Abstract
The formation of silver(I) complexes with 2-mercaptobenzimidazole (MB) in solutions containing different amounts of ethyl alcohol is studied via potentiometric titration. The acid–base properties of 2‑mercaptobenzimidazole are studied under the same conditions. It is shown that the 2-mercaptobenzimidazole molecule is protonated in the pH range 0.5–2.5. At pH 7–8, an MB molecule is predominantly (99.72%) in the form of a neutral molecule; above pH 11, it exists in the form of a negatively charged ion L−. It is found that two complex forms result from the interaction between Ag(I) and MB. The cumulative stability constants of mono- and bis(ligand) complexes of silver are calculated at different concentrations of ethanol in solution. It is found that increasing the percentage of ethanol in a solution enhances the stability of the complexes of silver(I) and MB.
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