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. 2014 Oct 21;53(21):11367–11376. doi: 10.1021/ic500926c

Table 2. Acidity Constants (pKa Values) of L1 and L2 Determined by Spectrophotometric Titrations (Errors Are for the Last Digit)a.

reaction L1 L2
[H3L]2+ = [H2L]+ + H+ (pKa1) 3.556(2)  
[H2L]+ = [HL] + H+ (pKa2) 8.427(3) 3.154(2)
[HL] = [L]− + H+ (pKa3) 10.108(2) 9.360(1)
a

[HL] represents the neutral form of L1 and L2.