Chemical Analog Optical System 2 To The Body Part Of The Electronic Transfer Process

According to the understanding about the natural photosynthesis, two molecules ruthenium tris-bipyridine covalently linked to histidine and tyrosine derivatives, are designed and will be synthesized to demonstrate the electron transfer between the tyrosine and histidine in further study. Firstly, in order to model the electron transfer steps in Photosystem II (PSEII) in green plants, a ruthenium tris-bipyridyl complex, which mimics the function of P680 in PSII, has been covalently linked to a histidine derivative. This complex 4ais characterized by IR, API-MS, 1H-NMR, Elemental Analysis. It is prepared by 4'-methyl-2,2'- bipyridyl-4-carboxy acid 2 and histidine methyl ester dihydrochloride la. Its electrochemical property is showed by Cyclic voltammetry. By using flash photolysis in the presence of an electron acceptor (methylviologen), it is demonstrated that an electron is transferred from the exicted state of the ruthenium tris-bipyridine moiety to methylviologen, forming a methylviologen radical and a ruthenium(III) tris-bipyridine moiety. The drastical quenching of ruthenium moiety is much faster than the decay of methylviologen. All these show an intramolecular electron transfer from histidine to ruthenium.