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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Gallium and indium complexes containing the bis(imino)phenoxide ligand: synthesis, structural characterization and polymerization studies
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Gallium and indium complexes containing the bis(imino)phenoxide ligand: synthesis, structural characterization and polymerization studies

机译：含双（亚氨基）酚盐配体的镓和铟配合物：合成，结构表征和聚合研究

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摘要

A series of gallium and indium complexes containing a bis(imino) phenolate ligand framework were synthesized and completely characterized with different spectroscopic techniques. The molecular structures of a few complexes were determined using single crystal X-ray diffraction studies. These compounds were found to be extremely active towards the bulk ring opening polymerization (ROP) of lactides yielding polymers with high number average molecular weight (M-n) and controlled molecular weight distributions (MWDs). The neutral complexes 1-8 produce isotactic enriched poly(lactic acid) (PLA) from rac-lactide (rac-LA) under melt conditions, whereas the ionic complex 9 produces atactic PLA. The polymerizations are controlled, as evidenced by the narrow molecular distribution (MWDs) of the isolated polymers in addition to the linear nature of number average molecular weight (M-n) versus conversion plots with variations in monomer to catalyst ratios. The kinetic and mechanistic studies associated with these polymerizations have been performed.
机译：合成了一系列含有双（亚氨基）酚盐配体骨架的镓和铟配合物，并用不同的光谱技术对其进行了完全表征。使用单晶X射线衍射研究确定了一些配合物的分子结构。发现这些化合物对丙交酯的本体开环聚合（ROP）具有极高的活性，从而产生具有高数均分子量（M-n）和受控分子量分布（MWD）的聚合物。中性配合物1-8在熔融条件下由rac-丙交酯（rac-LA）产生等规富集的聚乳酸（PLA），而离子配合物9产生无规PLA。如数均分子量（M-n）对转化率的线性关系以及单体与催化剂比例的变化的线性关系所证明的，分离的聚合物的窄分子分布（MWD）证明聚合是受控的。已经进行了与这些聚合反应有关的动力学和机理研究。

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