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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Direct Synthesis of Ion-pair Lanthanide Borohydrides and their High Activity for Polymerization of L-Lactide and ε-Caprolactone
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Direct Synthesis of Ion-pair Lanthanide Borohydrides and their High Activity for Polymerization of L-Lactide and ε-Caprolactone

机译:离子对镧系硼氢化物的直接合成及其对L-丙交酯和ε-己内酯聚合的高活性

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摘要

The reactions of LnCl_3 (Ln = Nd, Pr, La) with NaBH_4 in a THF solution at 75 ℃ afforded ion-pair lanthanide borohydrides [Ln(BH_4)_2(THF)_5]~+[Ln(BH_4)_4(THF)_2]~- [Ln = Nd (1), Pr (2), La (3)] in high yields whilst similar reactions at 40 ℃ yielded the neutral borohydrides [Ln(BH_4)_3(THF)_3] [Ln = Nd (4), Pr (5), La (6)]. The influence of the size of the lanthanide metals on the synthesis of ionpair lanthanide borohydrides was observed. The same procedure with the middle and latter lanthanide metal chlorides as that for the synthesis of 1-3 did not afford the analogous complexes, but the neutral lanthanide borohydrides [Ln(BH_4)_3(THF)_3] [Ln = Sm (7), Eu (8), Yb (9)] were isolated. Complexes 1-3 showed high activity for the ring-opening polymerizations of ε-caprolactone (ε-CL) and l-Lactide (l-LA). The comparable study on the reactivity between 1 and 4 revealed that 1 showed somewhat higher activity than 4 in all the polymerizations studied, but no quite difference in chemistry behavior between the two complexes.
机译:LnCl_3(Ln = Nd,Pr,La)与NaBH_4在THF溶液中于75℃反应,得到离子对镧系元素硼氢化物[Ln(BH_4)_2(THF)_5]〜+ [Ln(BH_4)_4(THF) _2]〜-[Ln = Nd(1),Pr(2),La(3)]高产率,而在40℃下类似的反应产生中性硼氢化物[Ln(BH_4)_3(THF)_3] [Ln = Nd (4),Pr(5),La(6)]。观察到镧系金属的大小对离子对镧系元素硼氢化物的合成的影响。中间和后面的镧系金属氯化物与合成1-3所用的步骤相同,没有得到类似的络合物,但中性镧系元素硼氢化物[Ln(BH_4)_3(THF)_3] [Ln = Sm(7) ,Eu(8),Yb(9)]分离出来。配合物1-3对ε-己内酯(ε-CL)和1-丙交酯(1-LA)的开环聚合显示高活性。关于1和4之间的反应性的可比研究表明,在所有研究的聚合反应中1的活性都比4的活性高一些,但是两种络合物之间的化学行为差异不大。

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