About
24
Publications
4,345
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1,300
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Citations since 2017
Introduction
Research scientist experienced in the chemistry of rare earths, uranium and various transition metals. My current interests are in the coordination and separation chemistry, particularly for the design of novel extracting systems, leading to the development of efficient separation processes for the nuclear fuel cycle and the recovery of strategic elements.
Additional affiliations
July 2013 - present
Position
- Researcher
Description
- Permanent researcher at the Nuclear Energy Division of the CEA working on the development of efficient solvent extraction processes for the nuclear fuel cycle and the separation of strategic elements.
September 2012 - May 2013
Position
- Research and Teaching Associate
Description
- Post-doctoral research in the laboratory of Prof. Marc Fontecave on catalytic systems for carbon dioxide reduction to valuable fuels.
October 2010 - April 2012
Position
- Engineer
Description
- Post-doctoral research in the group of V. Artero on water splitting and catalytic hydrogen production. Developped a very efficient catalytic system by immobilizing molecular cobalt catalysts on the surface of carbon nanotubes.
Education
April 2006 - April 2009
October 2000 - September 2005
Polytechnic University Bucharest
Field of study
- Chemical Engineering
Publications
Publications (24)
The viability of a hydrogen economy depends on the design of efficient catalytic systems based on earth-abundant elements. Innovative breakthroughs for hydrogen evolution based on molecular tetraimine cobalt compounds have appeared in the past decade. Here we show that such a diimine-dioxime cobalt catalyst can be grafted to the surface of a carbon...
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 3...](profile/Renaud-Demadrille/publication/51833365/figure/fig5/AS:333440277860354@1456509765262/UV-absorption-spectra-of-the-complexes-Eupytz-3-NHEt-3-3-and-Eupytzc-3-NHEt-3_Q320.jpg)
Two tridentate pyridine-tetrazolate ligands (H(2)pytz and H(2)pytzc), analogues of the well-known dipicolinate (H(2)dpa) ligand, have been synthesized in a straightforward manner and used for lanthanide(III) coordination. The structures of the resulting tris-ligand complexes were determined in solution ((1)H-NMR), where they remain undissociated, a...
A series of seven new tetrazole-based ligands (L1, L3-L8) containing terpyridine or bipyridine chromophores suited to the formation of luminescent complexes of lanthanides have been synthesized. All ligands were prepared from the respective carbonitriles by thermal cycloaddition of sodium azide. The crystal structures of the homoleptic terpyridine-...
Molecular-engineered bio-inspired catalysts hold promise for the next generation of proton-exchange membrane fuel cells (PEMFCs). Yet, their implementation in catalytic layers with Nafion ionomer faces nanocomposite formulation issues. Here, we use various DuBois nickel catalysts immobilized on carbon nanotubes to exemplify how self-assembly at the...
Rare earth elements (REE) are regarded today as highly critical raw materials but currently lack suitable recycling processes. A combined hydro- and pyrometallurgical process aimed at REE recovery from used NdFeB permanent magnets was recently developed by the CEA. The process integrates the physico-chemical treatment of magnets, followed by a solv...
The design of molecular dyads combining a light-harvesting unit with an electroactive centre is highly demanded in the field of artificial photosynthesis. The versatile Copper-catalyzed Azide-Alkyne Cycloaddition (CuAAC) procedure was employed to assemble a ruthenium tris-diimine unit to an unprecedented azide-substituted copper diimine dioxime moi...
We herein report on a novel, simple and straightforward method for the preparation of nickel bisdiphosphine hydrogen-evolving catalysts, so-called DuBois catalysts, from commercially available nickel hexaaqua salts. This method yields coordination complexes with the same physical characteristics as previously described for compounds prepared from t...
The invention relates to the use of compounds comprising at least one 2-(1H-tetrazol-5-yl)pyridine unit, of formula (I) below:
as ligands for lanthanides and, more especially, as organic chromophores for complexing these elements.
It also relates to lanthanide complexes using these compounds as complexing organic chromophores, and to new compound...
The development of new energy storage technologies is central to solving the challenges facing the widespread use of renewable energies. An option is the reduction of carbon dioxide (CO2) into carbon-based products which can be achieved within an electrochemical cell. Future developments of such processes depend on the availability of cheap and sel...
