Journal of Chemical and Engineering Data, Vol.50, No.4, 1425-1429, 2005
Determination of acid dissociation constants of 4-(2'-benzimidazolyl)-3-thiabutanoic acid and related compounds and stability constants of their divalent metal complexes with copper, nickel, and
The acid dissociation constants (K-a) of 4-(2'-benzimidazolyl)-3-thiabutanoic acid and related substances were determined by potentiometric titration in 0.1 mol dm(-3) (CH3)(4)NCl at 25 degrees C. pK(a) 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.