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Ionophoric biscalix [4]arenyl nitriles in which the lower rims are linked via a single site on each calixarene were synthesized. Their complexing abilities were studied by the liquid-liquid extraction of alkali (Li ϩ , Na ϩ , K ϩ , and Cs ϩ ) and selected transition metal (Cu 2ϩ , Co 2ϩ , Cd 2ϩ , Ni 2ϩ , and Hg 2ϩ ) cations. We found a novel selectivity of these compounds toward Hg ϩ2 cations through examination of the extraction.

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