Abstract
UV-spectrophotometric and chromatographic studies of the distribution of trifluoroacetophenone (TFAF) and a number of its derivatives (heptyl ether of p-trifluoroacetylbenzoic acid (HE p-TFABA), p-methyltrifluoroacetophenone (p-MTFAF), 2,4-dimethyltrifluoroacetophenone (DMTFAF), 2,4,6-trimethyltrifluoroacetophenone (TMTFAF)) in a hexane-water system, which simplifies the modeling of a polyvinyl chloride membrane carbonate and sulfate-selective electrodes, were performed. These substances are used as neutral carriers (NC) in membranes of ion-selective electrodes, reversible to double-charged inorganic anions. A systematic study of the hydration of TFAF and a number of its derivatives was carried out. TFAF has increased solubility in water (the distribution coefficient D is 415) as compared to p-MTFAF, DMTFAF, TMTFAF and HE p-TFABA (D within 1360–2700), which does not allow to recommend it as an NC for making electrode membranes. The strongest hydration occurs for the HE p-TFABA in the alkaline medium. It has been found that p-MTFAF and HE p-TFABA form crystalline hydrates. The selectivity coefficients of carbonate and sulfate-selective electrodes were determined for all the NC studied and a number of them were made to improve the selectivity of the electrodes: TFAF k p-MTFAF k DMTFAF k TMTFAF k p-BTFAF (p-buthyltrifluoroacetophenone) k HE p-TFABA.
Publisher
Publishing House Belorusskaya Nauka
Subject
Inorganic Chemistry,Organic Chemistry,Chemistry (miscellaneous),Analytical Chemistry
Reference21 articles.
1. Rakhman’ko E. M., Matveichuk Yu. V., Kopyrin A. D., Potapkin N. V. Molybdate-selective electrode based on higher quaternary ammonium salts. Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya khimichnykh navuk = Proceedings of the National Academy of Sciences of Belarus. Chemical Series, 2017, no. 2, pp. 44–50 (in Russian).
2. Matveichuk Yu. V., Rakhman’ko E. M., Okaev E. B. Effect of the Nature of a Quaternary Ammonium Salt and the Addition of a Neutral Carrier on Analytical Characteristics of Sulfate-Selective Electrodes. Journal of Analytical Chemistry, 2018, vol. 73, no 4, pp. 374–382. https://doi.org/10.1134/s1061934818040081
3. Matveichuk Yu., Akayeu Ya., Rakhman’ko E. Hydration of p-trifluoroacetyl benzoic acid heptyl ester: how it affects analytical characteristics of sulphate selective electrodes based on higher quaternary ammonium salts. Chemical Papers, 2018, vol. 72, no 2, pp. 509–514. https://doi.org/10.1007/s11696-017-0294-5
4. Matveichuk Yu. V., Rakhman’ko E. M. Influence of the QAS nature and size of a doubly charged hydrophilic inorganic ions on the analytical characteristics of S4 O6 2−, SO4 2−, SO3 2−, S2−, S2 O3 2− selective electrodes. Analytical Chemistry Letters, 2017, vol. 7, no. 5, pp. 647–654. https://doi.org/10.1080/22297928.2017.1395296
5. Matveichuk Yu., Rakhman’ko E., Akayeu Ya., Stanishevskii D. Ion-selective electrodes based on long-chain quaternary ammonium salts with enhanced steric accessibility, and their application for determination of hydrophilic doublecharged inorganic anion. Chemical Papers, 2018, vol. 72, no 3, pp. 731–739. https://doi.org/10.1007/s11696-017-0320-7