Poly(o-toluidine) as the matrix for incorporation of palladium species from PdCl₂ aqueous solutions

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• 作者：Hasik ; Magdalena ; Wenda ; Elzbieta ; Bernasik ; Andrzej ; Kowalski ; Kazimierz ; Sobczak ; Janusz W. ; et. al.
• 关键词：Poly(o-toluidine) ; Palladium ; Polyaniline derivatives
• 刊名：Polymer
• 出版年：2003
• 出版时间：December, 2003
• 年：2003
• 卷：44
• 期：2
• 页码：7809-7819
• 全文大小：882 K

文摘

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.