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The work is concerned with the crystal and molecular structures of zinc(II) and mercury(II) complexes with 4-acetyl-3-amino-5-methyl- -pyrazole (aamp) of the coordination formulae (Zn(NCS)2(aamp)2) and (Haamp)2(Hg(SCN)4). The zinc(II) complex was obtained by the reaction of a warm methanolic solution of aamp with a mixture of zinc(II) nitrate and am- monium thiocyanate, whereas the mercury(II) complex was prepared by the reaction of a warm ethanolic solution of aamp and a warm, slightly acidified aqueous solution of (Hg(SCN)4) 2- . Both complexes have a tetrahedral geo- metry, which in the case of zinc complex is formed by monodentate coordi- nation of two aamp molecules and two isothiocyanate groups. The Zn(II) and Hg(II) atoms have significantly deformed coordination geometry. In both crys- tal structures the pyrazole derivative has a planar form, probably stabilized by an intramolecular N-H⋅⋅⋅O hydrogen bond. Apart from the X-ray structural analysis, the isolated complexes were characterized by elemental analysis, IR spectroscopy, conductometric measurements and thermal analysis.

journal of the serbian chemical society

Transition metal complexes with pyrazole-based ligands, Part 29: Reactions of zinc(II) and mercury(II) thiocyanate with 4-acetyl-3-amino-5-methylpyrazole