| Abstract: | The mode of coordination of complexes formed in the systems Cd(II) or Hg(II)/cytidine/di- or triamine is proposed on the basis of equilibrium and spectroscopic studies. Mercury(II) binds much more strongly to cytidine and polyamine (PA) than cadmium. It was found from equilibrium and 13 C NMR studies that in the Hg(II) and Cd(II)/ Cyd /di- or triamine complexes, metallation mainly involves the N(3) atom of the pyrimidine base of the nucleoside and m NH x + groups from PA. In MLL' complexes of both metals with diamines, all available donor nitrogen atoms of the polyamine are involved in coordination. In analogous systems with triamines, interaction of all nitrogen atoms is observed for Cd(II) systems as well as in the Hg( Cyd )(2,3- tri ) species. Only two nitrogen atoms of the polyamine coordinate in ternary Hg(II) complexes with dien, 3,3-tri and Spd . |
