Synthesis, characterization and biological evaluation of dipicolylamine sulfonamide derivatized platinum complexes as potential anticancer agents.

Three new Pt complexes, [PtCl(N(SO(2-nap))dpa)], [PtCl(N(SO(1-nap))dpa)] and [PtCl(N(SOpip)dpa)], containing a rare 8-membered ring were synthesized in good yield and high purity by utilizing the ligands N(SO(2-nap))dpa, N(SO(1-nap))dpa and N(SOpip)dpa, which contain a dipicolylamine moiety. Structural studies of all three complexes confirmed that the ligands are bound in a bidentate mode Pt-N bonds forming a rare 8-membered ring. The intense fluorescence displayed by the ligands is quenched upon coordination to Pt.