Divalent complexes of 3-hydroxy-4-methyl-2(3H)-thiazolethione with Co–Zn: synthesis, X-ray crystal structures and the structure-directing influence of C–H⋯S interactions

Divalent complexes of the cyclic thiohydroxamic acid 3-hydroxy-4-methyl-2(3H)-thiazolethione with first-row d-block elements Co–Zn have been synthesised and the crystal structures of the Zn and Ni complexes have been determined by single-crystal X-ray diffraction. Single crystals suitable for X-ray analysis could not be obtained for the Cu or Co complexes, but their structures have been elucidated from laboratory powder X-ray diffraction data using a molecular-modelling approach. Directional intermolecular interactions in the complexes are weak in nature, comprising C–H⋯O and C–H⋯π contacts. Close C–H⋯S contacts also exist, but a general CSD survey shows that these interactions do not display any structure-directing properties which might facilitate their use in crystal engineering strategies.

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