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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation
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Dinuclear iminophenoxide copper complexes in rac-lactide polymerisation

机译:在Rac丙交酯聚合中的核核氧化铜配合物

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Dinuclear bis(R'-(R''-iminomethyl) phenoxide) copper complexes L2Cu2(mu-OR)(2) were prepared from the reaction of copper methoxide with ROH and LH (ROH = dimethylaminoethanol or pyridylmethanol, R' = H, 4,6-tBu, 1,3-Cl, R'' = benzyl, cyclohexyl, diphenylmethyl and 2,6-dimethylphenyl). Preparation was complicated by formation of homoleptic L2Cu and only 9 of the 24 possible combinations could be prepared. All complexes were characterized by single crystal X-ray diffraction studies and crystallized as dinuclear penta-coordinated complexes. Homoleptic complexes L2Cu were inactive in lactide polymerization at room temperature. Most heteroleptic complexes showed modest to good activities with full conversion in less than 6 h at room temperature. Complexes with R' = H showed poor molecular weight control, complexes with R' = Cl were inactive in polymerization. In pyridylmethoxide-containing complexes, only one alkoxide initiated chain growth. All complexes produced atactic polymer.
机译:二核双(R' - (R' - Iminomethyl)酚类亚氧化铜络合物L2CU2(MU-OR)(2)由甲甲醇铜的反应与ROH和LH(ROH =二甲基氨基乙醇或吡啶基甲醇,R'= H, 4,6-TBU,1,3- Cl,R''=苄基,环己基,二苯基甲基和2,6-二甲基苯基)。 制备通过形成淘汰的L2Cu并可制备24种可能的组合中的9个。 所有复合物的特征在于单晶X射线衍射研究,并作为硫核化术术配合物结晶。 将络合物L2CU在室温下在丙交酯聚合中无活性。 大多数异质复合物在室温下少于6小时,良好的活性均为良好的活性。 与R'= H的复合物显示出差的分子量控制,与R'= Cl的复合物在聚合中无活性。 在含吡啶甲象的络合物中,只有一种醇盐引发的链生长。 所有复合物都产生了attactic聚合物。

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