Journal of the Brazilian Chemical Society
On-line version ISSN 1678-4790
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 1678-4790. 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.