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    Thermal stability of the FeIIIEDTA complex in its monomeric form

    Access Status
    Fulltext not available
    Authors
    Szilagyi, Petra
    Madarasz, J.
    Kuzmann, E.
    Vértes, A.
    Molnár, G.
    Bousseksou, A.
    Sharma, V.
    Homonnay, Z.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Szilagyi, P. and Madarasz, J. and Kuzmann, E. and Vértes, A. and Molnár, G. and Bousseksou, A. and Sharma, V. et al. 2008. Thermal stability of the FeIIIEDTA complex in its monomeric form. Thermochimica Acta. 479: pp. 53-58.
    Source Title
    Thermochimica Acta
    Additional URLs
    http://www.sciencedirect.com/science/article/pii/S0040603108002827#
    ISSN
    00406031
    URI
    http://hdl.handle.net/20.500.11937/19569
    Collection
    • Curtin Research Publications
    Abstract

    Thermal degradation of the solid monomeric Na[FeEDTA(H2O)]·2H2O EDTA=ethylenediaminetetraacetate anion) complex was studied in air by simultaneous thermogravimetry and differential thermal analysis (TG/DTA) coupled on-line with a quadrupole mass spectrometer for evolved gas analysis (EGA-MS). The solid products were analysed by Mössbauer spectroscopy. A four-step decomposition was observed until 500 ?C by TG/DTA–EGA-MS, involving first the release of two molecules of crystal lattice water then one coordinatedwater molecule and above 200 ?C, the release of CO2 as a result of degradation of a carboxylate arm of the EDTA ligand. While releasing CO2, reduction of the ferric iron to ferrous iron was observed by Mössbauer spectroscopy. Two ferrous species have been found to form simultaneously which are assumed to be configurational isomers since their aerial oxidation resulted in the formation of the same -oxo dimeric iron(III) species. Reaction pathway for this oxidation is proposed. Finally, the organic residues are burnt out rapidly accompanied by a very sharp exothermic heat effect between 280 and 330 ?C; meanwhile magnetite is formed.

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