
Hervé VezinUniversity of Lille · Department of Chemistry
Hervé Vezin
CNRS Research Director
Head of Laboratory LASIRe CNRS UMR8516
About
423
Publications
42,877
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Introduction
Hervé Vezin currently works at the Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRe), Université de Lille. Hervé does research in Spectroscopy, Theoretical Chemistry and Materials Chemistry.
Additional affiliations
January 2015 - December 2018
January 2016 - present
CNRS lille
Position
- Managing Director
October 1999 - present
Education
September 1993 - September 1996
Université Pierre et Marie Curie
Field of study
September 1991 - July 1992
Université Pierre et Marie Curie
Field of study
January 1990 - July 1991
Université Pierre et Marie Curie
Field of study
Publications
Publications (423)
The evolution of soil organic carbon (SOC) stocks is critical for both food production and climate change mitigation. This study uses; advanced electron paramagnetic resonance (EPR) spectroscopy to investigate the spatial localisation and characterisation of organic carbon in speleothems, with a particular focus on methodological advances in recent...
A comprehensive description of halide perovskite degradation is still lacking. Light and temperature are herein combined as stressors to gain novel insights into the involvement of free carriers in the degradation of (FA0.73MA0.27)Pb(I0.945Br0.055)3 and spiro-OMeTAD. In situ EPR spectroscopy is at the core of this study because of its ability to pr...
Usually, the conventional electron paramagnetic resonance (EPR) spectroscopy and imaging use a microwave cavity operating at X-band, i.e. with an excitation frequency of around 9.6 GHz, and remains the most popular mode in the magnetic characterization of lithium batteries to date. We provide here the first low-frequency EPR investigations for moni...
The influence of the support on the performance of Mo nitrides has been investigated in ammonia synthesis and decomposition. A series of Mo–N catalysts supported on different materials, namely SiO2 (commercial, SBA‐15), Al2O3, and CeO2, were prepared. The results indicated that, despite the high dispersion of Mo species in all catalysts, large disp...
The transformation of molecular precursors in the gas phase into nanoparticles in the condensed phase (soot
inception) during combustion has not yet been fully understood. While several hypotheses on soot inception are
currently being examined, their validation requires detailed knowledge of the physical–chemical properties of
the matter first form...
Usually, the conventional electron paramagnetic resonance (EPR) spectroscopy and imaging use a microwave cavity operating at X-band, i.e. with an excitation frequency of around 9.6GHz, and remains the most popular mode in the magnetic characterization of lithium batteries to date. We provide here the first low-frequency EPR investigations for monit...
Ammonia, which is one of the most important chemicals for the
synthesis of dyes, pharmaceuticals, and fertilizers, is produced by the reaction of molecular hydrogen with nitrogen, over an iron-based catalyst at 400−500 °C under pressure of over 100 bar. Decreasing the operating temperature and pressure of this highly energy-intensive process, devel...
The purpose of this study is to prepare Zr-metallosilicates with MFI-type framework via direct hydrothermal approach, by varying Si and Zr precursors. First, a set of routine characterization techniques was applied to confirm the presence of the targeted structure as well as their intrinsic properties. Results suggest the formation of MFI-type mate...
We have investigated metallic lithium particle nucleation following lithiation and delithiation steps of the graphite electrode using X-band electron paramagnetic resonance (EPR). Metallic lithium aggregates like dendrites and/or filaments which are formed during electrochemical cycling on the graphite anode are complex structures which may lead to...
The degradation behaviors of the encapsulant and the imbedded additives significantly determine the reliability of solar modules. Nevertheless, a link between the degradation of the encapsulant, including the additive interactions, and the longevity of the overall module is rarely established until now. Herein, mini‐modules containing ethylene‐viny...
We have investigated the metallic lithium particles nucleation following lithiation and delithiation steps of the graphite electrode using X-band electron paramagnetic resonance (EPR). Metallic lithium aggregates like dendrites and/or filaments which are formed during electrochemical cycling on the graphite anode are complex structures which may le...
Semiconducting polymers provide a ubiquitous platform for a range of applications in molecular electronics and photovoltaics, but the ordered and disordered regions of these materials impart different optoelectronic properties. By resolving local morphology using solid-state magnetic resonance spectros-copy and modeling techniques, here, we demonst...
Strong metal-support interaction (SMSI) is a pivotal strategy in thermal catalysis, while its application in photocatalysis leaves ample area for further development. A method inducing the SMSI between earth-abundant metals,...
Understanding chemical degradation at the interface between different layers in an organic photovoltaic device (OPV) is crucial to improving the long‐term stability of OPVs. Herein, molecular‐level insights are provided into the impact of different metal top electrodes on the interfacial morphology and stability of photoactive layers in PM6:Y6 bulk...
We have investigated the metallic lithium particles nucleation during lithiation and delithiation of the graphite electrode using X-band electron paramagnetic resonance (EPR). Metallic lithium aggregates like dendrites and/or filaments which are formed during electrochemical cycling on the graphite anode are complex structures which may lead to int...
