Design and synthesis of 4,4᾿disubstituted-[2,2′]-bipyridines for catalyzing CO/styrene copolymerization with palladium(II)
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- 作者：Jintang Guo 郭锦桿/a> ; Peiyun Yu 郁培丿/a> ; Haixia Wang 王海隿/a>…
- 关键词：bipyridine ; CO/styrene copolymerization ; palladium(II)complex ; polyketone
- 刊名：Transactions of Tianjin University
- 出版年：2015
- 出版时间：October 2015
- 年：2015
- 卷：21
- 期：5
- 页码：406-411
- 全文大小：490 KB
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Peiyun Yu 郁培云 (1)
Haixia Wang 王海霞 (1)
Haiyang Zhao 赵海洋 (1)
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China - 刊物类别：Engineering
- 刊物主题：Chinese Library of Science
- 出版者：Tianjin University
- ISSN：1995-8196
文摘
A series of 4,4’-disubstituted-[2,2’]-bipyridines, featuring electron withdrawing/donating functional groups such as amino, chloro, nitro, ethoxycarbonyl, carboxy, methyl, methoxy and hydroxymethyl, have been synthesized and employed in the copolymerization of carbon monoxide(CO)and styrene. The available bipyridine and its derivatives were coordinated with palladium(II)acetate for catalyzing the copolymerization of CO and styrene, and the concomitant polyketone was characterized by means of 13C NMR, FTIR, differential scanning calorimetry( DSC)and element analysis techniques concerning its structure and thermal performance. The effect of different electron-donating and electron-withdrawing groups on catalyst performance and molecular weight of copolymer was studied under certain experimental condition. It has been proved that the enhancement of electron donating and conjugative effects on bipyridine ligand will not only improve the catalytic activity of the composition, but also increase the molecular weight of the as-prepared polyketone. The catalytic activity is the highest in hydroxymethyl substituted 2,2’-bipyridine ligand(1 356 gSTCO/(gPd · h)), when the molecular weight and polydispersity index of the polyketone are M n=8 502,M w=1 3440 and M w/M n=1.581, respectively.