By removing hydrogen atoms, molecules in the form of QH 2 are converted into partially and fully oxidized forms of QH and Q, respectively. Another possibility is that QH 2 initially undergoes an ET or PT reaction, then a PET, such as PET15 and PET37. Whenever these reactions take place, the redox potential in water at pH = 0 equals E 0 . According to our results, the PET reactions mostly take place within the water electrochemical potential window of ca. -1.5 to +1.5 V SHE . Figure (f) illustrates the backbone effects and demonstrates that compounds 1 and 10 are highly driven to lose hydrogen atoms. Compounds 7, 8, and 9 partially and to a lesser extent exhibit the same behavior. Otherwise, the PET reactions are endothermic. We see no outliers in the data, and it is well-prepared for further analysis.