Polyamide-bound metal complex catalysts: Synthesis,characterization and catalytic properties |
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| Affiliation: | 1. School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India;2. Special Center for Nanosciences, Jawaharlal Nehru University, New Delhi 110067, India;3. Inter University Accelerator Centre (IUAC), New Delhi 110067, India;1. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Sklodowska Str., 41-819 Zabrze, Poland;2. Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland;3. Institute of Electron Technology, Al. Lotnikow 32/46, 02-668 Warszawa, Poland;4. Faculty of Physics, Warsaw University of Technology, 75 Koszykowa Str., 00-662 Warszawa, Poland;1. National Research Institute of Police Science, 6-3-1 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan;2. Medical Plant Garden, Tokyo Metropolitan Institute of Public Health, 21-1 Nakajimacho, Kodaira, Tokyo 187-0033, Japan;1. Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350116, China;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;1. College of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan, 430205, China;2. College of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan, 430205, China;3. College of New Energy and Materials, China University of Petroleum (Beijing), Beijing, 102249, China;4. Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Wuhan, 430205, China |
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| Abstract: | A series of polyamides having different numbers of methylene groups in their repeating units have been synthesized by interfacial polycondensation of terephthaloyl chloride with piperazine and aliphatic diamines H2N(CH2)nNH2 (n = 2, 6, 10). These materials, which have high thermal stability, were used for immobilization of rhodium and platinum complexes. Chloroplatinic acid and the compounds PtCl2(CH3CN)2 and [RhCl(CO)2]2 were used as precursors of the supported catalysts. Low molecular weight analogues of the polyamides were prepared for a study of the coordination mode between the metal ion and the polymer by IR spectroscopy. The results suggest that the carbonyl oxygen of the polyamide is the site of coordination to both rhodium and platinum. The bound catalysts exhibited high activity in hydrosilylation of hexene-1. The activities of the rhodium complexes were found to be dependent on the structure of the polyamide support, decreasing with increasing distance between the amide groups, and closely paralled the changes in the degree of crystallinity of the polymers. Repeated use of the polymers bearing rhodium complexes showed that the bond between the metal and polyamide is fairly stable. |
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