The preparation of 5,7,7,12,14-pentamethyl-1,4,8,11-tetra-azacyclotetradeca-4,11-diene and its complexes with copper(II), nickel(II), zinc(II), and cobalt(III)

Abstract

The reaction of 1,2-diaminoethane monohydroperchlorate with an equimolar mixture of mesityl oxide and pent-3-en-2-one in methanol solution gives a number of macrocyclic tetra-azacyclotetradecadienes, however, the main product (ca. 70%) is the new macrocyclic ligand 5,7,7,12,14-pentamethyl-1,4,8,11-tetra-azacyclotetradeca-4,11-diene (L) as its dihydroperchlorate salt. The characterisation of the ligand and some copper(II), nickel(II), and zinc(II) complexes is described. In addition, a series of cobalt(III) complexes of the type trans-[CoLX₂]⁺[X₂= Cl₂, (NO₂)₂, Br₂, (N₃)₂, Cl(NO₂), or (NCS)₂] and the µ-peroxo complex [(H₂O)LCo(µ-O₂)CoL(H₂O)][ClO₄]₄ have been prepared. Infrared and electronic spectra are reported.