Reaction of Adenine and Guanine with [Ru(RaaiR )2(EtOH)2](ClO4)2·Spectral and Electrochemical Characterization of the Products [RaaiR′ = 1-Alkyl-2-(arylazo)-Imidazole

Abstract

[Ru(RaaiR′)2(EtOH)2](ClO4)2[RaaiR′= 1-alkyl-2-(arylazo)imidazole, p-R-C6H4-N = N-C3H2N-N(1)-R′, R = H (a), Me (b), Cl (c), R′= Me (1, 3), Et (2, 4)] reacts with nucleobases [NB – adenine (A), guanine (G)] in aqueous EtOH to give red–violet mixed ligand complexes of the type [Ru(RaaiR′)2(NB)(H2O)](ClO4)2. The solution electronic spectra exhibit a strong MLCT band at 540–560 nm in MeCN. The cyclic voltammogram shows a RuIII/RuII couple at 1.3–1.4 V versus Ag/AgCl along with three successive ligand reductions.