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Marinella Mazzanti

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Publications associées (104)

Synthesis, structure, and reactivity of uranium(VI) nitrides

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

Uranium nitride compounds are important molecular analogues of uranium nitride materials such as UN and UN2 which are effective catalysts in the Haber-Bosch synthesis of ammonia, but the synthesis of molecular nitrides remains a challenge and studies of th ...

2021

Delivery of a Masked Uranium(II) by an Oxide-Bridged Diuranium(III) Complex

Marinella Mazzanti, Farzaneh Fadaei Tirani, Dieuwertje Katelijn Modder

Oxide is an attractive linker for building polymetallic complexes that provide molecular models for metal oxide activity, but studies of these systems are limited to metals in high oxidation states. Herein, we synthesized and characterized the molecular an ...

Wiley-VCH Verlag GmbH2021

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

Structure and small molecule activation reactivity of a metallasilsesquioxane of divalent ytterbium

Rosario Scopelliti, Marinella Mazzanti, Aurélien René Willauer

The first metallasilsesquioxane of a divalent lanthanide, Yb{Cy7Si7O11(OSiMe3)}(THF),1, was synthesized and structurally characterized. The Cy7Si7O11(OSiMe3)(2-)ligands in1bind two Yb(ii) ions in a bridging mode. The dinuclear complex effects the two- ...

Royal Society of Chemistry2020

Photochemical Synthesis of a Stable Terminal Uranium(VI) Nitride

Rosario Scopelliti, Marinella Mazzanti, Luciano Barluzzi

Terminal uranium nitrides have so far proven impossible to isolate by photolysis of azides. Here we report the second ever example of an isolated terminal uranium(VI) nitride. We show that the terminal nitride [NBu4] [U(OSi((OBu)-Bu-t)(3))(4)(N)], 3, can b ...

2020

Carbon Dioxide Reduction by Multimetallic Uranium(IV) Complexes Supported by Redox-Active Schiff Base Ligands

Rosario Scopelliti, Marinella Mazzanti, Marta Falcone, Nadir Jori

The synthesis, structure, and reactivity with CO2 and CS2 of new U(IV) complexes with a redox-active Schiff base are reported. The reaction of UI3 with the heptadentate Schiff base ligand 2,2',2 ''-tris(salicylideneimino)-triethylamine (trensal) did not le ...

2020

C-H Bond Activation by an Isolated Dinuclear U(III)/U(IV) Nitride

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic

Synthetic studies of bimetallic uranium nitride complexes with the N(SiMe3)(2) ligand have generated a new nitride complex of U(III), which is highly reactive toward C-H bonds and H-2. Treatment of the previously reported U(IV)/U(IV) nitride complex [Na(DM ...

2020

Anhydrous Conditions Enable the Catalyst-Free Carboxylation of Aromatic Alkynes with CO2 under Mild Conditions

Paul Joseph Dyson, Marinella Mazzanti, Felix Daniel Bobbink, Davide Toniolo

The direct carboxylation of aromatic alkynes with CO2, a cheap and widely available C1 source, is the most attractive method for the synthesis of carboxylic acids. Here we show that direct carboxylation of terminal alkynes can be simply performed in near-q ...

2020

Assembly of High-Spin [Fe-3] Clusters by Ligand-Based Multielectron Reduction

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Davide Toniolo

The hexanuclear [Na12Fe6(tris-cyclo-salophen)(2)(THF)(14)], 1-THF, and the trinuclear [Na6Fe3(tris-cyclo-salophen)(py)(9)], 1-py, Fe(II) clusters can be easily assembled in one step from the ligand-based reduction of the [FeII(salophen)(THF)] complex. Thes ...

2020

Accessing the plus IV Oxidation State in Molecular Complexes of Praseodymium

Marinella Mazzanti, Ivica Zivkovic, Farzaneh Fadaei Tirani, Aurélien René Willauer

Out of the 14 lanthanide (Ln) ions, molecular complexes of Ln(IV) were known only for cerium and more recently terbium. Here we demonstrate that the +IV oxidation state is also accessible for the large praseodymium (Pr) cation. The oxidation of the tetraki ...

