Synthesis, spectroscopic characterization and computational study of Ru(II)/DMSO complexes with monocoordinated carbazate ligands

Reaction of the precursorcis,fac-[RuCl2(dmso-S)(3)(dmso-O)] with three carbazate ligands led to new compounds of the typecis,fac-[RuCl2(dmso-S)(3)(L)] (L = benzylcarbazate (bc),1; 4-methoxybenzylcarbazate (mc),2; or 3,5-dimethoxy-alpha,alpha-dimethylbenzylcarbazate (mmc),3). Complexes1-3have been characterized by elemental analysis (CHN), FTIR, UV-vis, and(1)H and(13)C{H-1} NMR spectroscopy. Complex1was also analyzed by single-crystal X-ray diffraction and theoretical calculations were performed in order to better understand its spectroscopic data and electronic structure. All collected data were consistent with substitution of one dmso ligand by a monodentate carbazate ligand. Preliminary biological assays against breast and prostate human cancer cell lines were performed in order to evaluate the cytotoxic activity of these three new complexes.