Abstract
This paper presents the synthesis of two new (p-cymene)-ruthenium(II) complexes 3a,b with the bidentate coumarin ligands 2a,b. Both complexes were characterized by FTIR spectroscopy, 1H NMR, 13C NMR, MS, elemental analysis and DFT calculations. The X-ray structure of complex 3a was also solved. The cytotoxic properties of both complexes were examined on human leukemia NALM-6 and HL-60 cells and melanoma WM-115 cells. The complexes possess higher cytotoxic activity than the ligands, but distinctive result is for complex 3b, which exhibited higher cytotoxic effect on WM-115 cells (IC50=60.2±7.8μM) in comparison to carboplatin (IC50=422.2±50.2μM). The results of DFT calculations performed at the BP86-D3/QZ4P level for Ru(II) complexes and Pd(II) complexes with the same ligands indicate that Pd(II) complexes are more lipophilic. Moreover the RP-TLC-Based Lipophilicity assessment was also performed.
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