摘要
A square planar rhodium complex from the copolymer of 2\|pyridyl ethylene and other low\|molecular\|weight rhodium complexes with similar structure are reported. The experimental results of XPS and IR spectroscopy indicated that the weak N→Rh coordination bond can easily replace the strong Rh\|C back donation bond with the elevation of temperature due to the steric effect. The terminal carbonyl group in the complex will be substituted to form tridentate and then tetradentate complexes. This is a reversible process. When they are in the atmosphere of CO, tridentate and bidentate complexes will form. These experimental results provide the theoretical reason why the catalytic activities from the polymer coordinated rhodium complex is superior to that of other rhodium complexes.
A square planar rhodium complex from the copolymer of 2-pyridyl ethylene and other low-molecular-weight rhodium complexes with similar structure are reported. The experimental results of XPS and IR spectroscopy indicated that the weak N→Rh coordination bond can easily replace the strong Rh-C back donation bond with the elevation of temperature due to the steric effect. The terminal carbonyl group in the complex will be substituted to form tridentate and then tetradentate complexes. This is a reversible process. When they are in the atmosphere of CO, tridentate and bidentate complexes will form. These experimental results provide the theoretical reason why the catalytic activities from the polymer coordinated rhodium complex is superior to that of other rhodium complexes.
基金
ProjectsupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .2 95 74 188)
