In present study, new CO2-soluble aza-18-crown-6-ether derivatives have been designed and synthesized from N-(4-formylphenyl)aza-18-crown-6-ether by simple chemical modifications for the CO2-philic chelating agent.
Their solubilities and metal ion extraction ability in supercritical carbon dioxide (sc CO2) have been tested and the relationship between structure and CO2-solubility has been proposed.

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