Cobal(III) Complexes with 6-nXn> type Ligands. IV. The Preparation and Properties of Tetraammine(salicylideneaminato)cobalt(III) and Diamminebis(salicylideneaminato)cobalt(III) Complexes

Article abstract of DOI:10.1246/bcsj.57.2650

Tetraammine(salicylideneaminato)cobalt(III) complexes, (NH₃)₄>X₂*nH₂O (X: Cl, NO₃, ClO₄, and picrate) and diamminebis(salicylideneaminato)cobalt(III) complexes, ₂(NH₃)₂>X*nH₂O (X: Cl, NO₃, ClO₄, and picrate), have been isolated from a reaction mixture of CoCl₂*6H₂O, 25percent aqueous ammonia, 30percent H₂O₂ and salicylaldehyde, and characterized.In the latter complexes, the three isomers of green, orange and brown color have been isolated by column chromatography on alumina and their configurations have been established by their NMR spectra, i.e., the configuration of the green complex is in the trans-trans-trans positions for two ammine ligands, and two phenoxyl groups and two CH=NH groups of the coordinated salicyaldehydeaminato ligands, respectively, while those of the orange and brown complexes are in the trans-cis-cis and cis-cis-trans positions, respectively.