Heteropentanuclear Oxalato-Bridged nd-4f (n=4, 5) Metal Complexes with NO Ligand: Synthesis, Crystal Structures, Aqueous Stability and Antiproliferative Activity
- Author(s)
- Paul-Steffen Kuhn, Laura Cremer, Anatolie Gavriluta, Katarina K. Jovanovic, Lana Filipovic, Alfred A. Hummer, Gabriel Büchel, Biljana P. Dojcinovic, Samuel M. Meier, Annette Rompel, Sinisa Radulovic, Jean Bernard Tommasino, Dominique Luneau, Vladimir B. Arion
- Abstract
A series of heteropentanuclear oxalate-bridged Ru(NO)-Ln (4d-4f) metal complexes of the general formula (nBu4N)5[Ln{RuCl3(μ-ox)(NO)}4], where Ln=Y (2), Gd (3), Tb (4), Dy (5) and ox=oxalate anion, were obtained by treatment of (nBu4N)2[RuCl3(ox)(NO)] (1) with the respective lanthanide salt in 4:1 molar ratio. The compounds were characterized by elemental analysis, IR spectroscopy, electrospray ionization (ESI) mass spectrometry, while 1, 2, and 5 were in addition analyzed by X-ray crystallography, 1 by Ru K-edge XAS and 1 and 2 by 13CNMR spectroscopy. X-ray diffraction showed that in 2 and 5 four complex anions [RuCl3(ox)(NO)]2- are coordinated to YIII and DyIII, respectively, with formation of [Ln{RuCl3(μ-ox)(NO)}4]5- (Ln=Y, Dy). While YIII is eight-coordinate in 2, DyIII is nine-coordinate in 5, with an additional coordination of an EtOH molecule. The negative charge is counterbalanced by five nBu4N+ ions present in the crystal structure. The stability of complexes 2 and 5 in aqueous medium was monitored by UV/Vis spectroscopy. The antiproliferative activity of ruthenium-lanthanide complexes 2-5 were assayed in two human cancer cell lines (HeLa and A549) and in a noncancerous cell line (MRC-5) and compared with those obtained for the previously reported Os(NO)-Ln (5d-4f) analogues (nBu4N)5[Ln{OsCl3(ox)(NO)}4] (Ln=Y (6), Gd (7), Tb (8), Dy (9)). Complexes 2-5 were found to be slightly more active than 1 in inhibiting the proliferation of HeLa and A549 cells, and significantly more cytotoxic than 5d-4f metal complexes 6-9 in terms of IC50 values. The highest antiproliferative activity with IC50 values of 20.0 and 22.4μM was found for 4 in HeLa and A549 cell lines, respectively. These cytotoxicity results are in accord with the presented ICP-MS data, indicating five- to eightfold greater accumulation of ruthenium versus osmium in human A549 cancer cells. The metal makes the difference: A series of heteropentanuclear metal complexes of the general formula (nBu4N)5[Ln{RuCl3(μ-ox)(NO)}4], where Ln=Y (2), Gd (3), Tb (4), Dy (5) and ox=oxalate anion, were synthesized from (nBu4N)[RuCl3(ox)(NO)] (1) (see figure). The antiproliferative activity of ruthenium-lanthanide complexes 2-5 in two human cancer cell lines (HeLa and A549) was found to be significantly higher than that for the previously reported Os(NO)-Ln (5d-4f) analogues (nBu4N)5[Ln{OsCl3(μ-ox)(NO)}4] (Ln=Y (6), Gd (7), Tb (8), Dy (9)).
- Organisation(s)
- Department of Inorganic Chemistry, Department of Biophysical Chemistry, Department of Analytical Chemistry, Core Facility Crystal Structure Analysis
- External organisation(s)
- Université Claude-Bernard-Lyon-I, Institute of Oncology and Radiology of Serbia, University of Belgrade, University of Vienna
- Journal
- Chemistry: A European Journal
- Volume
- 21
- Pages
- 13703-13713
- No. of pages
- 11
- ISSN
- 0947-6539
- DOI
- https://doi.org/10.1002/chem.201502026
- Publication date
- 09-2015
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 104003 Inorganic chemistry, 104017 Physical chemistry, 105113 Crystallography
- Keywords
- ASJC Scopus subject areas
- Catalysis, Organic Chemistry
- Sustainable Development Goals
- SDG 3 - Good Health and Well-being
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/94971965-5f81-4e3d-a5e6-ad05a02d6fd6