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. 2021 Oct 12;60(21):16213–16222. doi: 10.1021/acs.inorgchem.1c02002

Table 2. Acid Constants in the Form of pKa (at 25 °C in 0.5 M NaCl, with Estimated Standard Deviations in Parentheses) for 1 (HL).

equilibrium pKa
H3L2+ + H2O = H3O+ + H2L+ pKa1 = 1.31(2)
H2L+ + H2O = H3O+ + HL pKa2 = 4.56(2)
HL + H2O = H3O+ + L– pKa3 = 9.25(5)