Some cyclic tetra-amines and their metal-ion complexes. Part V. Cobalt(III) complexes of two isomeric 5,7,7,12,12,14-hexamethyl-1,4,8,11-tetra-azacyclotetradecanes

Abstract

The preparations and properties of some octahedral cobalt(III) complexes of the C-meso and C-racemic isomers of the cyclic tetra-amine 5,7,7,12,12,14-hexamethyl-1,4,8,11-tetra-azacyclotetradecane (tetc and tetd), are described. Both isomers from trans-cobalt(III) derivatives with unidentate ligands occupying the axial co-ordination sites and, in addition, the isomer tetd, which is probably the meso form, can form cis derivatives such as [Co(tetd)C₂O₄]⁺. The trans derivatives [Co(tetc)XY]⁺(where X = Y = Cl^–, CN^–, NCS^–, and NO₂^–; X = Cl^–, Y = CH₃CO₂^–), [Co(tetc)(H₂O)₂]³⁺, and [Co (tetd)Cl₂]⁺, and the cis derivative [Co (tetd)C₂O₄]⁺, are described.