Synthesis and binding character of ether-ester-ethyleneurea podands and macrocycles-synthetic nactin analogs
摘要:
The ether-ester macrocycles and podands containing one or two ethyleneurea oxygen(s) as ligating site(s), selectively bind Sr2+ picrate over Li+, Na+, K+, Tl+, Mg2+ and Ca2+ picrates. The sixteen membered macrocycle (4a)- half the size of nactin, shows maximum selectivity towards Sr2+.