Cobalt(diimine-dioxime) complexes catalyze hydrogen evolution with low overpotentials and remarkable stability. In this study, DFT calculations were used to investigate their catalytic mechanism, to demonstrate that the initial active state was a Co(I) complex and that H2 was evolved in a heterolytic manner through the protonation of a Co(II) hydr...
A new type of octacoordinated ternary β-diketonates complexes of terbium and europium has been prepared using the anionic tetradentate terpyridine-carboxylate ligand (L) as a sensitizer of lanthanide luminescence in combination with two β-diketonates ligands 2-thenoyltrifluoroacetyl-acetonate (tta(-)) for Eu(3+) and trifluoroacetylacetonate (tfac(-...
A new setup for pump-flow-probe X-ray absorption spectroscopy has been implemented at the SuperXAS beamline of the Swiss Light Source. It allows recording X-ray absorption spectra with a time resolution of tens of microseconds and high detection efficiency for samples with sub-mM concentrations. A continuous wave laser is used for the photoexcitati...
A combined theoretical and experimental approach has been employed to characterize the hydrido-cobaloxime [HCo(dmgH)(2)(PnBu(3))] compound. This complex was originally investigated by Schrauzer et al. [Schrauzer et al., J. Am. Chem. Soc. 1971, 93,1505] and has since been referred to as a key, stable analogue of the hydride intermediate involved in...
The phosphorescent binuclear iridium(III) complexes tetrakis(2-phenylpyridine)μ-(2,2':6',2''-terpyridine-6,6''-dicarboxylic acid)diiridium (Ir1) and tetrakis(2-(2,4-difluorophenyl) pyridine))μ-(2,2':6',2''-terpyridine-6,6''-dicarboxylic acid)diiridium (Ir2) were synthesized in a straightforward manner and characterized using X-ray diffraction, NMR,...
Photosynthesis has been for many years a fascinating source of inspiration for the development of model systems able to achieve efficient light-to-chemical energetic transduction. This field of research, called "artificial photosynthesis," is currently the subject of intense interest, driven by the aim of converting solar energy into the carbon-fre...
Enantiopure undecagold clusters protected by chiral atropisomeric diphosphine ligands (P^P) have been synthesized by the stoichiometric reduction of the corresponding (P^P)(AuCl)(2) complexes with NaBH(4). The molecular mono-disperse [Au(11)(P^P)(4)Cl(2)]Cl species have been thoroughly characterized using an array of analytical techniques. (31)P NM...
Luminescent lanthanide complexes are receiving a large interest for their applications in the field of optoelectronics, as a result of their pure colors and high emission efficiencies. However, the development of new lanthanide chelates for optoelectronic devices has lagged behind that of other applications, and only a limited number of architectur...
Les complexes luminescents de lanthanides font l'objet d'une recherche importante dans le domaine de l'opto-électronique du fait de couleur pure et de rendements quantiques importants. Le développement de nouveaux chelates spécifiquement adaptés pour des applications opto-électroniques reste cependant un domaine moins développé par rapport à d'autr...
Tetrazolate groups have been included by a convenient synthetic route in diverse ligand topologies, which have allowed the incorporation of lanthanide ions into highly luminescent double- and triple-helical complexes, demonstrating their potential for the expansion of lanthanide chemistry and the development of lanthanide-based applications.
Silver-tin mediated allylations of several carbonylic compounds are presented. The reactions show better yields compared to other mediation systems, such as those based on Sn and/or stannous salts. Chemoselectivity of the silver-tin mediating system is much similar to that offered by other Barbier systems. Optimization of the process was also attem...
A rapid method for the obtaining of breakthrough curves (BC) and the determination of their specific parameters for p-chloraniline (PCA) and p-nitrophenol (PNP) is described by on-line solid phase extraction (SPE) cartridges. A series of experiments were performed to obtain the BC at different concentrations of solute (0.8 ÷ 4 mg/L) and varying the...
Projects
Projects (2)
The aim of the project is to develop a sustainable and complete extraction process for REE from secondary sources. This will help to ensure that the supply of REE will be available in the future. The project results will be brought to the end user represented by different industries from different parts of Europe and also third countries via dissemination, networking and market uptake efforts. For more information: www.enviree.eu
