When the initial concentration of hydrogen donor: RsvH3 ([RsvH3]) is much higher than that of O2 ([O2]), the formation constants, K for the m : n (m, n = 1,2,3…) complex of mO2-nRsvH3 and K -for that of mO2 •--nRsvH3, in the equilibrium system of the redox reaction shown in Scheme 1 have been defined by Equations ( ) and (8). The concentrations of electrogenerated O2 •-and the formed complexes are [O2 •-], [mO2-nRsvH3], and [mO2 •--nRsvH3], respectively. Actually, the concentrations (mol dm -3 ) of RsvH3 (1.0 to 5.0) and O2 (4.8) are about the same, however, an HB effect due to the high bond valence derives from the three OHs per RsvH3 molecule (4'OH, 3OH, and 5OH) is expected to form an extensive HB network in a DMF solution.