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Iron chelates: a challenge to chemists and Mössbauer spectroscopists

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Authors
Homonnay, Z.
Szilagyi, Petra
Vértes, A.
Kuzmann, E.
Sharma, V.
Molnár, G.
Bousseksou, A.
Grenèche, J.
Brausam, A.
Meier, R.
van Eldik, R.
Date
2008
Type
Conference Paper

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Homonnay, Z. and Szilagyi, P. and Vértes, A. and Kuzmann, E. and Sharma, V. and Molnár, G. and Bousseksou, A. et al. 2008. Iron chelates: a challenge to chemists and Mössbauer spectroscopists, in N. S. Gajbhiye, S. K. Date (ed), 29th International Conference on the Applications of the Mössbauer Effect (ICAME 2007), Oct 14 2007, pp. 77-86. Kanpur, India: Springer.
Source Title
Hyperfine Interactions
Source Conference
29th International Conference on the Applications of the Mössbauer Effect (ICAME 2007)
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Abstract

The speciation of iron in aqueous solutions containing Fe3+ and selectedchelates such as EDTA, EDDA, CDTA and HEDTA has been studied using transmission57Fe Mössbauer spectrometry in frozen solutions. The protonation of variouscomplexes as well as binuclear complex formation could be detected as a function ofpH. Autoreduction of Fe3+ to Fe2+ was observed in several cases. Reaction withhydrogen peroxide proved to be rather different for the four ligands, while thedihapto complex [XFe(?2-O2)]3- had surprisingly identical Mössbauer parametersfor X = EDTA, CDTA or HEDTA. Paramagnetic spin relaxation observed in the Mössbauer spectra was found to be strongly influenced by the identity of thechelating ligand, despite the basically spin-spin origin of the phenomenon.