Kinetic analyis of TF data, XXXV. Spectroscopic and thermal studies of some cobalt(III) chelates with ethylenediamine

J. Zsakó, G. Pokol, Cs Novák, Cs Várhelyi, A. Dobó, G. Liptay

Research output: Contribution to journalConference article

18 Citations (Scopus)

Abstract

A number of 30 [Co(en)3]Y3, [Co(en)2X2]Y and [Co(en)2X(amine)]Y2 type complexes (X=Cl, Br; Y=Cl, Br, I, NCO, NCS, NO3, ClO4, etc.; amine=aromatic and alkylamines) were obtained from trans-[Co(en)2Cl2]Cl by double decomposition and by substitution reactions, respectively. The structure of the complexes was proved by means of far and middle FTIR spectra. The thermal decomposition was studied by TG, DTA and DSC measurements. Mass spectra were also recorded. In the case of [Co(en)3]Y3 complexes the nitrate, perchlorate and dimesoperiodates decompose suddenly, frequently explosion like. The halides and thiocyanates seem to substitute an ethylenediamine ligand, yielding a rather unstable intermediate. The pyrolysis of [Co(en)2X2]Y type derivatives yields no relatively stable intermediates, but the decomposition temperatures may be correlated with the nature of Y and with the cis or trans configuration of the compound. With the [Co(en)2X(amine)]Y2 type complexes one observes the formation of [Co(en)2XY]Y as intermediate product. From the TG curves kinetic parameters were derived for some dehydration and deamination processes, by using the nomogram method. The validity of a nonlinear kinetic compensation law was observed.

Original languageEnglish
Pages (from-to)843-856
Number of pages14
JournalJournal of Thermal Analysis and Calorimetry
Volume64
Issue number2
DOIs
Publication statusPublished - Jan 1 2001
Event12th International Congress on Thermal Analysis and Calorimetry - Conpenhagen, Denmark
Duration: Aug 14 2000Aug 18 2000

Keywords

  • Cobalt(III) complexes
  • DSC
  • DTA
  • FTIR and IR spectra of Co(III) complexes
  • Kinetics
  • TG

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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