Synthesis and Thermogravimetric Behaviour of Ni(II), Cu(II) and Zn(II) Complexes of Triazine-Salicyldamine Schiff Bases

摘要

Synthesis, characterization and thermogravimetric behaviour of Ni(II), Cu(II) and Zn(II) complexes of Schiff bases derived from 4-phenyl-1,3,5-triazine-2,6-diamine and 5-chloro- salicylaldehyde (H2L1), 5-bromo-salicylaldehyde (H2L2) have been reported. Theligands were characterized by FT-IR, ~1H and ~(13)C NMR, UV-visible spectroscopy as well as elemental analysis. Spectral studies revealed that the ligands were acting as tetradentate chelating agents and coordinated to the metal center via deprotonated phenolate oxygen and azomethine nitrogen atoms in a 1:1 ligand to metal ratio. Thermal behaviour of the complexes has been evaluated using TGA. All complexes showed similar modes of three steps weight loss upon heating to 800 °C with gradual loss of organic and inorganic parts. The residues after heating corresponds to metal oxides, with copper complexes seemed to be the most stable and can be used in high-temperature catalytic cycles.