Synthesis, characterization and thermolysis of lanthanide metal nitrate complexes with 1, 10-phenanthroline, Part-95

The nitrate complexes of cerium, praseodymium and neodymium with 1,10-phenanthroline (phen) of general formula [Ln(phen)2(NO3)2(H2O)2]·NO3 (where, Ln=Ce, Pr and Nd) were prepared and characterized by X-ray crystallography. Thermolysis of these complexes was investigated by simultaneous thermogravimetry (TG) and differential thermal analysis (DTA). Isothermal TG was taken to evaluate the kinetic parameters using model fitting as well as model free isoconversional methods. The thermolytic pathways were also suggested, which involves decomposition followed by ignition. All the three complexes had coordination number ten and showed multistep decompositions. In order to evaluate the response of rapid heating, ignition delay (Di) measurements were undertaken. The activation energies for ignition were found to decrease in the order: Nd>Pr>Ce.

Neodymium nitrate with phenanthrolineFigure optionsDownload as PowerPoint slide