Preparation, characterization, and kinetics of thermolysis of nickel and copper nitrate complexes with 2,2′-bipyridine ligand

Nickel and copper nitrate complexes with 2,2′-bipyridine (bipy) as a N donor and nitrate and water as oxygen donor ligands of the general formula [M(NO3)(C10H8N2)(H2O)3](NO3), where M = Ni and Cu, have been obtained from the corresponding metal nitrate salts. These complexes were characterized by X-ray crystallography, FT-IR, and CHN analysis. Both the complexes have been found to be six coordinated. Their thermal decomposition behaviour was investigated by TG, DTA, and ignition delay measurements. TG–DTA examinations of these complexes revealed multistep thermal decomposition. The corresponding metal oxide residues obtained after thermolysis were identified from their X-ray diffraction patterns (XRD). Kinetics of isothermal decomposition of the complexes was established from both the model-fitting as well as isoconversional methods.

Nickel and copper nitrate complexes with 2,2′-bipyridine, nitrate and water ligands have been prepared and characterized by single crystal X-ray diffraction, FT-IR and CHN analyses. Thermolysis was performed by using TG, DTA and ignition delay measurements. The kinetics of thermolysis were also evaluated.Figure optionsDownload as PowerPoint slideHighlights
► Preparation and characterization of Ni and Cu nitrate complexes have been reported.
► Thermolysis has been carried out using TG–DTA and ignition delay measurements.
► Their thermal decomposition pathways have been proposed.
► Oxides residues as end product of thermolysis were revealed by XRD patterns.
► Kinetics of their isothermal decomposition was evaluated.