Divalent nickel, cobalt and copper complexes of tetradentate macrocycle, dibenzo ( f, n) 2, 4, 10, 12- tetramethyl-1, 5, 9, 13-tetrazacyclohexadeca [16] 1, 3, 9, 11-tetraene

Abstract

Metaphenylenediamine and acetylacetone react in presence of divalent nickel, cobalt and copper salts to form complexes of a 16-membered N 4 tetradentate macrocycle, dibenzo-(f,n)-2, 4, 10, 12-tetramethyl-1, 5, 9, 13-tetrazacyclohexadeca-[16]-1, 3, 9, 11-tetraene. The complexes are characterised to be distorted octahedral of the type [M(Me 4[16] 1, 3, 9, 11-tetraene N 4)X 2] where M = Ni(II), Co(II) and Cu(II); X = Cl, Br, NO 3 or NCS. The ligand coordinates through azomethine or imine nitrogen atoms which are bridged by acetylacetone moieties. The electrical conductance, molecular weight, magnetic, electronic and IR spectra are discussed.