Metal Ion Directed Synthesis of 20‐Membered Octaaza Macrocyclic Complexes of Co(II), Ni(II), Cu(II), and Zn(II) and Their Physico‐chemical Properties

Abstract The template condensation reaction of 2,6‐diacetylpyridine and 2,6‐diaminopyridine forms a novel series of 20‐membered N8 macrocyclic complexes. The proposed stoichiometry and the nature of the macrocyclic complexes have been confirmed on the basis of elemental analyses and conductivity data, respectively. The bonding in these complexes has been envisaged from the findings of IR and 1H NMR spectral studies, while the overall geometry has been deduced from the results obtained from UV‐Visible, EPR spectral, and magnetic measurements.