Reactions of complex compounds of cobalt. Part VIII. Synthesis, protonation, and oxidative degradation of salicylatocobalt(III) complexes

Abstract

A new synthesis of bis(ethylenediamine)salicylatocobalt(III) ion has been developed and extended to analogous complexes with the ligands 3-methylsalicylic, 5-methylsalicylic, and 3-hydroxy-2-naphthoic acid. Salicylato- and 5-methylsalicylato-(triethylenetetramine)cobalt(III) salts have also been prepared. ¹H N.m.r. and electronic spectroscopy have been used to study protonation of several of these complexes and the results suggest that the site of attachment is the oxygen atom of the phenol group. All the complexes can be oxidatively degraded with acidic potassium permanganate to give corresponding oxalato-derivatives.