Preparation of the Optical Forms of Tris-Acetylacetone Cobalt III

Abstract

IN an earlier communication¹, a number of experiments were described leading to the conclusion that the activities of enantiomeric ions could be changed to a different extent by the addition of an electrolyte containing an optically active anion or cation. In order to demonstrate the general applicability of this principle, we have sought to resolve a typical non-electrolytic complex salt without salt-forming groups. The peripheral atoms in the tris-acetylacetone cobalt III complex probably carry a slight negative charge, and hence negative or anionic asymmetrical fields are associated with the antipodal forms. The maximum differential interaction in solution is to be expected with a multiply-charged optically active cation, and for the purpose d- and l-tris-ethylene-diamine cobalt III iodides were used.