Synthesis and Characterization of Cobalt(III) Complexes with N-Hydroxy-N′-(2-alkylaminoethyl)-2,3-butanediimines and the Corresponding 2-Phenylaminoethyl Compound

Abstract

Cobalt(III) complexes with N-hydroxy-N′- (2-alkylaminoethyl)-2,3-butanediimines and the corresponding 2-phenylaminoethyl compound (Hdox-enR; R=Me, Et and Ph) have been studied. Compounds of the type Co(dox-enR)₂X have been obtained (X=Cl, Br, I, NO₃, and ClO₄) in crystals. Mainly on the basis of electronic absorption spectra and magnetic properties, it is concluded that they are hexa-coordinate cobalt(III) complexes of a spin-paired type, in which the ligands are bound, in their deprotonated anionic form, to the cobalt(III) ion. The ligands function as terdente ligands, the secondary amino-group also being involved in the bonding with the cobalt(III) ion.