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The title compound, [Na(C10H9.5N2O2S2)2(H2O)], is a mol­ecular sodium complex with N′-(1,3-dithio­lan-2-yl)-2-hy­droxy­benzohydrazide ligands with the negative charge spread evenly over both, and a water mol­ecule. The NaI ion coordination is distorted trigonal–bipyramidal, formed by two N and three O atoms, with the NaI ion lying on a twofold rotation axis. Intra­molecular N—H...O hydrogen bonds occur. Mol­ecules pack as discrete units and the crystal packing is stabilized by strong O—H...O hydrogen bonds, which give rise to chains along [010]; the chains are inter­linked by strong O—H...O hydrogen bonds.

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In the title complex, [Cu(C9H7N2O2S)2], the CuII ion, located on an inversion center, adopts an N2O2 square-planar coord­ination. The 2-(5-methyl­sulfanyl-1,3,4-oxadiazol-2-yl)phenolate ligand is chelated to the central CuII ion in an N,O-bidentate manner.

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The title compound, C12H16N2O2, crystallized from toluene with two independent mol­ecules in the asymmetric unit. The dihedral angles between the amide groups and the benzene ring are 60.87 (11) and 54.08 (11)° in one independent molecule and 60.13 (11) and 64.64 (11) in the other. The crystal structure features weak C—H...O hydrogen bonds and C—H...π inter­actions.
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