Aniono-pentaaminecobalt(III) complexes with polyamine ligands. Part 23. A chloropentaamine by-product from the preparation of the trans-CoCl2(en) cation

The isolation and characterisation of [CoCl(en)(L)]ZnCl₄, L = NH₂CH₂CH?NCH₂CH₂NH₂ (1,4,7-triazahept-3-ene), as a by-product (～ 8% yield) from the H₂O₂ synthesis of trans-CoCl₂(en), is described.