Ruthenium complexes containing pyridine-2-carbaldehyde azine as a synthon in the synthesis of bi-/trimetallic complexes

Abstract

Ruthenium complexes [(η5-C5H5) Ru(PPh3)(κ2-paa)]PF6 (paa = pyridine-2-carbaldehyde azine) and [(η5-C5H 5)Ru(κ1-dppm)-(κ2-paa)]BF 4 [dppm = bis(diphenylphosphanyl)methane] have been employed as a synthon in the synthesis of homo/hetero bi-/trimetallic complexes. It is the uncoordinated N,N-donor site on paa in complex [(η5-C 5H5)Ru(PPh3)-(κ2-paa)]PF 6, and N,N-donor site on paa and pendant phosphorus in [(η5-C5H5)Ru(κ1-dppm) (κ2-paa)]BF4 that allows for their incorporation into bi-/trimetallic systems. The resulting complexes have been characterized by analytical, spectral and electrochemical studies. Molecular structures of homobimetallic complex [(PPh3)(θ5-C 5H5)Ru(μ-paa)Ru(θ6-C 10H14)Cl](PF6)2 and hetero-bimetallic complex [(PPh3)(θ5-C 5H5)-Ru(μ-paa)Rh(θ5-C 5Me5)Cl](PF6)2 have been authenticated crystallographically. Complexes exhibit absorptions throughout the visible region and complicated electrochemical behaviour. Metal-based Ru II/RuIII oxidations in the bimetallic complexes do not vary as in the trimetallic complexes. © Wiley-VCH Verlag GmbH & Co. KGaA, 2008.