Abstract

MA, Guixia; ZHANG, Tonglai  and  YU, Kaibei. Synthesis, X-ray crystal structure and thermal decomposition mechanism of [Zn(MCZ)₃](NO₃)₂·H₂O (MCZ=Methyl Carbazate). J. Braz. Chem. Soc. [online]. 2005, vol.16, n.4, pp. 796-800. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532005000500018.

A new coordination complex, [Zn(MCZ)₃](NO₃)₂·H₂O, was synthesized by the reaction of the aqueous solutions of zinc(II) nitrate and methyl carbazate. The complex was characterized by IR spectroscopy, elemental analysis and X-ray diffraction. It crystallizes in the monoclinic space group P2₁/n. The central metal ion has distorted octahedral six-coordination environment, and is coordinated to bidentate MCZ ligands through carbonyl oxygen atoms and the terminal nitrogen atoms. [Zn(MCZ)₃]²⁺ cations, NO₃^- anions and lattice water molecules are interconnected by electrostatic forces and hydrogen bonds into a 3-D network. The thermal decomposition mechanism was suggested by DSC and TG-DTG studies under the linear heating rates. [Zn(MCZ)₃](NO₃)₂·H₂O begins to decompose at 181.9 °C, and the final solid residue at 300 °C is ZnO.

Keywords : zinc(II) complex; methyl carbazate; crystal structure; thermal decomposition.