Journal of Thermal Analysis and Calorimetry

, Volume 102, Issue 3, pp 931–939 | Cite as

Thermoanalytical investigations of tris(ethylenediamine)nickel(II) oxalate and sulphate complexes

TG–MS and TR–XRD studies
  • K. S. Rejitha
  • Suresh MathewEmail author


Investigations on the thermal behaviour of [Ni(en)3]C2O4·2H2O and [Ni(en)3]SO4 have been carried out in air and helium atmosphere. Simultaneous TG/DTA coupled online with mass spectroscopy (MS) in helium atmosphere detected the presence of H2, O, CO, N2/CH2=CH2 and CO2 fragments during the decomposition of tris(ethylenediamine)nickel(II) oxalate and H2, O, NH, NH2, NH3 and N2/CH2=CH2 fragments for tris(ethylenediamine)nickel(II) sulphate complex. The thermal events during the decomposition were monitored by temperature-resolved X-ray diffraction. In air, both the complexes give nickel oxide as the final product of the decomposition. In helium atmosphere, tris(ethylenediamine)nickel(II) oxalate gives nickel as the residue, whereas tris(ethylenediamine)nickel(II) sulphate gives a mixture of nickel and nickel sulphide phases as the final residue. Kinetic analyses of these complexes by isoconversional methods are discussed and compared.


Mass spectroscopy Temperature resolved X-ray diffraction Kinetic analysis Isoconversional method 



The authors are grateful to the Sophisticated Test and Instrumentation Centre (STIC), Cochin, for recording TR–XRD patterns. The authors are also grateful to Prof. T. Ichikawa, Institute for Advanced Materials Research, Hiroshima University, Japan, for the TG–MS analyses.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2010

Authors and Affiliations

  1. 1.School of Chemical SciencesMahatma Gandhi UniversityKottayamIndia

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