HEXAFLUOROACETYLACETONATOBIS(ETHYLENEDIAMINE)COBALT(III) PERCHLORATE, REVERSIBLE CHANGES OF ITS ABSORPTION AND ROTATION WITH ACID AND BASE

Hexafluoroacetylacetonatobis(ethylenediamine)cobalt(III) perchlorate, [Co(hfac)(en)2] (ClO4)2 has been prepared and resolved. It has been found that reversible changes in absorption and rotation occur with the variation of the pH of the solution. It has been considered from the facts that the deprotonation of the methylidyne group in hfac may be accompanied with a variation in the electronic state and the steric distribution of the electron density in the chelate ring.