Electrochemical Behavior of Quinoxalin-2-one Derivatives at Mercury Electrodes and Its Analytical Use

Table 3

Values of product αz and number of protons 𝑝 calculated from DC curves for compounds I, II, and III.

Compound	pH	αz	αz	Mean value		p	Slope calculated [V/pH]	Slope read off from the graph [V/pH]
		(a)	(b)	αz	α
I	<2.7	0.365	0.373	0.369	0.185	0.532	−0.088	−0.088
	2.7–7.6	0.451	0.482	0.467	0.223	0.553	−0.070	−0.070
	7.6–9.9	1.221	1.296	1.259	0.629	0.797	−0.038	−0.039
	>9.9	0.720	0.720	0.720	0.360	0.955	−0.079	−0.078
II	<2.0	0.329	0.281	0.305	0.153	0.398	−0.077	−0.077
	2.0–8.0	0.335	0.313	0.324	0.162	0.408	−0.074	−0.073
	8.0–9.8	0.739	0.810	0.774	0.387	0.595	−0.037	−0.036
	>9.8	1.136	1.118	1.127	0.564	1.166	−0.063	−0.063
III	<1.9	0.368	0.397	0.382	0.191	0.583	−0.091	−0.086
	1.9–5.2	0.755	0.664	0.698	0.349	0.689	−0.058	−0.062
	5.2–8.5	1.539	1.485	1.512	0.756	1.734	−0.068	−0.065
	8.5–10.1	1.385	1.316	1.351	0.676	0.931	−0.041	−0.045
	>10.1	0.649	0.651	0.650	0.325	0.856	−0.061	−0.076