Indium-alkyl NCN pincer complexes supported by amine and imine donors are active catalysts for the ring opening polymerization of lactide. The amine indium complexes are significantly more active for polymerization due to the decoordination of the amine donors at higher temperatures. Solid state structures of the imine and amine indium complexes indicate that the imine–indium bonds are stronger than the analogous amine–indium bonds. Higher molecular weight polymers that were not observable by MALDI-TOF were shown to be linear by comparing their intrinsic viscocities with those of known linear polymers. The alkyl indium complexes are more active than the analogous alkyl aluminum complexes but are prone to transesterification reactions.

中文翻译：

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烷基引发由铟配合物在NCN钳形配体负载下的丙交酯开环聚合


由胺和亚胺供体负载的铟-烷基 NCN 钳形配合物是丙交酯开环聚合的活性催化剂。胺-铟配合物在较高温度下的配位作用明显更强于聚合。亚胺和胺铟配合物的固态结构表明，亚胺-铟键比类似的胺-铟键更强。通过将 MALDI-TOF 无法观察到的高分子量聚合物的特性粘度与已知线性聚合物的特性粘度进行比较，显示它们是线性的。烷基铟配合物比类似的烷基铝配合物更活泼，但容易发生酯交换反应。