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The title compound, C14H19N3OS, is in the thioketo form, with the thione S and hydrazine N atoms cis with respect to each other so that the S atom is involved in inter- and intramolecular hydrogen bonds simultaneously. Intermolecular C-H...S and C-H...O hydrogen bonds result in one-dimensional polymeric chains of molecules along the a axis. A weak C-H...pi ring interaction binds the polymeric chains together.

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A novel binuclear Ni(II) complex of salicylaldehyde 3-azacyclothiosemicarbazone (H 2 L) has been synthesized and characterized by elemental analysis, IR and UV-Vis spectroscopy. The single crystal X-ray structure of the complex shows that bridging occurs through thiolato sulfur and phenolic oxygen atoms. Nickel centers in the complex have square planar and octahedral geometries.