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Poly(o-toluidine) as the matrix for incorporation of palladium species from PdCl2 aqueous solutions |
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| Authors: | Magdalena Hasik El?bieta WendaAndrzej Bernasik Kazimierz KowalskiJanusz W. Sobczak Ewa Sobczak El?bieta Bielańska |
| Affiliation: | a Department of Materials Science and Ceramics, AGH-University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland b Department of Chemistry, Jagiellonian University, Ul. Ingardena 3, 30-060, Kraków, Poland c Department of Physics and Nuclear Techniques, AGH-University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland d Faculty of Metallurgy and Materials Science, AGH-University of Science and Technology, Al. Mickiewicza 30, 30-059, Kraków, Poland e Institute of Physical Chemistry PAS, ul. Kasprzaka 44, 01-224, Warszawa, Poland f Center for Theoretical Physics PAS, Al. Lotników 32/46, 02-668, Warszawa, Poland g Institute of Physics PAS, Al. Lotników 32/46, 02-668, Warszawa, Poland h Institute of Metallurgy and Materials Science PAS, 25 Reymonta Street, 30-059, Kraków, Poland |
| Abstract: | Reactivity of poly(o-toluidine) in the emeraldine base form (POT) and protonated with HCl (POT/HCl) in PdCl2 aqueous solutions of various HCl concentrations has been studied. Using elemental analysis, FTIR, UV–Vis, XPS and EXAFS spectroscopies as well as XRD and SEM it has been established that POT/HCl is more reactive than POT. The course of reactions is influenced by the type of the PdCl2 solution. Thus, protonation of POT with incorporation of palladium (II) chloro–and/or aquachloro–and/or chlorohydroxycomplexes counterions is the main process occurring in the PdCl2 solutions of higher HCl concentration. A redox reaction resulting in the oxidation of the polymer chain with simultaneous formation of metallic palladium takes place in the PdCl2 solution of lower HCl concentration. POT/HCl shows enhanced reducing properties with respect to POT. Lowering of the protonation level (i.e. some deprotonation) of POT/HCl has been also observed. Coordination of palladium (II) ions by nitrogen atoms of the polymer chain can be also postulated. |
| Keywords: | Poly(o-toluidine) Palladium Polyaniline derivatives |
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