Rare-earth complexes supported by an ansa-bis(amidinate) ligand with a rigid o-phenylene linker: synthesis, structure, and catalytic activity for polymerization of cyclic esters
Rare-earth complexes supported by an ansa-bis(amidinate) ligand with a rigid o-phenylene linker: synthesis, structure, and catalytic activity for polymerization of cyclic esters
复制标题
由带有刚性邻亚苯基连接基的 ansa-双（脒基）配体支持的稀土配合物：环酯聚合的合成、结构和催化活性
DOI：
10.1039/c9dt00365g
复制
发表时间：
2019
影响因子：
4
通讯作者：
Shaowu Wang
中科院分区：
文献类型：
--
作者：
Fenhua Wang;Xu Zhao;Xianfu Meng;Shaowu Wang
A bis(amidinate) ligand with a rigid o-phenylene linker C6H4-1,2-[NC(tBu)NH(C6H5)]2 (1) was successfully employed for the syntheses of rare-earth amides 2–5 in good yields. The structures of the amides were established by X-ray diffraction analysis and revealed that the ligand framework coordinated to the lanthanide atoms in different fashions depending on the central ion size. Larger lanthanide metal ions La3+ and Nd3+ prefer to form dinuclear complexes with one linked bis(amidinate) ligand as a bridge, while the smaller sized Y3+ and Er3+ favor the formation of mononuclear complexes. These complexes exhibited good catalytic activity for ring-opening polymerization of ε-caprolactone and L-lactide and the mononuclear complexes display higher activity.
