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

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Abstract
The Lever parameter (EL), 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 Epc1 (the potential for the reduction RuNO++e- → RuNO 0) and v(NO) data. A correlation is observed between ∑EL and Epc1, and between ∑EL and v(NO), since these parameters are dependent on electronic characteristics of the nitrosyl group. For ∑EL v. Epc1, the slope, SL, and intercept, IL, of the linear correlation are related to interligand coupling through the metal centre and to the extent of the Ru → NO back bonding.

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