2020

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

Carbon dioxide reduction by lanthanide(iii) complexes supported by redox-active Schiff base ligands

Rosario Scopelliti, Marinella Mazzanti, Davide Toniolo, Nadir Jori

Here we have explored the ability of Schiff bases to act as electron reservoirs and to enable the multi-electron reduction of small molecules by lanthanide complexes. We report the reductive chemistry of the Ln(iii) complexes of the tripodal heptadentate S ...

2020

Stabilization of the Oxidation State plus IV in Siloxide-Supported Terbium Compounds

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Aurélien René Willauer

The synthesis of lanthanides other than cerium in the oxidation state +IV has remained a desirable but unmet target until recently, when two examples of Tb-IV with saturated coordination spheres were isolated. Here we report the third example of an isolate ...

Wiley-VCH Verlag GmbH2020

Facile N-functionalization and strong magnetic communication in a diuranium(v) bis-nitride complex

Marinella Mazzanti, Ivica Zivkovic, Farzaneh Fadaei Tirani, Lucile Sylvie Danielle Chatelain, Luciano Barluzzi

Uranium nitride complexes are of high interest because of their ability to effect dinitrogen reduction and functionalization and to promote magnetic communication, but studies of their properties and reactivity remain rare. Here we have prepared in 73% yie ...

2019

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

Carbon dioxide reduction by dinuclear Yb(ii) and Sm(ii) complexes supported by siloxide ligands

Marinella Mazzanti, Farzaneh Fadaei Tirani, Davide Toniolo

Two dinuclear homoleptic complexes of lanthanides(II) supported by the polydentate tris(tertbutoxy) siloxide ligand ([Yb2L4], 1-Yb and [Sm2L4], 1-Sm, (L = (OtBu)3SiO−)) were synthesized in 70–80% yield and 1-Sm was crystallographically characterized. 1-Yb ...

2019

CS2 Reductive Coupling to Acetylenedithiolate by a Dinuclear Ytterbium(II) Complex

Rosario Scopelliti, Marinella Mazzanti, Julie Renée Michelle Andrez, Davide Toniolo

The activation of CS2 is of interest in a broad range of fields and more particularly in the context of creating new C‐C bonds. The reaction of the dinuclear ytterbium(II) complex [Yb2L4], 1, (L = (OtBu)3SiO‐) with carbon disulphide led to the isolation of ...

2019

A complete series of uranium(iv) complexes with terminal hydrochalcogenido (EH) and chalcogenido (E) ligands E = O, S, Se, Te

Marinella Mazzanti

We here report the synthesis and characterization of a complete series of terminal hydrochalcogenido, U–EH, and chalcogenido uranium(IV) complexes, U≡E (with E = O, S, Se, Te), supported by the (Ad,MeArOH)3tacn (1,4,7-tris(3-(1-adamantyl)-5-methyl-2-hydrox ...

2019

The role of bridging ligands in dinitrogen reduction and functionalization by uranium multimetallic complexes

Kay Severin, Marinella Mazzanti, Ivica Zivkovic, Alberto Fabrizio, Farzaneh Fadaei Tirani, Julie Renée Michelle Andrez, Marta Falcone, Luciano Barluzzi

2019

A Factor Two Improvement in High-Field Dynamic Nuclear Polarization from Gd(III) Complexes by Design

Anne-Sophie Chauvin, Marinella Mazzanti, Dominik Józef Kubicki, David Lyndon Emsley, Gabriele Stevanato, Georges Guévork Jean-Jacques Menzildjian

Gadolinium(III) complexes have recently been demonstrated to have potential as polarizing agents for high-field dynamic nuclear polarization (DNP) NMR spectroscopy. By tailoring the ligand design to reduce the zero-field splitting (ZFS), we demonstrate a q ...

2019

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