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http://ir.ncue.edu.tw/ir/handle/987654321/18879
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| Title: | Copolymerization of Carbon Monoxide with Ethene Catalyzed by Bis-palladium (II) Complexes Containing Diphosphine and Dinitrogen Ligands |
| Authors: | Claudio Bianchini;Lee, Hon Man;Pierluigi Barbaro;Andrea Meli;Simonetta Moneti;Francesco Vizza |
| Contributors: | 化學系 |
| Date: | 1999
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| Issue Date: | 2014-08-14T04:28:31Z
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| Publisher: | Royal Society of Chemistry |
| Abstract: | Several bis-chelated palladium(II) complexes, [Pd(P-P)(N-N)x](PF6)2, containing binary combinations of diphosphine and dinitrogen ligands have been prepared and characterized. The diphosphine ligands comprise 1,3-bis(diphenylphosphino)propane (dppp), meso-2,4-bis(diphenylphosphino)pentane (meso-bdpp), rac-2,4-bis(diphenylphosphino)pentane (rac-bdpp) and 2,2′-bis(diphenylphosphinoethyl)pentane (Etdppp), while the dinitrogen ligands are either 2,2′-bipyridine (bipy; x=1) or 1,8-naphthyridine (napy; x=2). The structure of [Pd(meso-bdpp)(N,N′-bipy)](PF6)2·CH2Cl2 has been determined by an X-ray structural analysis. All the Pd(II) complexes have been tested as catalyst precursors for the copolymerization of carbon monoxide and ethene in methanol solution in either autoclaves or high-pressure sapphire NMR tubes. The combination of meso-bdpp and bipy at palladium, in conjuction with both 1,4-benzoquinone and p-toluenesulfonic acid, has shown the best catalytic performance. The different catalytic activities exhibited by the stereoisomers [Pd(meso-bdpp)(N,N′-bipy)]- (PF6)2 and [Pd(rac-bdpp)(N,N′-bipy)](PF6)2 has been interpreted in terms of the different spatial distribution of the phenyl rings around the metal center determined by the conformation of the six-membered metallaring. |
| Relation: | New Journal of Chemistry, 23(9): 929-938 |
| Appears in Collections: | [化學系] 期刊論文
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