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首页> 外文期刊>Inorganic Chemistry Communications >Pd-Salen and Pd-Salan complexes: Characterization and application in styrene polymerization
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Pd-Salen and Pd-Salan complexes: Characterization and application in styrene polymerization

机译：Pd-Salen和Pd-Salan配合物：表征及其在苯乙烯聚合中的应用

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摘要

Two new Pd~(2+) complexes based on the Salen-type H2L~1 or Salan-type H2L~2 ligand (H2L~1=N,N'-Bis(3-methoxy-salicylidene)phenylene-1,2-diamine), H2L~2 = 1,2-Bis(2-hydroxyl-3-rnethoxy-phenyl)rnethyla-mino-benzene), were synthesized and characterized by FT-IR, ~1H NMR and X-ray crystallography. They were shown to catalyze the polymerization of styrene, giving the syndio-enriched atactic polystyrenes with moderate molecular weights and narrow molecular weight distributions. The detailed stereoregular analysis of the polymeric products shows that the slight increase in electrophilicity or Lewis acidity of active species by the reduction from Salen-type to Salan-type ligand endows the distinctive increase of the stereoselectivities besides the increase of the catalytic activities.
机译：基于Salen型H2L〜1或Salan型H2L〜2配体的两个新的Pd〜（2+）配合物（H2L〜1 = N，N'-双（3-甲氧基-水杨基）亚苯基-1,2-合成了H2L〜2 = 1,2-双（2-羟基-3-3-乙氧基-苯基）甲基乙基-氨基-苯胺）并通过FT-IR，〜1H NMR和X射线晶体学进行了表征。它们被显示出催化苯乙烯的聚合反应，从而得到中等分子量和窄分子量分布的富含间苯二酚的无规立构聚苯乙烯。聚合物产物的详细立体规整分析表明，通过从Salen型配体还原​​为Salan型配体，活性物种的亲电子性或Lewis酸度略有提高，除了催化活性的提高外，还显着提高了立体选择性。

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