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KMID : 1059519880320050443
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Journal of the Korean Chemical Society
1988 Volume.32 No. 5 p.443 ~ p.451
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Studies on Ion-Selective Crown Ether Dyes
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Kang Sam-Woo
Pak Chong-Min
Koo Won-Fae
Kim Keun-Jae
Lee Soo-Min
Chang Choo-Hwan
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Abstract
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New crown ether dye-Ⅰ and dye-Ⅱ having an azo group(-N=N-) were synthesized from monobenzo-15-crown-5 and dibenzo-18-crown-6. These dyes showed λmax of 377 and 383nm respectively. The complexes of alkali metal ions (Na+, K+, Cs+) with dye ligands showed band shift (390~400nm) and intensity increased. For a given anion, the extraction constants are in the order of K+ < Cs+ < Na+ for dye-Ⅰ and Cs+ < Na+ < K+ for dye-Ⅱ. These results show that the selectivity of crown ethers toward the alkali metal ions is dependant on the charge density of cation and the size of crown ether cavity. For a given cation, the order of the extraction constant is Cl- < Br- < I- < picrate. This order coincides with the degree of anion solvation effect.
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