Synthesis of rhodium–carbonyl complexes bearing a novel P,N-chelating ligand of Schiff-base type

Schiff-base type N,P-chelating ligands, phosphorus analogues of imino–anilido ligands, were designed and synthesized as a new type of ligands toward transition metals, and the rhodium–carbonyl complexes bearing the novel imino–phosphido and phosphaalkenyl-anilido ligands were synthesized as stable crystalline compounds. Their structures were definitively revealed by X-ray crystallographic analysis, showing the unique electronic features of the ligands. In addition, the effective trans-influence of the phosphorus atom was suggested on the basis of the structural parameters and spectroscopic features of the isolated complexes.

Graphical abstractSchiff-base type N,P-chelating ligands, i.e., phosphorus analogues of imino–anilido ligands, were designed and synthesized as a new type of ligands toward a transition metal. Complexation reactions of the novel imino–phosphido and phosphaalkenyl-anilido ligands with [RhCl(CO)2]2 resulted in the formation of the corresponding rhodium–carbonyl complexes as stable crystalline compounds, the unique structural and electronic features of which were revealed based on their spectroscopic and X-ray crystallographic analyses.Figure optionsDownload full-size imageDownload as PowerPoint slide