Syntheses and Characterization of Coordination Compounds of 3d-Metal 5-Sulfosalicylates with Phenylacethydrazide: Crystal Structure of [Ni(L)3]HSSal · 3H2O (L is Phenylacethydrazide, and HSSal^2– is 5-Sulfosalicylic Acid Anion)

The complexes of 3d-metal 5-sulfosalicylates with phenylacethydrazide are synthesized: [Co(L)3]HSSal · 3H2O (I), [Ni(L)3]HSSal · 3H2O (II), and [Zn(L)3]HSSal · 6H2O (III) (L is phenylacethydrazide, and HSSal2– is 5-sulfosalicylic acid anion). Compounds I–III are characterized by the methods of chemical analysis, IR spectroscopy, diffuse reflectance spectroscopy, luminescence, and thermogravimetry. Compound II is studied by X-ray diffraction analysis (СIF file CCDC no. 1819696). In the complex cation [Ni(L)3]2+, the nickel atom has a face octahedral coordination mode by three O atoms and three N atoms of three bidentate chelate ligands L. The complex cations, HSSal2– anions, and crystallization water molecules are joined by a branched system of hydrogen bonds. Complexes I–III are luminescent, and complex III exhibits the brightest luminescence.