Nickel(II) bis(diphenylphosphino)amide: Redox-coupling of dppa ligands in coordination sphere of Ni2+ and some other properties

Interaction of nickel(II) bis(diphenylphosphino)diphenylamide {Ni(dppa)2} with carbon monoxide leads to the redox coupling of dppa ligands and formation of zero-valent nickel complex (CO)2Ni(Ph2PNPPh2PPh2NPPh2). Similar reaction with sulphur dioxide yields simple adduct (SO2)NiII[(PPh2)2N]2, while allyl bromide alkylate dppa ligand to form All-N(PPh2)2NiBr2. The electrochemical reduction of Ni(dppa)2 in CH2Cl2 takes place in two steps: reversible one-electron and quasi-reversible three-electron step.