Investigation of the Electron Transfer between Levodopa and Zinc Porphyrins at Bionic Interface

Abstract

In this paper, the interface between two immiscible electrolyte solutions (ITIES) is adopted as the bionic interface model to investigate the interfacial electron transfer (ET) process of levodopa by using thin-layer cyclic voltammetry. Three zinc porphyrins with a systematic variation in structure are used as the reactants in the organic phase for the supply of varied overall driving forces at the ITIES. The consecutive two-step ET reactions between levodopa and three zinc porphyrins with the corresponding ET rate constants are evaluated precisely. The relationship between the interfacial ET rate constants and the overall driving force are also studied. It is found that the ET kinetics of the bimolecular reactions at the ITIES obeys the Marcus theory in a wide potential region. The results of this work will assist in our understanding of the interfacial electron-transfer process of levodopa in vivo.

Syntheses, crystal structures, photo-physical properties, antioxidant and antifungal activities of Mg(II) 4,4′-bipyridine and Mg(II) pyrazine complexes of the 5,10,15,20 tetrakis(4–bromophenyl)porphyrin

“…Having conjugated configuration, porphyrins and metalloporphyrins are remarkable precursors in supramolecular chemistry [15,16] and are considered as excellent components in the design of functional molecular materials with improved electrochemical and physical-chemical properties [16]. Several projects were reported, including molecular wires [17], chemical sensors [18], semi-conductors [19], photo-induced electron transfer [20,21], and solar photovoltaic cells [22,23]. Notably several derivatives based on porphyrin had been developed as efficient photosensitizers for photodynamic therapy (PDT) in clinical applications [24,25].…”