Abstract:
Three new iron (III) coordination polymers, namely {Fe[(C2H5)(C4H9)PO2]3}n, {Fe[(C2H5)(C4H9)POS]3}n, and
{Fe[(C2H5)(C4H9)PS2]3}n have been synthesised using iron (III) acetylacetonate as iron precursor and a succession of ligands
derived from phosphinic acid: ethylbutyl-phosphinic acid, ethylbutylthio-phosphinic acid, and respectively ethylbutyldithiophosphinic
acid. Chemical analysis, gel-chromatography, infrared spectroscopy (IR), M?ssbauer spectroscopy, X-ray diffraction
(XRD) and thermal gravimetric analysis (TGA) have been used as characterization methods. Based on the experimental results
and on literature data the structures of the studied compounds were assigned. The organophosphinic acids were also tested as iron
chelators for water treatment.

Ioan Rosca, Mircea-Teodor Nechita∗, Daniel Sutiman, Adrian Cailean, Doina Sibiescu, Mihaela Vizitiu