Studies on the Complexation of a Nitrogen-Oxygen Donor Macrocyclic Ligand with Transition Metal Ions in Dioxane-Water Mixed Solvent

摘要

The protonation constants of 3,4 : 9,10-dibenzo-1,12-diaza-5,8-dioxacyclotetradecane (NenOenH4) and stability constants of its transition metal complexes have been determined by the potentiometric titration in 1 : 1 dioxane-water mixture with 0.1 ionic strength at 25?é. For a given anion system, the stabilitv constants of the complexes are in the order of Mn2+ < Co2+ < Ni2+ < Cu2+ > Zn2+, which accords with the Williams-Irving series.