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Open AccessArticle

Half-Sandwich Ru(II) and Os(II) Bathophenanthroline Complexes Containing a Releasable Dichloroacetato Ligand

1
Department of Inorganic Chemistry & Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University in Olomouc, 17. listopadu 12, 771 46 Olomouc, Czech Republic
2
Department of Cell Biology and Genetics & Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
*
Author to whom correspondence should be addressed.
Molecules 2018, 23(2), 420; https://doi.org/10.3390/molecules23020420
Received: 15 January 2018 / Revised: 8 February 2018 / Accepted: 12 February 2018 / Published: 14 February 2018
We report on the preparation and thorough characterization of cytotoxic half-sandwich complexes [Ru(η6-pcym)(bphen)(dca)]PF6 (Ru-dca) and [Os(η6-pcym)(bphen)(dca)]PF6 (Os-dca) containing dichloroacetate(1–) (dca) as the releasable O-donor ligand bearing its own cytotoxicity; pcym = 1-methyl-4-(propan-2-yl)benzene (p-cymene), bphen = 4,7-diphenyl-1,10-phenanthroline (bathophenanthroline). Complexes Ru-dca and Os-dca hydrolyzed in the water-containing media, which led to the dca ligand release (supported by 1H NMR and electrospray ionization mass spectra). Mass spectrometry studies revealed that complexes Ru-dca and Os-dca do not interact covalently with the model proteins cytochrome c and lysozyme. Both complexes exhibited slightly higher in vitro cytotoxicity (IC50 = 3.5 μM for Ru-dca, and 2.6 μM for Os-dca) against the A2780 human ovarian carcinoma cells than cisplatin (IC50 = 5.9 μM), while their toxicity on the healthy human hepatocytes was found to be IC50 = 19.1 μM for Ru-dca and IC50 = 19.7 μM for Os-dca. Despite comparable cytotoxicity of complexes Ru-dca and Os-dca, both the complexes modified the cell cycle, mitochondrial membrane potential, and mitochondrial cytochrome c release by a different way, as revealed by flow cytometry experiments. The obtained results point out the different mechanisms of action between the complexes. View Full-Text
Keywords: ruthenium; osmium; half-sandwich; dichloroacetate(1–); cytotoxicity; flow cytometry ruthenium; osmium; half-sandwich; dichloroacetate(1–); cytotoxicity; flow cytometry
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MDPI and ACS Style

Štarha, P.; Trávníček, Z.; Vančo, J.; Dvořák, Z. Half-Sandwich Ru(II) and Os(II) Bathophenanthroline Complexes Containing a Releasable Dichloroacetato Ligand. Molecules 2018, 23, 420. https://doi.org/10.3390/molecules23020420

AMA Style

Štarha P, Trávníček Z, Vančo J, Dvořák Z. Half-Sandwich Ru(II) and Os(II) Bathophenanthroline Complexes Containing a Releasable Dichloroacetato Ligand. Molecules. 2018; 23(2):420. https://doi.org/10.3390/molecules23020420

Chicago/Turabian Style

Štarha, Pavel; Trávníček, Zdeněk; Vančo, Ján; Dvořák, Zdeněk. 2018. "Half-Sandwich Ru(II) and Os(II) Bathophenanthroline Complexes Containing a Releasable Dichloroacetato Ligand" Molecules 23, no. 2: 420. https://doi.org/10.3390/molecules23020420

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