AntoninaTzekova Nikolova

Four Pd(II) and Pd(IV) complexes with 3-thiolanespiro-5’-hydantoin and 4-thio-1H-tetrahydropyranespiro-5’-hydantoin were synthesized. Thechemical structures of newcomplexes were studied by elemental analysis, IR, 1H, 13C NMR spectra. The spectroscopic investigation of new palladium complexes in comparison with the metal free ligands show that the bonding of the ligands with metal ions is realized through the sulfur atom from the S-containing saturated rings. This coordination mode is in accordance with the data obtained for the platinum complexes with the same ligands. The new complexes were investigated for cytotoxicity on panel of human tumor cell lines. The tested compounds exerted concentration-dependent cytotoxic effects against some of the tumor cell lines.