A variety of multiarmed macrocyclic polyamines were prepared as a new type of metal carrier, in which amide, ester-, nitrile-, and ketone-functionalized arms were attached as secondary donor sites. Extraction and 13C NMR binding experiments revealed that their cation-binding behavior was largely dependent on the nature of the arm donor group as well as the size of the parent polyamine ring. In particular, introduction of an amide- ...
