Lanthanide(III) complexes are more active inhibitors of the Fenton reaction than pure ligands

Martin, Jan; Mladěnka, Přemysl; Saso, Luciano; Kostova, Irena

doi:10.1179/1351000215y.0000000031

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Our results can only be partially compared with those proposed by Georgieva et al [15] and by Martin et al [29]; in these works, the complex of formula Nd(CCA)2(NO3)(H2O) was synthesized and characterized by spectroscopic and computational methods. According to our hypothesis, the spectroscopic results suggest that CCAis bidentate bound to the metal ion through the carboxylic and the carbonylic moiety.…”

Section: Discussionmentioning

confidence: 48%

Thermodynamic Study on the Dissociation and Complexation of Coumarinic Acid with Neodymium(III) and Dioxouranium(VI) in Aqueous Media

2021

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In the frame of a systematic study on the sequestering ability of natural antioxidants towards metal cations, the complexation of coumarin-3-carboxilic acid (HCCA) with neodymium(III) and dioxouranium(VI) (uranyl, UO22+), and overall stability constants of the resulting complexes, were evaluated from the pH-potentiometric titration data at 37 °C and in an aqueous solution (i.e., 0.16 mol/L NaClO4). The graphic representation of the complex’s concentration curves is given by the distribution diagrams, which provide a depiction of all the species present in the solution in the selected pH ranges. The protonation constant of HCCA was also determined to evaluate the competition of the ligand for the metal cations and H+. The ligand-to-metal concentration ratio was varied between 1 and 10, and the hydrogen ion concentration was decreased stepwise until the incipient precipitation of a basic salt of the metal, which occurred at different values depending on the specific metal cation and the ligand to metal ratio. Speciation profiles obtained by potentiometric titrations and supported by UV-Vis data show that a complexation occurs at a ligand-to-Nd(III) and to –UO22+ ratio of 1:1 and 2:1, with different degrees of deprotonation: Nd(OH)(CCA)+, UO2(OH)(CCA), UO2(OH)2(CCA)−, and Nd(OH)(CCA)2, UO2(CCA)2 and (UO2)2(OH)2(CCA)2.

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Section: Discussionmentioning

confidence: 48%

Thermodynamic Study on the Dissociation and Complexation of Coumarinic Acid with Neodymium(III) and Dioxouranium(VI) in Aqueous Media

2021

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“…These reactions apparently occur with hydrogen peroxide molecules formed during the recombination of radical reactions on the oxidized surface of nanoparticles, which are rare earth metal oxides: Dy 2 O 3 or Gd 2 O 3 . The ability of rare earth metals to participate in such reactions has been reported in other studies [41][42][43]. Using an analogy with reactions involving Fe, it can be assumed that the interaction of dysprosium with hydrogen peroxide occurs as follows:…”

Section: Effect Of Rare Earth Metal Nanoparticlesmentioning

confidence: 77%

Nanosecond-Laser-Induced Breakdown of Aqueous Colloidal Solutions of Dysprosium Nanoparticles: The Influence of Nanoparticle Concentration on the Breakdown Plasma and the Intensity of Physical and Chemical Processes

Baimler,

Baryshev,

Dikovskaya

et al. 2024

Physics

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This paper studies the dynamics of the development of laser breakdown plasma in aqueous colloids of dysprosium nanoparticles by analyzing the time patterns of plasma images obtained using a high-speed streak camera. In addition, the distribution of plasma flashes in space and their luminosity were studied, and the amplitude of acoustic signals and the rate of generation of new chemical products were studied depending on the concentration of dysprosium nanoparticles in the colloid. Laser breakdown was initiated by pulsed radiation from a nanosecond Nd:YAG laser. It is shown that the size of the plasma flash, the speed of motion of the plasma–liquid interface, and the lifetime of the plasma flash decrease with an increasing concentration of nanoparticles in the colloid. In this case, the time delay between the beginning of the laser pulse and the moment the plasma flash reaches its maximum intensity increases with increasing concentrations of nanoparticles. Varying the laser fluence in the range from 67 J/cm2 to 134 J/cm2 does not lead to noticeable changes in these parameters, due to the transition of the breakdown plasma to the critical regime. For dysprosium nanoparticles during laser breakdown of colloids, a decrease in the yield of hydrogen peroxide and an increase in the rate of formation of hydroxyl radicals per water molecule, characteristic of nanoparticles of rare earth metals, are observed, which may be due to the participation of nanoparticles and hydrogen peroxide in reactions similar to the Fenton and Haber–Weiss reactions.

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Biological, biomedical and pharmaceutical applications of cerium oxide

Shcherbakov

Zholobak

Иванов

2020

Cerium Oxide (CeO₂): Synthesis, Properties and Applications

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Lanthanide(III) complexes are more active inhibitors of the Fenton reaction than pure ligands

Abstract: Lanthanide(III) complexes were proven to block the iron-driven production of the hydroxyl radical. Second, the lanthanide(III) element appears to be crucial for the anti-oxidant effect. Overall, lanthanum complexes may be promising direct anti-oxidants for future testing.

Cited by 6 publications

References 30 publications

Thermodynamic Study on the Dissociation and Complexation of Coumarinic Acid with Neodymium(III) and Dioxouranium(VI) in Aqueous Media

Thermodynamic Study on the Dissociation and Complexation of Coumarinic Acid with Neodymium(III) and Dioxouranium(VI) in Aqueous Media

Nanosecond-Laser-Induced Breakdown of Aqueous Colloidal Solutions of Dysprosium Nanoparticles: The Influence of Nanoparticle Concentration on the Breakdown Plasma and the Intensity of Physical and Chemical Processes

Biological, biomedical and pharmaceutical applications of cerium oxide

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