Synthesis and characterization of conducting polypyrrole-containing iron complexes |
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| Institution: | 1. Department of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland;2. Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00-818, Warsaw, Poland;3. National Medicines Institute, Chełmska 30/34, 00-725, Warsaw, Poland;4. Mossakowski Medical Research Centre, Polish Academy of Sciences, Pawińskiego 5, 02-106, Warsaw, Poland;1. Department of Food Science, University of Guelph, Guelph, Ontario, Canada;2. School of Engineering, University of Guelph, Guelph, Ontario, Canada;3. Department of Engineering, University of Waterloo, Waterloo, Ontario, Canada;1. Department of Aquatic Ecology, Eawag, Dübendorf, Switzerland;2. Université des Sciences et Techniques de Franche-Comté, Besançon, France;3. Department of Experimental Limnology, Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Stechlin, Germany;4. Department of Environmental Science, ETH, Zurich, Switzerland;5. Department of Ecology, Berlin Institute of Technology (TU Berlin), Berlin, Germany;1. School Of Chemistry And Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan 60800, Pakistan;3. Department of Chemistry, COMSATS University Islamabad, Abbotabad Campus, Abbottabad 22060, Pakistan |
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| Abstract: | Electrochemical or chemical oxidation of pyrrole-containing complex anions of iron cyanide or iron chloride results in the formation of films or powders of conducting polypyrroles. Freshly prepared films exhibit an additional IR band at ca 1630–1640 cm−1, slowly disappearing in air and not observed in previously studies polypyrrole-based systems. It is possible that this new band is associated with the existence of a CN bond in dehydrogenated pyrrole rings which are transformed into regular pyrrole rings, probably due to the protonation reaction occurring in air and simultaneous bond rearrangement. The polypyrrole structure favours the presence of Fe(CN)64− over Fe(CN)63− since the former is the only iron species detected by Mössbauer spectroscopy in electrochemically prepared samples. It is also the dominant iron species in the samples oxidized chemically. The polypyrrole-containing Fe(CN)64− is more ordered than those containing monovalent anions, as evidence by X-ray diffraction studies. High-spin eron complexes can be inserted into polypyrrole during electrochemical oxidation of pyrrole in non-aqueous solutions containing LiCl/FeCl3. The inserted species exhibit Mössbauer parameters characteristic of slightly distorted FeCl4−. |
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