Mimicking Electron Transfer Reactions in Photosystem II: Synthesis and Photochemical Characterization of a Ruthenium(II) Tris(bipyridyl) Complex with a Covalently Linked Tyrosine

摘要

In the natural photosynthetic reaction center photosystem II, absorption of a photon leads to photooxidation of the primary electron donor P_680, which subsequently retrieves electrons from a tyrosyl residue, functioning as an interface to the oxygen-evolving manganeses complex. In a first step toward mimicking these reactions, we have made a Ru(II)- polypyridine complex with an attached tyrosyl moiety. The photoexcited ruthenium complex played the role of P_680 and was first oxidized by external acceptors.