Synthesis and Physico-chemical Properties of Some Complexes of Tetradentate Macrocycles with Cd, Hg and Pb

Abstract

The reaction of 3,6-diaza-1,8-diaminooctane with α-diketones viz., 2,3-butanedione, 2,3-pentanedione, 3,4-hexanedione or benzil in the presence of metal salts of Cd(II), Hg(II) and Pb(II) affords complexes of the type [MLX]X (M = Cd(II); X = NO₃, M = Pb; X = ClO₄) and [MLX₂] (M = Cd(II), Hg(II); X = Cl). Elemental analyses, molar conductivity, molecular weight determination and spectra (IR and ¹H NMR) have been used to characterize the structure of the isolated solid complexes. These studies suggest the coordination number five for Cd(II) and Pb(II) and six for Cd(II) and Hg(II).