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.
Highlights
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
TFAF has increased solubility in water 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
Summary
2,5 мл 1 · 10−2 моль/л производного ТФАФ+1 мл 1 моль/л NaOH +21,5 мл Н2О 2,5 мл 1 · 10−2 моль/л производного ТФАФ +2,5 мл 1 моль/л NaOH+20 мл Н2О 2,5 мл 1 · 10−2 моль/л производного ТФАФ + 22,5 мл 1 моль/л NaOH. Изучение гидратации ГЭ п-ТФАБК, ТФАФ, п-МТФАФ, 2,4-ДМТФАФ, 2,4,6-ТМТФАФ методом УФ-спектрофотометрии. 1), полученных после экстракции ТФАФ из его гексанового раствора. В нейтральной и кислой средах гидратация ТФАФ не наблюдается За время экстракции (30 мин) не было обнаружено гидратной (диольной) формы, однако при длительном ных после экстракции ТФАФ из его гексанового раствора 2. УФ-спектры водных фаз, полученных после экстракции ТФАФ из его гексанового раствора Коэффициент распределения для ГЭ п-ТФАБК, несмотря на наличие в нем цепочки С7, сопоставим с таковыми для п-МТФАФ и ДМТФАФ, что, видимо, обусловлено присутствием гидрофильной карбонильной группы, которая плохо экстрагируется гексаном. Влияние природы производных ТФАФ на селективность карбонат- и сульфатселективных электродов.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
