期刊
INORGANIC CHEMISTRY
卷 53, 期 2, 页码 716-726出版社
AMER CHEMICAL SOC
DOI: 10.1021/ic401459a
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资金
- National Natural Science Foundation of China [21071069, 21171078, 21271092]
- State Education Ministry and Fundamental Research Funds of the Central Universities of China [lzujbky-2012-67]
- Project for National Basic Science Personnel Training Fund [J1103307]
Trinuclear and tetranuclear magnesium alkoxide clusters supported by bulky phenolates with triangular or rhombic structures were readily synthesized in acceptable yields via the reaction of 2-N,N-dimethylaminoethanol/methoxyethanol, different phenols, and dibutylmagnesium. These complexes have been characterized using H-1 and C-13 NMR, elemental analyses, and X-ray crystallography. The experimental results indicate that these clusters are efficient and excellent initiators for the ring-opening polymerizations (ROPs) of L-lactide (LA) and afford polylactides with desired molecular weights and narrow polydispersity indexes (PDIs). Complex 2 can even catalyze the ROP of 4000 equiv of L-lactide in 1 min in a controlled model. Kinetic studies indicate that the polymerization is first-order for both the trinuclear magnesium complex 3 and LA. However, for the tetranuclear magnesium complex 5, the polymerization rate is first order for 5 and second order for LA.
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