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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Remarkable effect of alkali metal on polymerization of cyclic esters catalyzed by samarium-alkali metal multinuclear alkoxide clusters
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Remarkable effect of alkali metal on polymerization of cyclic esters catalyzed by samarium-alkali metal multinuclear alkoxide clusters

机译：碱金属对sa-碱金属多核醇盐簇催化环酯聚合的显着影响

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摘要

The remarkable effect of alkali metal on catalytic reactivity of samarium-alkali metal multinuclear alkoxide clusters is systematically studied. Three samarium-alkali metal multinuclear alkoxide clusters are synthesized in high yield by the reaction of anhydrous SmCl _3 with different molar ratios of alkali metal alkoxide and MOH (M = Na or K) in tetrahydrofuran (THF). These clusters were fully characterized by elemental analysis, IR, ~1H NMR and single-crystal structural analysis. These clusters exhibited good catalytic activity for the ring-opening polymerization of ε-caprolactone (ε-CL), l-lactide (l-LA) and trimethylene carbonate (TMC). It is interesting to note that the catalytic activity is much influenced by the alkali metals of the clusters. For the polymerization of these cyclic esters, the catalytic activities all increase with the increase of the molar ratio of alkali metal to samarium metal.
机译：系统地研究了碱金属对sa-碱金属多核醇盐簇的催化反应性的显着影响。通过无水SmCl _3与四氢呋喃（THF）中碱金属醇盐和MOH（M = Na或K）的摩尔比不同的无水SmCl _3反应，可以高收率合成三个sa碱金属多核醇盐簇。通过元素分析，IR，〜1H NMR和单晶结构分析充分表征了这些簇。这些簇对ε-己内酯（ε-CL），1-丙交酯（1-LA）和碳酸三亚甲基酯（TMC）的开环聚合表现出良好的催化活性。有趣的是，催化活性受簇中碱金属的影响很大。对于这些环状酯的聚合，催化活性都随着碱金属与sa金属的摩尔比的增加而增加。

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