Lanthanum complexes containing a bis(phenolate) ligand with a ferrocene-1,1'-diyldithio backbone: synthesis, characterization, and ring-opening polymerization of rac-lactide.
Lanthanum complexes containing a bis(phenolate) ligand with a ferrocene-1,1'-diyldithio backbone: synthesis, characterization, and ring-opening polymerization of rac-lactide.
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DOI：
10.1039/c6dt00272b
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发表时间：
2016-05
影响因子：
4
通讯作者：
C. Hermans;Weifeng Rong;T. Spaniol;J. Okuda
中科院分区：
文献类型：
--
作者：
C. Hermans;Weifeng Rong;T. Spaniol;J. Okuda
合成了二茂铁基(Osso)型配体LH2负载的镧配合物[(L)Lax](X=N(SiMe3)2，O(I)Pr，BH4)，并用元素分析、核磁共振和循环伏安等方法对其进行了表征。其结构经单晶X-射线衍射法确证。这些配合物是RAC-丙交酯(RAC-LA)开环聚合的高活性引发剂。活性依赖于引发基团，顺序为≈>；通过可逆地改变铁中心的氧化状态，用外部氧化还原试剂原位控制聚合的活性和聚合过程。
Lanthanum complexes [(L)LaX] (X = N(SiMe3)2, O(i)Pr , BH4) supported by a ferrocene-based (OSSO)-type ligand LH2 were synthesized and characterized by elemental analysis, NMR spectroscopy and cyclic voltammetry. The structure of was confirmed by single crystal X-ray diffraction. These complexes were highly active initiators for the ring-opening polymerization of rac-lactide (rac-LA). The activity depended on the initiating group in the order of ≈ > . The activities of and during polymerization were controlled in situ with external redox reagents by reversibly switching the oxidation state of the iron center.