Isolated molecules in 2-ethylsulfanyl-7-methyl-4-(4-methylphenyl) pyrazolo[1,5-a][1,3,5]triazine and hydrogen-bonded sheets of R22(10), R22(16), R44(22) and R44(24) rings in 2-ethylsulfanyl-7-methyl-4-(4- nitrophenyl)pyrazolo[1,5-a][1,3,5]triazine

Abstract

In each of 2-ethylsulfanyl-7-methyl-4-(4-methylphenyl)pyrazolo[1,5-a][1,3, 5]triazine, C15H16N4S, (I), and 2-ethylsulfanyl-7-methyl-4-(4-nitrophenyl)pyrazolo[1,5-a][1,3,5]triazine, C 14H13N5O2S, (II), there is significant bond fixation in the heterocyclic component. While there are no direction-specific intermolecular interactions in the structure of (I), the molecules of (II) are linked by a combination of C - H⋯O and C - H⋯S hydrogen bonds into sheets containing four types of ring, all centrosymmetric. © 2006 International Union of Crystallography.