Synthesis of enantiopure planar-chiral cyclopentadienyl-ruthenium binuclear complexes bridged by aromatic systems

Abstract

Planar-chiral trisubstituted cyclopentadienyl-ruthenium binuclear complexes [(Cp³Ru)₂(μ-η⁶,η⁶-arene)][PF₆]₂ (Cp³ = (R_C1)- or (S_C1)-1-PrⁱNHCO-2,4-Me₂C₅H₂) bridged by aromatic π-ligands such as biphenyl b, triphenylene c, diphenylmethane d, and 9,10-dihydroanthracene e were synthesized and isolated in an enantiomerically pure form. The molecular structures of (S_C1)-[Cp³Ru(η⁶-biphenyl)][PF₆] (S)-1b(Cp³), [{(S_C1)-Cp³Ru}₂(η⁶,η⁶-biphenyl)][PF₆]₂ (R,R)-3b(Cp³), and [Cp³Ru(η⁶-triphenylene)][PF₆] 1c(Cp³) were established by X-ray crystallography. These complexes were characterized by optical and electrochemical analyses.