크라운에테르 포스포닉산 모노에틸 에스테르에 의한알칼리 토금속 양이온의 경쟁 용매추출

초록

Competitive solvent extraction of alkaline earth metal cations from water into organic solvent containing the carboxylic acid crown ether and analogous crown ether phosphonic acid monoethyl esters were investigated. sym-(n-Decyldibenzo)-16-crown-5- xyacetic acid 1 and monoethyl sym-(n-decyldibenzo)-16-crown-5-oxymethylphosphonic acid 3 are structurally identical except for the ionizable groups. Both of them provide similar extraction behavior in terms of efficiency and selectivity, but monoethyl sym-(n-decyldibenzo)-16-crown-5-oxymethylphosphonic acid 3 showed higher alkaline earth metals loadings at acidic or neutral media. Monoethylsym-(n-octyldibenzo)-16- rown-5-oxymethylphosphonic acid 2 showed better selectivity and alkaline earth metals loading than did the analogous sym-(n-octyldibenzo)-16-crown-5-oxymethyldiphosphonic acid 6.

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