The influence of electronegativity of atoms in terminal ligands on magnetic coupling interactions has been analyzed with perturbation theory. It is shown that the interaction among the magnetic centers is reducecd with an increase in electronegativity of atoms in terminal ligands. By density functional theory and the broken symmetry approach the calculations have been performed on some binuclear Cu(II) molecules. The calcuated results supported the above conclusion.

Key words: magnetic coupling, electronegativity, perturbation theory, COPPER COMPLEX