Abstract
The authors report the behavior of several organophilic macrocyclic polyethers (crown ethers) as coordinative extraction synergists in combination with 1) a long-chain neo carboxylic acid, 2) an alkyl phosphoric acid, and 3) an alkyl-aryl sulfonic acid. Selected combinations of these organophilic cation exchangers and macrocyclic coordinators were examined as extractants for alkali, alkaline earth, and first-row transition elements from nitrate systems. Both synergistic and antagonistic effects were produced. Macrocycles having a cavity size to fit the metal ion usually produced the largest synergistic effect; however, the nature of the substituents on the macrocyclic ring also has a strong effect on selectivity. In general, alkali metal ions prefer to bond to benzo-substituted crown ethers while alkaline earth ions prefer to bond to cyclohexano-substituted ones. Iron, cobalt, and nickel extractions are antagonized by the macrocycles while copper is synergized only slightly and manganese and zinc moderately strongly.
| Original language | English |
|---|---|
| Pages | 477-482 |
| Number of pages | 6 |
| State | Published - 1986 |