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Journal of Thermal Analysis and Calorimetry

, Volume 91, Issue 2, pp 609–613 | Cite as

Thermoanalytical investigations of 4-methylpiperazine-1-carbodithioic acid ligand and its iron(III), cobalt(II), copper(II) and zinc(II) complexes

  • S. B. Kalia
  • G. Kaushal
  • K. Lumba
  • Priyanka
Article

Abstract

The thermal decomposition studies on 4-methylpiperazine-1-carbodithioic acid ligand (4-MPipzcdtH) and its complexes, viz. [M(4-MPipzcdtH)n](ClO4)n (M=Fe(III) when n=3; M=Co(II), Cu(II) when n=2) and [Zn(4-MPipzcdtH)2]Cl2 have been carried out using non-isothermal techniques (TG and DTA). Initial decomposition temperatures (IDT), indicate that thermal stability is influenced by the change of central metal ion. Free acid ligand exhibits single stage decomposition with a sharp DTA endotherm. Complexes, [M(4-MPipzcdtH)n](ClO4)n undergo single stage decomposition with detonation and give rise to very sharp exothermic DTA curves while the complex [Zn(4-MPipzcdtH)2]Cl2 shows three-stage decomposition patterns.

The kinetic and thermodynamic parameters, viz. the energy of activation E, the frequency factor A, entropy of activation S and specific rate constant k, etc. have been evaluated from TG data using Coats and Redfern equation. Based upon the results of the differential thermal analysis study, the [M(4-MPipzcdtH)n](ClO4)n complexes have been found to possess characteristic of high energy materials.

Keywords

Coats-Redfern method DTA metal ions 4-methylpiperazine-1-carbodithioate TG 

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Copyright information

© Springer Science+Business Media, LLC. 2008

Authors and Affiliations

  • S. B. Kalia
    • 1
  • G. Kaushal
    • 1
  • K. Lumba
    • 1
  • Priyanka
    • 1
  1. 1.Department of ChemistryHimachal Pradesh UniversityShimlaIndia

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