New potassium- and cesium-selective ionophoric bis(crown ether)s derived from xanthene-4,5-dicarboxylic acid
- Authors
- Cho, YH; Rha, SG; Chang, Suk-Kyu; Chung, TD; Cho, KC; Kim, H
- Issue Date
- Jun-1998
- Publisher
- KLUWER ACADEMIC PUBL
- Keywords
- potassium-selective ionophore; bis(crown ether); ion selective electrode; solvent extraction
- Citation
- JOURNAL OF INCLUSION PHENOMENA AND MOLECULAR RECOGNITION IN CHEMISTRY, v.31, no.2, pp 119 - 129
- Pages
- 11
- Journal Title
- JOURNAL OF INCLUSION PHENOMENA AND MOLECULAR RECOGNITION IN CHEMISTRY
- Volume
- 31
- Number
- 2
- Start Page
- 119
- End Page
- 129
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/43650
- DOI
- 10.1023/A:1007988801269
- ISSN
- 0923-0750
1573-1111
- Abstract
- A series of bis(crown ether)s based-upon a xanthene-4,5-dicarboxylic acid skeleton was prepared and their ionophoric properties toward alkali metal cations were investigated. Bis(crown ether)s bearing 15-crown-5 and 18-crown-6 moieties exhibited pronounced extraction efficiencies toward K+ and Cs+ ions, respectively, and the extraction constant estimated by solvent extraction studies was as high as 10(9) for the 2-K+ and 3-Cs+ systems. Using UV titration of potassium picrate with 2 in THF, the complex was found to have a structure of a completely encapsulated guest in the host. In transport experiments, the bis(crown ether)s showed no significant selectivity pattern compared with extraction results, again implying the strong complexation of bis(crown ether)s. Ion-selective electrode studies also demonstrated that the selective ionophoric properties of 2 toward K+ were reminiscent of the natural antibiotic valinomycin except for a somewhat slow response.
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