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The title compound, C7H7NO3S, is a simple new pyridylthio‐N‐oxide of pharmacological inter­est. There are two independent mol­ecules in the asymmetric unit. Strong O—H⋯O hydrogen‐bond inter­actions link the mol­ecules in ribbons lying in the (101) plane.

Key indicatorsSingle-crystal X-ray study T = 100 K Mean (C-C) = 0.003 Å R factor = 0.036 wR factor = 0.094 Data-to-parameter ratio = 17.3For details of how these key indicators were automatically derived from the article, see

Reaction of the hydroxyamine 7-chloro-4-(hydroxyamino)quinoline with the triosmium cluster Os 3 -(CO) 10 (NCMe) 2 gave the complex (µ-H)Os 3 (CO) 10 (µ 2 -η 1 -O-C 9 H 6 N 2 Cl) (3), in which a new mode of µ 2 -η 1 -Ooximato ligand bridged two osmium centers by an oxygen atom. This complex was slowly converted to (µ-H)Os 3 -(CO) 10 (µ 2 -η 2 -ON-C 9 H 6 NCl) (4), where an aromatic C-H moiety in the µ 2 -η 2 -ON-oximatoquinoline group formed an unusual short intramolecular C-H‚‚‚O-N hydrogen bond and an intermolecular C-H‚‚‚OdC hydrogen bond simultaneously. The formation of the intramolecular hydrogen bond may provide a stabilization effect for the generation of the η 2 -ON complex 4 and a driving force for the transformation of 3 to 4.