A new Hg2+-selective chromoionophore based on calix[4]arenediazacrown etherDedicated to Professor Iwhan Cho on the occasion of his 65th birthday.
Abstract
A new azophenol type chromogenic ionophore based on the p-tert-butylcalix[4]arenediazacrown ether was prepared: the ionophore exhibited a pronouncedly selective chromogenic behaviour toward Hg2+ ions among the surveyed guests of alkali, alkaline earth, transition and heavy metal ions in liquid–liquid extraction experiments.