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Mössbauer, vibrational spectroscopic and solution X-ray diffraction studies of the structure of iron(III) complexes formed with indole-3-alkanoic acids in acidic aqueous solutions

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Abstract

The chemical reactions between iron(III) and indole-3-acetic (IAA), -propionic (IPA), and -butyric (IBA) acids were studied in acidic aqueous solutions. The motivation of this work was that IAA is one of the most powerful natural plant-growth-regulating substances (phytohormones of the auxin series). Mössbauer spectra of the frozen aqueous solutions of iron(III) with indole-3-alkanoic acids as ligands (L), showed parallel reactions between Fe3+ and the ligands. Partly, it resulted in a complex formation which precipitated in aqueous solution and partly, in a redox process with iron(II) and the oxidised indole-3-alkanoic acids as products. The Mössbauer parameters of the Fe2+ species suggested a hexaaquo coordination environment. The chemical composition and coordination structure of the precipitated complexes were investigated using elemental analysis, Mössbauer spectroscopy, Fourier transform infrared (FTIR) and Raman spectroscopic techniques. The complexes were soluble in some organic solvents. So, Mössbauer, FTIR and solution X-ray diffraction measurements were carried out on the solution of complexes in acetone, hexadeutero acetone and methanol, respectively. The data obtained supported the existence of the μ-dihydroxo-bridging structure of the dimer: [L2Fe<(OH)2>FeL2] (where L is indole-3-propionate, -acetate or -butyrate).

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Acknowledgements

The authors are grateful to Professor G. Pálinkás (Budapest, Hungary), Dr. P. A. Tarantilis (Athens, Greece) and Dr. A. G. Shchelochkov (Saratov, Russia) for many stimulating discussions and to L. Hajba for recording the far-infrared spectra.

This work was supported in parts by The Hungarian Science Foundation (OTKA Grant T43687), NATO (Expert Visit Grants LST.EV.980141 and CBP.NR.NREV.981748; Collaborative Linkage Grants LST.CLG.977664 and LST.NR.CLG.981092), Russian Academy of Sciences’ Commission (Grant No. 205 under the 6th Competition-Expertise of research projects), as well as under the Agreements on Scientific Cooperation between the Russian and Hungarian Academies of Sciences for 2002–2004 and 2005–2007.

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Authors and Affiliations

  1. Research Group for Nuclear Techniques in Structural Chemistry, Hungarian Academy of Sciences; Department of Nuclear Chemistry, Eötvös Loránd University, 1518, Budapest 112, Hungary

    Krisztina Kovács, Ernő Kuzmann & Attila Vértes

  2. Laboratory of Biochemistry of Plant-Bacterial Symbioses, Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 410049, Saratov, Russia

    Alexander A. Kamnev

  3. Chemical Research Center of the Hungarian Academy of Sciences, 1525, Budapest, P.O. Box 77, Hungary

    János Mink, Csaba Németh, Tünde Megyes & Tamás Grósz

  4. Analytical Chemistry Research Group, Hungarian Academy of Sciences and Faculty of International Technology, Research Institute of Chemical and Process Engineering, University of Veszprém, Veszprém, 8200, Hungary

    János Mink

  5. Research Group of Peptide Chemistry, Department of Organic Chemistry, Eötvös Loránd University, 1518, Budapest 112, Hungary

    Hedvig Medzihradszky-Schweiger

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  1. Krisztina Kovács
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  2. Alexander A. Kamnev
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  8. Hedvig Medzihradszky-Schweiger
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  9. Attila Vértes
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Correspondence to Alexander A. Kamnev.

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Kovács, K., Kamnev, A.A., Mink, J. et al. Mössbauer, vibrational spectroscopic and solution X-ray diffraction studies of the structure of iron(III) complexes formed with indole-3-alkanoic acids in acidic aqueous solutions. Struct Chem 17, 105–120 (2006). https://doi.org/10.1007/s11224-006-9005-5

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  • DOI: https://doi.org/10.1007/s11224-006-9005-5

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