Abstract
The chelation of Cu2+ cation by salicylic acid, sodium salicylate, m- and p-hydroxybenzoic acids, and a macrocyclic receptor, such as 18-crown-6-ether, have been studied by means of pH and emf measurements with a Cu2+/Cu ion-selective electrode (ISE). The latest permit the determination of thermodynamic stability constants based on activity quotients, which is unusual in potentiometric studies. An experimental procedure has been set up to measure simultaneously both properties by using the combined glass electrode as the reference electrode of the ISE, with clear advantages with respect to the conventional double-junction electrodes with sleeve diaphragms. The studies have been carried out at 25°C as a function of ligand concentration at constant [Cu2+], and as a function of [Cu2+] at constant ligand concentration. Several models have been proposed to determine the stability constants of the chelates, proving different stoichiometries.
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Junquera, E., Pasero, A. & Aicart, E. Electrochemical Study of the Chelation of Cu2+ Cation by 18-Crown-6-Ether and Hydroxybenzoic Acids in Aqueous Solution. Journal of Solution Chemistry 30, 497–508 (2001). https://doi.org/10.1023/A:1010355117672
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DOI: https://doi.org/10.1023/A:1010355117672