Effects of quaternary ammonium bases on valence-saturated but coordination-unsaturated chelates : Part I. Extraction of chelates of glyoxal bis-(2-hydroxyanil) and o-(salicylideneamino) phenol

Abstract

The effects of tetradecyldimethylbenzylammonium chloride (zephiramine), a quaternary ammonium base, on chelate formation and extraction of metals were studied. By the action of zephiramine, the non-extractable 1:1 calcium- or cadmium—glyoxal bis-(2-hydroxyanil) chelate changes to an extractable uncharged chelate, Ca(A)(H 2A) or Cd(A)(H 2A), by replacing water molecules with GHA molecules (H 2A). This is a new type of synergism. In the presence of zephiramine, the non-extractable 1:1 zinc or nickel- o-(salicylideneamino) phenol chelate also changes to a negatively charged Zn(L) 2 2- or Ni(L) 2 2- chelate which can be extracted by coupling with two molecules of zephiramine.