Robust Y and Lu TrenSal catalysts for ring-opening polymerisation

IF 2.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron Pub Date : 2024-11-17 DOI:10.1016/j.poly.2024.117308

Eszter Fazekas , Alvaro Etcheverry-Berrios , Gary S. Nichol , Stergios Piligkos , Euan K. Brechin , Jennifer A. Garden

引用次数: 0

Abstract

Mono and bimetallic cage-like TrenSal complexes based on rare-earth metals Y and Lu were synthesised and fully characterised by single crystal and powder X-ray diffraction, multinuclear NMR and IR spectroscopy, and MALDI-ToF mass spectrometry. These robust and air-stable complexes are active catalysts for the ring-opening polymerisation of rac-lactide. While the polymerisation activity is low, the complexes remain active in air using unpurified monomers, and are highly unusual examples of metal–organic cages applied in polymerisation. MALDI-ToF mass spectrometry studies of the obtained polymers revealed H and OBn end-capped chains suggesting that an ‘activated monomer’ mechanism predominates when BnOH is used as an exogenous initiator.

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用于开环聚合反应的强效 Y 和 Lu TrenSal 催化剂

通过单晶和粉末 X 射线衍射、多核核磁共振和红外光谱以及 MALDI-ToF 质谱法，合成了基于稀土金属 Y 和 Lu 的单金属笼状 TrenSal 复合物和双金属笼状 TrenSal 复合物，并对其进行了全面表征。这些坚固且在空气中稳定的复合物是 rac-lactide 开环聚合反应的活性催化剂。虽然聚合活性较低，但使用未净化的单体时，这些复合物在空气中仍能保持活性，是将金属有机笼应用于聚合反应的极不寻常的例子。对获得的聚合物进行的 MALDI-ToF 质谱研究显示，H 和 OBn 端封端链表明，当 BnOH 用作外源引发剂时，"活化单体 "机制占主导地位。

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来源期刊

Polyhedron 化学-晶体学

CiteScore

4.90

自引率

7.70%

发文量

515

审稿时长

2 months

期刊介绍： Polyhedron publishes original, fundamental, experimental and theoretical work of the highest quality in all the major areas of inorganic chemistry. This includes synthetic chemistry, coordination chemistry, organometallic chemistry, bioinorganic chemistry, and solid-state and materials chemistry. Papers should be significant pieces of work, and all new compounds must be appropriately characterized. The inclusion of single-crystal X-ray structural data is strongly encouraged, but papers reporting only the X-ray structure determination of a single compound will usually not be considered. Papers on solid-state or materials chemistry will be expected to have a significant molecular chemistry component (such as the synthesis and characterization of the molecular precursors and/or a systematic study of the use of different precursors or reaction conditions) or demonstrate a cutting-edge application (for example inorganic materials for energy applications). Papers dealing only with stability constants are not considered.