Abstract
The template condensation between dichloromethane and diamines (1,2-diaminoethane and 1,3-diaminopropane) in presence of nickel(II) and copper(II) ions are described. Formation of the new complexes [Ni(TACD)(H 2 O) 2 ]Cl 2 .4H 2 O, [Cu(TACD)]Cl 2· 4H 2 O, [Cu(TADD)]Cl 2 and [Cu 2 (TADD)(H 2 O) 4 ]Cl 4 .2H 2 O of the macrocycles 1,3,6,8-tetraazacyclodecane (TACD) and 1,3,7,9-tetraazacyclododecane (TADD) and the ligand hydrochlorides TACD.4HCl and TADD.4HCl has been supported by elemental analyses, conductivity measurements and spectral studies. Potentiometric equilibrium studies on the TACD and TADD hydrochlorides and their metal complexes with nickel(II) and copper(II) also support the structures. The high values of stability constants obtained are also in favour of cyclic structures of the molecules.
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