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Anne-Sophie Chauvin

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Publications associées (46)

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Design Principles for the Development of Gd(III) Polarizing Agents for Magic Angle Spinning Dynamic Nuclear Polarization

David Lyndon Emsley, Marinella Mazzanti, Anne-Sophie Chauvin, Gabriele Stevanato, Yu Rao, Amrit Venkatesh, Chad Thomas Palumbo, Megan Renee Keener

Nuclear magnetic resonance suffers from an intrinsically low sensitivity, which can be overcome by dynamic nuclear polarization (DNP). Gd(III) complexes are attractive exogenous polarizing agents for magic angle spinning (MAS) DNP due to their high chemica ...

2022

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

Rosario Scopelliti, Marinella Mazzanti, Anne-Sophie Chauvin, 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

Synthesis of octa(1,1,3,3-tetramethylbutyl)octakis (dimethylphosphinoylmethyleneoxy)calix[8]arene and its application in the synergistic solvent extraction and separation of lanthanoids

Anne-Sophie Chauvin

A new lower rim substituted calix[8]arene bearing eight phosphine oxide moieties has been synthesized. The structure of 5,11,17,23,29,35,41,47-octa(1,1,3,3-tetramethylbutyl)-49,50,51,52,53,54,55,56-octakis(dimethylphosphinoylmethyleneoxy)calix[8]arene (S) ...

Elsevier2008

Autoxidation of a 4-iminoimidazolidin-2-one with a tertiary 5-hydrogen to its 5-hydroxy derivative

Anne-Sophie Chauvin

Chemoselective autoxidation of 4-imino-1,5-dimethyl-3-(4-nitrophenyl) imidazolidin-2-one (1b) to its 5-hydroxy derivative 2 occurred in solutions of DMSO-d(6), acetonitrile-d(3) or refluxing ethanol. Also bis(imidazolidin-5-yl) peroxide 5 was isolated as a ...

2008

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

David Lyndon Emsley, Marinella Mazzanti, Anne-Sophie Chauvin, Dominik Józef Kubicki, Gabriele Stevanato

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

Gd3+-Functionalized Lithium Niobate Nanoparticles for Dual Multiphoton and Magnetic Resonance Bioimaging

Marinella Mazzanti, Sandrine Gerber, Anne-Sophie Chauvin, Luigi Bonacina, Katarzyna Pierzchala, Ileana Ozana Jelescu, Jérémy Vuilleumier, Raphaël Jovita De Matos, Laura Camille Louise Nicolle, Adrian Stefan Gheata, Dario Diviani

Harmonic nanoparticles (HNPs) have emerged as appealing exogenous probes for optical bioimaging due to their distinctive features such as long-term photostability and spectral flexibility, allowing multiphoton excitation in the classical (NIR-I) and extend ...

2022

Self-Assembled Nanomicelles as MRI Blood-Pool Contrast Agent

Lothar Helm, Anne-Sophie Chauvin

Gadolinium‐loaded nanomicelles show promise as future magnetic resonance imaging (MRI) contrast agents (CAs). Their increased size and high gadolinium (Gd) loading gives them an edge in proton relaxivity over smaller molecular Gd‐complexes. Their size and ...

2017

Structure, reactivity and luminescence studies of triphenylsiloxide complexes of tetravalent lanthanides

Jean-Claude Bünzli, Marinella Mazzanti, Farzaneh Fadaei Tirani, Anne-Sophie Chauvin, Aurélien René Willauer

Among the 14 lanthanide elements (Ce-Lu), until recently, the tetravalent oxidation state was readily accessible in solution only for cerium while Pr(iv), Nd(iv), Dy(iv) and Tb(iv) had only been detected in the solid state. The triphenylsiloxide ligand rec ...

2022

Lighting-up cancerous cells and tissues with lanthanide luminescence

Martinus Adela Maria Gijs, Jean-Claude Bünzli, Caroline Vandevyver, Anne-Sophie Chauvin, Hans-Anton Lehr

2011

Multiphoton-Excited Luminescent Lanthanide Bioprobes: Two- and Three-Photon Cross Sections of Dipicolinate Derivatives and Binuclear Helicates

Majed Chergui, Jean-Claude Bünzli, Frank van Mourik, Andrea Cannizzo, Anne-Sophie Chauvin, Bo Song, Svetlana Eliseeva, Gerald Auböck

Multiphoton excited luminescent properties of water-soluble EuIII and TbIII complexes with derivatives of dipicolinic acid functionalized with a polyoxyethylene pendant arm and terminal groups, [Eu(LOMe)3]3-, [Eu(LNH2)3]3-, and [Tb(LOH)3]3-, as well as of ...

