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Journal of Thermal Analysis and Calorimetry

, Volume 106, Issue 1, pp 267–275 | Cite as

Thermal behaviour of nickel(II) sulphate, nitrate and halide complexes containing ammine and ethylenediamine as ligands

Kinetics and evolved gas analysis
  • K. S. Rejitha
  • Suresh MathewEmail author
Article

Abstract

Thermal behaviour of nickel amine complexes containing SO4 2−, NO3 , Cl and Br as counter ions and ammonia and ethylenediamine as ligands have been investigated using simultaneous TG/DTA coupled with mass spectroscopy (TG/DTA–MS). Evolved gas analyses detected various transient intermediates during thermal decomposition. The nickel ammonium sulphate complex produces NH, N, S, O and N2 species. The nickel ammonium nitrate complex generated fragments like N, N2, NO, O2, N2O, NH2 and NH. The halide complexes produce NH2, NH, N2 and H2 species during decomposition. The ligand ethylenediamine is fragmented as N2/C2H4, NH3 and H2. The residue hexaamminenickel(II) sulphate produces NiO with crystallite size 50 nm. Hexaammine and tris(ethylenediamine)nickel(II) nitrate produce NiO in the range 25.5 nm and 23 nm, respectively. The halide complexes produce nano sized metallic nickel (20 nm) as the residue. Among the complexes studied, the nitrate containing complexes undergo simultaneous oxidation and reduction.

Keywords

Kinetic parameters Nickel amine complexes Non-mechanistic equations Thermal behaviour 

Notes

Acknowledgements

The authors are grateful to Prof. T. Ichikawa, the Institute for Advanced Materials Research, Hiroshima University, Japan, for the TG–MS analyses.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2011

Authors and Affiliations

  1. 1.School of Chemical SciencesMahatma Gandhi UniversityKottayamIndia

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