Publications de Marinella Mazzanti

C−C Bond Cleavage and Carbonylation Enabled by an NNN-Pincer Uranium Scaffold via Metal-Arene Interaction

Raw data accompanying the paper. Metal-arene complexes have recently attracted an increasing interest in f-element chemistry, but the functionalization of arenes mediated by uranium-arene interactions is limited to a single example. Here, we report a new ...

Zenodo2025

Resonant inelastic X-ray scattering tools to count 5 f electrons of actinides and probe bond covalency

Marinella Mazzanti

The actinides possess a complex electronic structure, making their chemical and physical properties among the least understood in the periodic table. Advanced spectroscopic tools, able to obtain deep insights into the electronic structure and binding prope ...

NATURE PORTFOLIO2025

Dinitrogen Reduction and Functionalization by a Siloxide Supported Thulium-Potassium Complex for the Formation of Ammonia or Hydrazine Derivatives

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic

The dinitrogen (N2) chemistry of lanthanides remains less developed compared to the d-block metals and lanthanide-promoted N2 functionalization chemistry in well-defined lanthanide complexes remains elusive. Here we report the synthesis and characterizatio ...

Wiley-VCH Verlag GmbH2025

Surface enhanced nuclear magnetic resonance spectroscopy at solid-liquid interfaces using Overhauser dynamic nuclear polarization

Marinella Mazzanti, David Lyndon Emsley, Yu Rao, Pragati Pandey

While solid-liquid interfaces are ubiquitous, detecting the associated surface sites under ambient conditions remains a grand challenge. Previously, we demonstrated the hyperpolarization by Overhauser effect dynamic nuclear polarization (OE-DNP) of ligands ...

American Chemical Society (ACS)2025

Facile N-C bond cleavage and arene reduction by a transient uranium(ii) complex

Andrzej Sienkiewicz, Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic

Complexes of uranium(ii) remain extremely rare and their reactivity is practically unexplored. Here we report that the reduction of the heteroleptic bis-aryloxide U(iii) complex [U(κ6-{(tBu2ArO)2Me2-cyclam})I], A, yields a rare and highly reactive U(ii) in ...

2025

Catalytic and stoichiometric stepwise conversion of side-on bound dinitrogen to ammonia mediated by a uranium complex

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Lucile Sylvie Danielle Chatelain

The well-defined catalytic conversion of dinitrogen (N2) to ammonia (NH3) by molecular complexes is of fundamental interest and important for providing an atomic-level understanding of reactivity that can be related to industrial and biological nitrogen-fi ...

2025

Structure and Magnetic Properties of a Series of Uranium Bis-Siloxide Complexes

Marinella Mazzanti, Ivica Zivkovic, Farzaneh Fadaei Tirani, Luciano Barluzzi

Despite their synthetic interest and potential attractive properties, the preparation of heteroleptic U(III) complexes containing monodentate ligands remains challenging. Here we report the synthesis, structure and magnetic properties of three heteroleptic ...

WILEY-V C H VERLAG GMBH2025

Iron promoted end-on dinitrogen-bridging in heterobimetallic complexes of uranium and lanthanides

Rosario Scopelliti, Marinella Mazzanti, Nadir Jori

End-on binding of dinitrogen to low valent metal centres is common in transition metal chemistry but remains extremely rare in f-elements chemistry. In particular, heterobimetallic end-on N2 bridged complexes of lanthanides are unprecedented despite their ...

Royal Soc Chemistry2024

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

Two-Electron Redox Reactivity of Thorium Supported by Redox-Active Tripodal Frameworks

Rosario Scopelliti, Marinella Mazzanti, Damien Wen Chen, Fang-Che Hsueh

The high stability of the + IVoxidation state limits thorium redox reactivity. Here we report the synthesis and the redox reactivity of two Th(IV) complexes supported by the arene-tethered tris(siloxide) tripodal ligands [(KOSiR2Ar)3-arene)]. The two-elect ...

Wiley-VCH Verlag GmbH2024

Multielectron Redox Chemistry of Ytterbium Complexes Reaching the +1 and Zero Formal Oxidation States

Andrzej Sienkiewicz, Rosario Scopelliti, Marinella Mazzanti

Lanthanide redox reactivity remains limited to one-electron transfer reactions due to their inability to access a broad range of oxidation states. Here, we show that multielectron reductive chemistry is achieved for ytterbium by using the tripodal tris(sil ...

2024

Siloxide tripodal ligands as a scaffold for stabilizing lanthanides in the +4 oxidation state

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Fang-Che Hsueh

Synthetic strategies to isolate molecular complexes of lanthanides, other than cerium, in the +4 oxidation state remain elusive, with only four complexes of Tb(iv) isolated so far. Herein, we present a new approach for the stabilization of Tb(iv) using a s ...

Royal Soc Chemistry2024

A trinuclear metallasilsesquioxane of uranium(III)

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Farzaneh Fadaei Tirani, Nadir Jori

The silsesquioxane ligand (Bu-i)(7)Si7O9(OH)(3) ((POSSH3)-P-iBu) is revealed as an attractive system for the assembly of robust polynuclear complexes of uranium(III) and allowed the isolation of the first example of a trinuclear U(III) complex ([U-3((POSS) ...

Royal Society of Chemistry2024

An Efficient and Stable Polarizing Agent for In-Cell Magic-Angle Spinning Dynamic Nuclear Polarization NMR Spectroscopy

Marinella Mazzanti, David Lyndon Emsley, Pierrick Berruyer, Andrea Bertarello, Amrit Venkatesh

Nuclear Magnetic Resonance (NMR) spectroscopy would be a method of choice to follow biochemical events in cells because it can analyze molecules in complex environments. However, the intrinsically low sensitivity of NMR makes in-cell measurements challengi ...

2024

Synthesis, structure and redox properties of single-atom bridged diuranium complexes supported by aryloxides

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Luciano Barluzzi, Fang-Che Hsueh

Single-atom (group 15 and group 16 anions) bridged dimetallic complexes of low oxidation state uranium provide a convenient route to implement multielectron transfer and promote magnetic communication in uranium chemistry, but remain extremely rare. Here w ...

ROYAL SOC CHEMISTRY2024

Accessing a Highly Reducing Uranium(III) Complex through Cyclometalation

Rosario Scopelliti, Marinella Mazzanti, Dieuwertje Katelijn Modder

2024

Isolation and redox reactivity of cerium complexes in four redox states

Andrzej Sienkiewicz, Rosario Scopelliti, Marinella Mazzanti, Fang-Che Hsueh

The chemistry of lanthanides is limited to one electron transfer reactions due to the difficulty of accessing multiple oxidation states. Here we report that a redox-active ligand combining three siloxides with an arene ring in a tripodal ligand can stabili ...

2023

Multimetallic Uranium Nitride Cubane Clusters from Dinitrogen Cleavage

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Farzaneh Fadaei Tirani

Dinitrogen cleavage provides an attractive but poorly studied route to the assembly of multimetallic nitride clusters. Here, we show that the monoelectron reduction of the dinitrogen complex [{U(OC6H2-Bu-3(t)-2,4,6)(3)}(2)(mu-eta(2):eta(2)-N-2)], 1, allows ...

2023

A Route to Stabilize Uranium(II) and Uranium(I) Synthons in Multimetallic Complexes

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Dieuwertje Katelijn Modder

Herein, we report the redox reactivity of a multimetallic uranium complex supported by triphenylsiloxide (−OSiPh3) ligands, where we show that low valent synthons can be stabilized via an unprecedented mechanism involving intramolecular ligand migration. T ...

Wiley-VCH Verlag GmbH2023

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