Publications de Radmila Faizova

The isotopic signature of U(V) during bacterial reduction

Marinella Mazzanti, Rizlan Bernier-Latmani, Radmila Faizova, Margaux Camille Andréa Molinas, Ashley Richards Brown

The two-step electron transfer during bacterial reduction of UVI to UIV is typically accompanied by mass-independent fractionation of the 238U and 235U isotopes, whereby the heavy isotope accumulates in the reduced product. However, the role of the UV inte ...

2024

Mechanism of Reduction of Aqueous U(V)-dpaea and Solid-Phase U(VI)-dpaea Complexes: The Role of Multiheme c-Type Cytochromes

Marinella Mazzanti, Rizlan Bernier-Latmani, Karin Lederballe Meibom, Radmila Faizova, Margaux Camille Andréa Molinas

The biological reduction of soluble U(VI) complexes to form immobile U(IV) species has been proposed to remediate contaminated sites. It is well established that multiheme c-type cytochromes (MHCs) are key mediators of electron transfer to aqueous phase U( ...

2023

The mechanism of Fe induced bond stability of uranyl(v)

Marinella Mazzanti, Farzaneh Fadaei Tirani, Radmila Faizova

The stabilization of uranyl(v) (UO21+) by Fe(ii) in natural systems remains an open question in uranium chemistry. Stabilization of UVO21+ by Fe(ii) against disproportionation was ...

ROYAL SOC CHEMISTRY2022

Synthesis and Characterization of Water Stable Uranyl(V) Complexes

Anne-Sophie Chauvin, Marinella Mazzanti, Farzaneh Fadaei Tirani, Radmila Faizova

The importance of uranyl(V) (UO2+) species associated with environmental and geologic applications is becoming increasingly evident, but the tendency of the uranyl(V) cation to disproportionate in water has prevented the isolation of stable complexes. Here ...

Wiley-VCH Verlag GmbH2021

Biological reduction of a U(V)-organic ligand complex

Radmila Faizova, Margaux Camille Andréa Molinas, Ashley Richards Brown

Metal-reducing microorganisms such as Shewanella oneidensis MR-1 reduce highly soluble species of hexavalent uranyl (U(VI)) to less mobile tetravalent uranium (U(IV)) compounds. The biologically mediated immobilization of U(VI) is being considered for the ...

2021

Synthesis, reactivity, and environmental relevance of uranyl(V) complexes

Radmila Faizova

Knowledge of fundamental chemical properties of all environmentally relevant uranium species is essential to understand environmental uranium mobility and develop novel remediation strate-gies. A myriad of uranium(VI) and uranium(IV) compounds has been stu ...

EPFL2020

Ligand-Supported Facile Conversion of Uranyl(VI) into Uranium(IV) in Organic and Aqueous Media

Marinella Mazzanti, Rizlan Bernier-Latmani, Farzaneh Fadaei Tirani, Radmila Faizova

Reduction of uranyl(VI) to U-V and to U-IV is important in uranium environmental migration and remediation processes. The anaerobic reduction of a uranyl U-VI complex supported by a picolinate ligand in both organic and aqueous media is presented. The [(UO ...

Wiley-VCH Verlag GmbH2020

Structural Snapshots of Cluster Growth from {U6 } to {U38 } During the Hydrolysis of UCl4

Marinella Mazzanti, Farzaneh Fadaei Tirani, Lucile Sylvie Danielle Chatelain, Radmila Faizova

Herein we report the assembly of large uranium(IV) clusters with novel nuclearities and/or shapes from the controlled hydrolysis of UCl4 in organic solution and in the presence of the benzoate ligands. {U6}, {U13}, {U16}, {U24}, {U38} oxo and oxo/hydroxo c ...

Wiley-VCH Verlag GmbH2019

Uncovering unprecedented uranium species: From water-stable uranyl(V) to U(IV) POM clusters

Rosario Scopelliti, Marinella Mazzanti, Lucile Sylvie Danielle Chatelain, Radmila Faizova

AMER CHEMICAL SOC2019

The effect of iron binding on uranyl(V) stability

Rosario Scopelliti, Marinella Mazzanti, Radmila Faizova

Here we report the effect of UO2+⋯Fe2+ cation–cation interactions on the redox properties of uranyl(V) complexes and on their stability with respect to proton induced disproportionation. The tripodal heptadentate Schiff base trensal3− ligand allowed the sy ...

2018

Synthesis and Characterization of a Water Stable Uranyl(V) Complex

Rosario Scopelliti, Anne-Sophie Chauvin, Marinella Mazzanti, Radmila Faizova

We have identified a polydentate aminocarboxylate ligand that stabilizes uranyl(V) in water. The mononuclear [UO2(dpaea)]X, (dpaeaH2 = Bis(pyridyl-6-methyl-2-carboxylate)-ethylamine; X = CoCp2*+ or X = K(2.2.2.cryptand) complexes have been isolated from an ...

2018