Correlation Between the Lever Parameter and Electronic Properties of Nitrosyl Ruthenium(II) Complexes

Abstract

The Lever parameter (E_L), for a series of ruthenium nitrosyl complexes of the type [Ru(NH₃)₄NOL] ⁿ⁺, where ligand L = nicotinamide (nic), isonicotinamide (isn), pyrazine (pz), pyridine (py), imidazole (imN), L-histidine (L-hist), NH₃, trimethyl phosphite [P(OMe)₃] and triethyl phosphite [P(OEt)₃], is correlated to E_pc1 (the potential for the reduction RuNO⁺+e^- → RuNO ⁰) and v(NO) data. A correlation is observed between ∑E_L and E_pc1, and between ∑E_L and v(NO), since these parameters are dependent on electronic characteristics of the nitrosyl group. For ∑E_L v. E_pc1, the slope, S_L, and intercept, I_L, of the linear correlation are related to interligand coupling through the metal centre and to the extent of the Ru → NO back bonding.