| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kandioller, Wolfgang
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2020Naphthoquinones of natural origin: Aqueous chemistry and coordination to half-sandwich organometallic cationscitations
- 2017Introducing the 4-Phenyl-1,2,3-Triazole Moiety as a Versatile Scaffold for the Development of Cytotoxic Ruthenium(II) and Osmium(II) Arene Cyclometalatescitations
- 2017Comparative equilibrium and structural studies of new pentamethylcyclopentadienyl rhodium complexes bearing (O, N) donor bidentate ligandscitations
- 2014Antitumor pentamethylcyclopentadienyl rhodium complexes of maltol and allomaltolcitations
Places of action
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article
Antitumor pentamethylcyclopentadienyl rhodium complexes of maltol and allomaltol
Abstract
<p>The reaction of the dimer [Rh<sup>III</sup>(pentamethylcyclopentadienyl) (μ-Cl)Cl]<sub>2</sub> ([Rh<sup>III</sup>(Cp*)(μ-Cl)Cl]<sub>2</sub>) with the hydroxypyrone ligands maltol and allomaltol affords complexes of the general formula [Rh<sup>III</sup>(Cp*)(L)Cl] under standard and microwave conditions. The organometallic compounds were characterized by standard analytical methods and in the case of the allomaltol derivative in the solid state by single-crystal X-ray diffraction analysis. The complexes showed similar cytotoxicity profiles and were proved to be moderately active against various human cancer cell lines. The stoichiometry and stability of these complexes were determined in aqueous solution by pH-potentiometry,<sup>1</sup>H NMR spectroscopy and UV-visible spectrophotometry. Speciation was studied in the presence and in the absence of chloride ions. Hydrolysis of [Rh<sup>III</sup>(Cp*)(H<sub>2</sub>O)<sub>3</sub>]<sup>2 +</sup> gave dimeric mixed hydroxido species [(Rh<sup>III</sup>(Cp*))<sub>2</sub>(μ-OH)<sub>3</sub>]<sup>+</sup> and [(Rh<sup>III</sup>(Cp*) )<sub>2</sub>(μ-OH)<sub>2</sub>Z<sub>2</sub>] (Z = H<sub>2</sub>O/Cl<sup>-</sup>). Formation of the mononuclear complexes [Rh<sup>III</sup>(Cp*)(L)Z] of maltol and allomaltol with similar and moderate stability was found. These species predominate at physiological pH and decompose only partially at micromolar concentrations. In addition, hydrolysis of the aqua complex or a chlorido/hydroxido co-ligand exchange resulted in the formation of the mixed-hydroxido species [Rh<sup>III</sup>(Cp*)(L)(OH)] in the basic pH range. Replacement of the chlorido by an aqua ligand in the complex [Rh<sup>III</sup>(Cp*)(L)Cl] was monitored and with the help of the equilibrium constants the extent of aquation at various chloride concentrations of the extra- and intracellular milieu can be predicted. Complexation of these Rh<sup>III</sup> complexes was compared to analogous [Ru<sup>II</sup>(η<sup>6</sup>-p-cymene)] species and higher conditional stabilities were found in the case of the Rh<sup>III</sup> compounds at pH 7.4.</p>