1. Synthesis, Structure, and Reactivity of Homodinuclear Lanthanide Complexes Bearing Salen-type Schiff-base Ligand
- Author
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Yaorong Wang, Wenfeng Lv, Bing Wu, Qi Shen, and Yingming Yao
- Subjects
Inorganic Chemistry ,Lanthanide ,chemistry.chemical_compound ,Crystallography ,Schiff base ,Ionic radius ,Octahedron ,chemistry ,Ligand ,Stereochemistry ,Metal ions in aqueous solution ,Reactivity (chemistry) ,Crystal structure - Abstract
Three homodinuclear lanthanide complexes [Ln2(μ-L)3] [Ln = La (1), Nd (2), Sm (3)] were synthesized by the reaction of Ln[N(SiMe3)2]3 (Ln = La, Nd, Sm) with 1.5 equiv. of the salen-type ligand N,N-bis(3, 5-di-tert-butyl-salicylidene)-1, 3-diaminobenzene (H2L) in THF at room temperature. X-ray diffraction studies revealed that the coordination arrangement around each lanthanide atom could be best described as distorted octahedral for complexes 2 and 3 and the two lanthanide metal ions are linked together by the three rigid m-phenylenediamine-based ligands. The ring-opening polymerization (ROP) of ϵ-caprolactone (ϵ-CL) was carried out using the complexes 1–3 as catalysts. The catalytic activities of dinuclear lanthanide complexes were greatly affected by ionic radii and the increased active order is Sm < Nd < La.
- Published
- 2012