{[Eth­yl(pyridin-4-ylmeth­yl)carbamo­thio­yl]sulfanido-κ²S,S′}(1,4,7,10,13,16-hexa­oxa­cyclo­octa­decane-κ⁶O)potassium

The asymmetric unit of title salt co-crystal, [K(C₉H₁₁N₂S₂)(C₁₂H₂₄O₆)], comprises a K⁺ cation, an ⁻S₂CN(Et)py anion and a 18-crown-6 mol­ecule. Substantial delocalization of π-electron density is evident in the di­thio­carbamate anion, as indicated by the equivalent C—S bond lengths. The K⁺ cation sits within an O₆S₂ donor set lying 0.7506 (6) Å out of the least-squares plane through the six O atoms (r.m.s. deviation = 0.1766 Å) of the 18-crown-6 mol­ecule with the two S atoms being on one side of this plane. Supra­molecular layers in the bc plane, sustained by C—H...O and C—H...π inter­actions, feature in the crystal packing.

The co-crystal N,N′-bis­[(pyridin-1-ium-2-yl)meth­yl]ethane­dithio­amide bis­(2,6-di­nitro­benzoate)–2,6-di­nitro­benzoic acid (1/4)

The asymmetric unit of title co-crystal, C₁₄H₁₆N₄S₂²⁺·2C₇H₃N₂O₆⁻·4C₇H₄N₂O₆, comprises a centrosymmetric dipyridinium dication, a 2,6-di­nitro­benzoate anion and two independent 2,6-di­nitro­benzoic acid mol­ecules. The pyridin­ium rings are each approximately perpendicular to the central di­thio­amide unit [dihedral angle = 80.67 (12)°]. The carboxyl­ate/carb­oxy­lic acid groups are approximately perpendicular to the benzene ring to which they are attached [dihedral angles = 78.85 (16), 81.46 (19) and 71.28 (15)°]. By contrast, the major twist exhibited by a nitro group is manifested in a dihedral angle of 32.66 (17)°. The most prominent feature of the crystal packing is linear supra­molecular chains along [1-10], featuring O—H...O(carboxyl­ate) and pyridinium-N—H...O hydrogen bonds. These are consolidated into a three-dimensional architecture by thio­amide–nitro N—H...O, C—H...O and π–π [inter-centroid distance = 3.524 (2) Å] inter­actions. One of the nitro O atoms was refined over two sites; the major site was 0.65 (7) occupied.