Synthesis and Photochromic Property of cis-Azobenzene Complex with a Binuclear η6-Areneruthenium(II) Unit

Abstract A cis-azobenzene complex with a binuclear ruthenium(II) unit bridged by alkoxo ligands which are tethered to η6-arene donors (4) was synthesized from corresponding binuclear acetonitrile complex (3) and trans-azobenzene irradiated by UV light (300 nm < λ < 400 nm). On irradiation with visible light (λ > 510 nm) in acetonitrile, 4 mostly dissociated to trans-azobenzene and 3 with the photostationary ratio 3/4 = 92/8.