Palladium(II) and platinum(II) metal centers have been used to demonstrate that easily prepared p-hydroquinonyl dimethyl ether-substituted phosphines are readily modified when coordinated to give complexes with redox-active p-hydroquinonylphosphine and p-quinonylphosphine ligands in high yield. These complexes support multiple electron and proton transfer reactions such as those shown. The X-ray crystal structure of one p-quinonylphosphine complex, trans-PdBr2(ppq)(2).(CH3)(2)CO, is described.