Metal-metal communication between 1,1′- bis(diphenylphosphino)cobattocenium and an organonickel moiety

1,1'-Bis(diphenylphosphino)cobaltocenium (dppc)(+), similar to 1,1'-bis(diphenylphosphino)ferrocene, can be coordinated by dicarbonylnickel(0) or cyclopentadienylnickel(II), respectively. The cyclic voltammogram of INi(CO)(2)(dppc)](+) ([1](+)) showed two reversible reductions, at potentails nearly identical to (dppc)(+). The ligand-based reductions were confirmed by IR spectroelectrochemistry (SEC), although the Delta nu(CO) was larger than might be expected if the ligand was electronically decoupled to the Ni(CO)(2) moiety. The larger Delta nu(CO) was attibuted to changes in the donor/accpetor properties of the -PPh2 moeities based on the occupation of the Co-Cp anti-bonding orbital, where the Cp ligand adopts an ylide-like structure. A similar analysis was performed on [CpNi(dppc)](2+) ([2](2+)), where the two reductions were anodically shifted by Delta E = 292 and 520 mV from (dppc)(+), indicating an increase in the M- M communication. The EPR SEC spectrum for [2](+ )showed that the cobalt was reduced, while the UV-Vis-NIR SEC spectrum for [2](+) showed a MR absportion at 1200 nm assinged as a MMCT Co-II -> Ni-II band. The second reduction formed 121 degrees which was EPR silent but the UV-Vis-NIR SEC spectrum showed an increase in the intensity of the MMCT Co-I -> Ni-II.

Automated summary

The coordination reaction of 1,1'-bis(diphenylphosphino)cobaltocenium (dppc)(+) with dicarbonylnickel(0) or cyclopentadienylnickel(II) was studied using experimental and spectroscopic analysis. The results confirmed the ligand-based reductions and revealed the interaction between the ligand and metal through electrochemistry and spectroscopy.