Reaction of some aliphatic diamines with four-co-ordinated unsymmetrical ketoenamine copper(II) and nickel(II) complexes

Abstract

The interaction between copper(II) and nickel(II) complexes of 3-acetyl-, 3-benzoyl-, and 3-ethoxycarbonyl-9-methyl-5,8-diazadodeca-3,9-diene-2,11-dione and some aliphatic diamines has been investigated. The copper and nickel chelates when refluxed in neat 1,2-diaminoethane formed complexes with 14-membered tetra-aza macrocycles, whereas under similar conditions the nickel chelates reacted with 1,3-diaminopropane forming acyclic 10-substituted (15-amino-4,11-dimethyl-5,8,12-triazapentadeca-3,9,11-trien-2-onato)nickel(II) derivatives instead of the expected corrin derivatives. The latter products may be considered as precursors to polynuclear species because of the presence of a free unco-ordinated primary amino-group in the molecule.