dimers by pi-stacking interactions.
authors.affiliation: Departamento de Química, Universidad de Nariño, Cuidad Universitaria Torobajo, AA 1175 Pasto, Colombia.
authors.forename: Henry
authors.initials: H
authors.lastname: Insuasty
authors.forename: Paola
authors.initials: P
authors.lastname: Mier
authors.forename: Gina
authors.initials: G
authors.lastname: Suarez
authors.forename: John N
authors.initials: JN
authors.lastname: Low
authors.forename: Justo
authors.initials: J
authors.lastname: Cobo
authors.forename: Christopher
authors.initials: C
authors.lastname: Glidewell
mesh_terms: D018360:Crystallography, X-Ray; D015394:Molecular Structure; D011720:Pyrazoles / Q000737:chemistry*; D014227:Triazines / Q000737:chemistry*
chemical_list: D011720:Pyrazoles; D014227:Triazines