The extraction and transport of metal ions by 6,6′-diamino-2,2′-bipyridine derivatives

Abstract

6,6′-Disubstituted-2,2′-bipyridines were studied as to their ability to extract and transport transition- and heavy-metal ions. 6-Amino-6′-dodecyiamino-2,2′-bipyridine (3) has been found to be an excellent synthetic carrier for the specific transport of Cu^II and Cd^II ions through a liquid membrane. The effective transport of Cd^II ion by (3), in spite of its less effective extraction into the organic phase than Cu^II or Zn^II ion, is notable. Moreover, (3) has been shown to have the ability to undergo up-hill transport of both Cu^II or Cd^II ions when the proton gradient is available.