Thermolysis of some transition metal nitrate complexes with 1,4-diamino butane ligand

Four complexes are prepared and characterized having molecular formula [Zn(dab)2](NO3)2, [Cu(dab)2](NO3)2·H2O, [Ni(dab)2](NO3)2·2H2O and [Mn(dab)2](NO3)2, where dab: 1,4-diaminobutane. Thermolyses of these complexes were investigated by simultaneous thermogravimetry (TG), derivatives thermogravimetry (DTG), differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The kinetics of the thermolysis at early stages is investigated using isothermal TG by applying model-fitting and isoconversional method. Thermolytic process is slow in inert (N2) and is fast in air atmosphere due to oxidative nature. To investigate the response of these complexes under the condition of rapid heating, ignition delay (Di) has been measured. Thermal stability of the complexes was found to increase in the order Mn < Cu < Ni < Zn.