Abstract
The iron(II) and (III) complexes formed by polygalaturonic acid have been investigated by means of Mössbauer and ESR spectra. It is observed that the binding of iron(II) is independent on the water content of the samples. In fact, different hexacoordinated species are revealed by Mössbauer spectra in fully hydrated, air-dried and anhydrous samples. On the other hand, iron(III) ions give rise to polynuclear structures, which are not destroyed upon salvation and are stable over a wide pH range. The results provide plausible explanation of the mechanisms governing the iron uptake and transport in plants.
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