研究室工作进展 Feb. 14th, 2019

As usual, ligands play a very important role for the structure and reaction of organomanganese compounds, which are often stabilized by a variety of ligands, such as cyclopentadienyl and phosphines. The cyclopentadienyl-phosphine ligand, in which a multi-substituted cyclopentadienyl moiety and a phosphine moiety is linked by an alkyl or aryl group, is a potential chelating ligand. Its cooperative coordination mode with transition metals forming so-called constrained geometry complexes (CGC) may result in resonance interactions between the lone pair on the phosphorus center and the cyclopentadienyl π system.

We have developed a convenient method for the synthesis of multi-functional -phosphine ligands. As our continued interest in their application as a chelating and stabilizing ligand for novel transition-metal complexes, we have now investigated their coordination behaviour with manganese. Herein, we report the synthesis and structural characterization of a series of well-defined manganese(II) complexes supported by cyclopentadienyl-phosphine ligand. Results demonstrated that the chelating and stabilizing effects of cyclopentadienyl-phosphine ligand enabled different structures and reactivities of manganese(II) complexes.