Abstract
The separation of halide ions by chromatography on silica gel coated with water-insoluble crown ether dyes was investigated. The retention times of fluoride and hydrogencarbonate ions were longer than those of chloride, bromide and iodide ions when distilled water was used as a mobile phase. The order was different from that of traditional anion-exchange selectivity. The elution behaviour is compared with that on silica gel and octadecylsilica gel, and is discussed with regard to the hydrophobicity and the hydrogen-bonding interaction.
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