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

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...

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Main Authors: KATALIN MÉSZÁROS SZÉCSÉNYI, BERTA HOLLÓ, VUKADIN M. LEOVAC, GORAN A. BOGDANOVIĆ, ŽELJKO K. JAĆIMOVIĆ
Formato: Artigo
Idioma:Inglês
Publicado: Serbian Chemical Society 2009-11-01
Series:Journal of the Serbian Chemical Society
Assuntos:
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 ammonium 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 geometry
which in the case of zinc complex is formed by monodentate coordination of two aamp molecules and two isothiocyanate groups. The Zn(II) and Hg(II) atoms have significantly deformed coordination geometry. In both crystal 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.
Acceso en liña:http://www.shd.org.rs/JSCS/Vol74/No11/08-4444_3916.pdf
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