Proton-Coupled Electron Transfer in the Oxidation of Guanosine Monophosphate by Ru(bpy)3 3+
Year: 2025
Type: article
Abstract: Oxidation of guanine by the outer-sphere metal complex oxidant Ru(bpy)3 3+ (bpy is 2,2′-bipyridine) has been explored in deoxyguanosine-5′-monophosphate with the added buffers succinic acid/succinate Hsuc/suc–• (pK a = 5.6), H2PO4 –/HPO4 2– (pK a = 7.2), and Tris [(HOCH2)3CNH3 +/(HOCH2)3CNH2] (pK a = 8.1) at 23 ± 2 °C. Over an extended range of buffer concentrations and ratios, there is clear evidence for the mechanistic importance of pathways involving concerted electron–proton transfer. In this pathway, proton transfer to the base form of the buffer occurs in concert with electron transfer to the oxidant, Ru(bpy)3 3+.
DOI: 10.17615/fwrn-9t31
Authors: Thorp, H. Holden, Dongare, Prateek, Meyer, Thomas J., Gagliardi, Christopher J., Murphy, Christine Fecenko, Weatherly, Stephanie C.
Institution: University of North Carolina at Chapel Hill
Language: English
Subfield: Physical and Theoretical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3006436878