Abstract
The acid dissociation constants (Ka) of 4-(2‘-benzimidazolyl)-3-thiabutanoic acid and related substances were determined by potentiometric titration in 0.1 mol dm-3 (CH3)4NCl at 25 °C. pKa values found were 3.33, 5.46, and 11.32. Stability constants were found for ML2, MHL2, MH3L2, MH4L2, MH-1L2, MH-2L2 complexes for copper, nickel, and zinc.
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