The mol­ecules of the title compound, C14H14N2O3S are, linked by an N—H⋯Osulfon­yl hydrogen bond into a chain.

Two mol­ecules of the title compound, C14H13ClN2O3S, are linked by two N—H⋯Osulfon­yl hydrogen bonds about a center of inversion to furnish a hydrogen‐bonded dimer.

The two symmetry‐independent mol­ecules of the title compound, C13H11ClN2O3S, are linked by N—H⋯Os (s = sulfon­yl) and N—H⋯Oh (h = hydr­oxy) hydrogen bonds to furnish a chain that propagates along the a axis of the monoclinic unit cell.

The mol­ecule of the title compound, C14H10FN3O3S, consists of an indole unit and a phenylsulfonyl unit that are disposed in an approximately trans orientation relative to the N—N single bond. Two mol­ecules are arranged about a center of inversion, forming a hydrazide–carbonyl N—H⋯O hydrogen-bonded dimer; the dimers are linked by an indole–sulfonyl N—H⋯O hydrogen bond into a ribbon.

Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.003 Å; R factor = 0.043; wR factor = 0.132; data-to-parameter ratio = 16.1.The two independent molecules in the asymmetric unit of the title compound, C 15 H 16 N 2 O 3 S, are each linked by an N-HÁ Á ÁO sulfonyl hydrogen bond into a linear chain that runs along the shortest axis of the triclinic unit cell. The hydroxy groups are engaged in intramolecular hydrogen bonding and the amino N atom shows pyramidal coordination. Related literature