Complexation in Benzo-15-Crown-5–Chloroform–Substituted Acetic Acid Extraction Systemsстатья
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Дата последнего поиска статьи во внешних источниках: 25 января 2019 г.
Аннотация:Complexation processes in extraction systems have been studied using the extraction of acetic, propionic (methylacetic), monochloroacetic, dichloroacetic, and trichloroacetic acids with benzo-15-crown-5 as an extractant. The isotherms for the extraction of acids with the pure solvent and 1 M benzo-15-crown-5 in chloroform are determined. The dependences of the distribution ratioratios of the considered acids on the extractant concentration in the organic phase are presented. Based on the experimental data and the “blank” extraction isotherm equations, the acid : benzo-15-crown-5 ratio in the complexes formed in the extract have been calculated minus the contribution of extraction with the pure solvent. No complexation of methylacetic acid with benzo-15-crown-5 occurs, and the strength of the complexes of chloro-substituted acetic acids rises in the order acetic acid < monochloroacetic acid < dichloroacetic acid < trichloroacetic acid.