이온성 크라운에테르 포스포닉산에 의한 알칼리 금속 양이온과 알칼리 토금속 양이온의 용매추출

• 영문명: Solvent Extractions of Alkali Metal Cations and Alkaline Earth Cations by Ionizable Crown Ether Phosphonic Acids
• 발행기관: 한국응용과학기술학회 (구.한국유화학회)
• 저자명: 정연진(Chung YeongJin)
• 간행물 정보: 『한국응용과학기술학회지』한국유화학회지 제22권 제1호, 50~55쪽, 전체 6쪽
• 주제분류: 공학 > 화학공학
• 파일형태: PDF
• 발행일자: 2005.03.31

영문 초록

A comparison of alkali metal cation and alkaline earth cation solvent extraction was made for three additional monoionizable crown ethers and one diionizable crown ether. sym-(n-Octyldibenzo)-16-crown-5-oxyacetic acid underline{1} exhibited high efficiency and selecvity in solvent extraction of alkali metal cations with respect to that observed with alkaline earth cations. Sizes of Na^+ and Ca^{2+} appropriately match with the cavity size of monoethyl sym-bis[4(5)-tert-butylbenzo]-16-crown-5-oxymethylphosphonic acid underline{3}. As the result, Na^+ and Ca^{2+} are the best extracted. sym-(n-Octyldibenzo)-16-crown-5-oxymethyldiphosphonic acid underline{4}was found to be somewhat selective for Na^+ over Li^+ and other alkaline earth metal cations. In the complexation of alklaine earth cations by crown ether diphosphonic acid underline{4}, Ca^{2+} and Sr^{2+} are the appropriate sizes, but lager Ba^{2+} may be due to favorable formation of a sandwich type complex between the crown ether cavity and the dianion of the deprotonated crown ether phoaphonic acid moiety.

키워드

solvent extraction alkali metal cation alkaline earth cation crown ether carboxylic acid crown ether phosphonic acid