2010

Exploring the potential of europium(III) luminescence for the detection of phase transitions in ionic liquid crystals

Jean-Claude Bünzli, Anne-Sophie Chauvin, Frédéric Gumy

The ionic liquid crystal [C12-mim]Cl has been doped with 5 mol% europium nitrate and the photophysical properties of both the ionic liquid and the trivalent europium ion have been monitored with respect to temperature in the range of 248 to +120 uC. The re ...

Royal Society of Chemistry2007

Uranium(IV) and Thorium(IV) Coordination Polymers Based on Tritopic Carboxylic Acids

Rosario Scopelliti, Marinella Mazzanti, Farzaneh Fadaei Tirani, Wendy Lee Queen, Anne-Sophie Chauvin, Till Marian Schertenleib, Aurélien René Willauer, Andrei Andreichenko

Rigidtritopic linkers of different sizes were used to buildporous U-(IV) and Th-(IV) 3D frameworks. The charge of the polymerscould be tuned by reaction conditions such as the temperature, pH,solvent, ligand, or metal precursor, yielding a series of neutra ...

AMER CHEMICAL SOC2023

Lanthanide Complexes with a Calix[8]arene Bearing Phosphinoyl Pendant Arms

Jean-Claude Bünzli, Anne-Sophie Chauvin

The phosphinoyl-substituted macrocyclic receptor B8bL8, derived from p-tert-butylcalix[8]arene, was synthesized and its structure was studied in solution. According to temperaturedependent 1H and 31P NMR spectroscopic data, the calix[8]arene adopts a so-ca ...

2007

A Polyoxyethylene-Substituted Bimetallic Europium Helicate for Luminescent Staining of Living Cells

Jean-Claude Bünzli, Caroline Vandevyver, Anne-Sophie Chauvin, Steve Comby, Bo Song

The homoditopic ligand

H_2L^{C3}

has been designed to form neutral triple-stranded bimetallic helicates of overall composition [

Ln_2(L^{C3})_3

]. The grafting of the polyoxyethylene fragments ensures water solubility and also favors cell penetration whi ...

2007

Luminescent Lanthanide Helicates Self-Assembled from Ditopic Ligands Bearing Phosphonic Acid or Phosphoester Units

Jean-Claude Bünzli, Anne-Sophie Chauvin, Steve Comby, Cyntia De Piano

A series of hexadentate ditopic receptors incorporating benzimidazole moieties have been designed, which are fitted with phosphonic acid or phosphoethylester coordinating units. In addition, poly(oxyethylene) pendants have been introduced on the benzimidaz ...

2009

Time-resolved luminescence microscopy of bimetallic lanthanide helicates in living cells

Jean-Claude Bünzli, Caroline Vandevyver, Anne-Sophie Chauvin, Bo Song

The cellular uptake mechanism and intracellular distribution of emissive lanthanide helicates have been elucidated by time-resolved luminescence microscopy (TRLM). The helicates are non-cytotoxic and taken up by normal (HaCat) and cancer (HeLa, MCF-7) cell ...

2008

Multielectron Redox Chemistry of Uranium by Accessing the plus II Oxidation State and Enabling Reduction to a U(I) Synthon

Rosario Scopelliti, Marinella Mazzanti, Ivica Zivkovic, Anne-Sophie Chauvin, Megan Renee Keener, Maxime Christian Gérard Tricoire

Thesynthesis of molecular uranium complexes in oxidation stateslower than +3 remains a challenge despite the interest for their multielectrontransfer reactivity and electronic structures. Herein, we report theone- and two-electron reduction of a U(III) com ...

2023

Fluorinated β-Diketones for the Extraction of Lanthanide Ions: Photophysical Properties and Hydration Numbers of Their EuIII Complexes

Jean-Claude Bünzli, Anne-Sophie Chauvin, Frédéric Gumy

Tris(β-diketonato)europium(III) with a series of variably fluorinated ligands derived from 3,5-heptanedione were synthesised with the aim of determining their hydration state under extraction conditions. The number of coordinated water molecules was determ ...

2006

New sensitizers for dye-sensitized solar cells featuring a carbon-bridged phenylenevinylene

Michael Graetzel, Anne-Sophie Chauvin, Aswani Yella

We demonstrate that a carbon-bridged phenylenevinylene (CPV)-linked dye serves as a novel and efficient sensitizer for dye-sensitized solar cells. The cells show IPCE values of greater than 90%, PCEs of up to 7.12%, and high open circuit voltages reaching ...

Royal Society of Chemistry2013

Carbazole as Linker for Dinuclear Gadolinium-Based MRI Contrast Agents

Lothar Helm, Anne-Sophie Chauvin, Loïck Moriggi, Bibimaryam Mousavi

Ligands able to complex two gadolinium ions have been synthesized and characterized in view of the ability of the complexes to increase the spin relaxation of water protons. All ligands are based on the heptadentate diethylenetriaminetetraacetic acid (DTTA ...

Wiley-V C H Verlag Gmbh2017