Rhenium Complexes with N-Heterocyclic Carbene Ligands: Synthesis and Coordination
Date Issued
2011
Date
2011
Author(s)
Chen, Chang-Hong
Abstract
We use the amine-phosphinimine to prepare a series of Re(0) and Re(I) carbene complexes. The crystal structures of these rhenium complexes show the donor ability of carbene in the complexes, and we use IR to evaluate the donor ability of carbenes. The reaction between Re carbene complex and phosphine ligands let us to differentiate the difference between unsubstituted NHCs and phosphines.
Due to the decompose reaction of unsubstituted Re carbene complexes under strong basic condition, we use the reaction between [BrRe(CO)5] and free carbene to synthesis substituted Re(I) carbene complexes. These complexes are studied by X-ray diffraction and IR, we found that the unsubstituted carbene shows poorer donor ability than substituted carbenes. Unsubstituted carbene has similar donor ability to triphenylphosphine.
Substituted rhenium(I) carbene complexes can react with NaBHEt3 to synthesis stable rhenium hydride carbene complexes. The chemical shift in the 1H-NMR spectrum of rhenium hydride carbene complexes can differentiate the donor ability of donor ligands. At last, we synthesis rhenium bipyridine carbene complexes, with using UV-Vis and emission spectrum to analyze the difference in these complexes.
Subjects
N-Heterocyclic Carbe
Rhenium Complexes
Type
thesis
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