This study explores the electron transfer processes involved after adsorption of N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) within large-pore FAU zeolites. By employing various spectroscopic techniques such as diffuse reflectance UV−vis, EPR, and Raman spectroscopies, we investigated the electron transfer mechanisms after diffusion and ionizat...
Due to their easy conversion into high-added value products, sugar lactones and their derivatives are very attractive biobased platform molecules. Yet, conventional transformation of free sugars into such activated compounds is not so handy: a multistep procedure requiring protection/oxidation/lactonization-esterification/deprotection is often nece...
This work reveals the crucial role of zeolite acidity in the synthesis of zeolite‐templated carbons (ZTCs). While textural and chemical properties appear to be independent from acidity at a given synthesis temperature, the spin concentration in hybrid materials appears to be strongly impacted by the zeolite acid site concentration. The electrical c...
Metal-organic frameworks (MOFs) have been largely investigated worldwide for their use in the capture of radioactive iodine due to its potential release during nuclear accident events and reprocessing of nuclear fuel. The present work deals with the capture of gaseous I2 under a continuous flow and its subsequent transformation into I3- within the...
Among the various alternatives to fossil energies, microalga-based fuels are promising solutions. Thanks to their ability to grow under harsh conditions and trap industrial exhaust gases, these microalgae can help reduce global warming effects. One efficient way to process this feedstock is to use hydrothermal liquefaction (HTL) which leads to an i...
In order to tackle the climate emergency, it is imperative to advance cleaner technologies to reduce pollutant emission as soot particles. However, there is still a lack of complete understanding of the mechanisms responsible for their formation. In this work, we performed an investigation devoted to the study of persistent radicals potentially inv...
Citation: Regnault, R.; Klupsch, F.; El-Bouazzati, H.; Magnez, R.; Le Biannic, R.; Leleu-Chavain, N.; Ahouari, H.; Vezin, H.; Millet, R.; Goossens, J.-F.; et al. Novel PD-L1-Targeted Phenyl-Pyrazolone Derivatives with Antioxidant Properties. Molecules 2023, 28, 3491. Abstract: Orally-active anticancer small molecules targeting the PD-1/PD-L1 immune...
Modulating the interaction between Mo nanoparticles and their support is an elegant approach to finely tune the structural, physico-chemical, redox and electronic properties of the active site. In this work, a series of molybdenum nitride catalysts supported on TiO2, and SBA-15 has been prepared and fully characterized. The results of characterizat...
The first solid-state synthesis of zeolite-templated carbons (ZTCs) is reported using anthracene as the carbon precursor in FAU structured zeolite. The evolution of the anthracene molecule upon sublimation inside of the zeolite micropore system and its further condensation into larger polyaromatic species could be followed by DRUV and Raman spectro...
Modulating the interaction between Mo nanoparticles and their support is an elegant approach to finely tune the structural, physico-chemical, redox and electronic properties of the active site. In this work, a series of molybdenum nitride supported on TiO2, and SBA-15 has been prepared and fully characterized. The results of characterization confir...
The reactivity of 2,3-pyridine-dicarboxylic (known as quinolinic or H2qui) acid and 2,5-pyridine-dicarboxylic (known as isocinchomeronic or H2icc) acid has been investigated as a complexing agent toward the niobium(IV) tetrachloride precursor (NbCl4·2THF) in different organic solvent mixtures. It resulted in the isolation of four crystalline assemb...
Recent electron spin resonance experiments on CaWO $$_4$$ 4 :Gd $$^{3+}$$ 3 + and other magnetic impurities have demonstrated that sustained Rabi oscillations can be created by driving a magnetic moment with a microwave field frequency slightly larger than the Larmor frequency and tuned to the Floquet resonance, together with another microwave fiel...
Recent electron spin resonance experiments on CaWO4:Gd3+ and other magnetic impurities have demonstrated that sustained Rabi oscillations can be created by driving a magnetic moment with a
microwave field frequency slightly larger than the Larmor frequency and tuned to the Floquet resonance, together with another microwave field (image drive) with...
How can the transport of fluids in a confined and complex mixed organic/inorganic matrix be far below the expected value from a topological aspect? A good example of this situation is oil shales. Oil and gas shales are source rocks in which organic matter has matured to form hydrocarbons. They exhibit a dual porous network formed by the intertwinin...
The Two-Partner secretion pathway mediates protein transport across the outer membrane of Gram-negative bacteria. TpsB transporters belong to the Omp85 superfamily, whose members catalyze protein insertion into, or translocation across membranes without external energy sources. They are composed of a transmembrane β barrel preceded by two periplasm...
Major insights into the formation mechanism of zeolite-templated carbons (ZTCs) were achieved via a thorough ex situ kinetic study of the hybrid (carbon/zeolite) and carbon materials. In depth characterization of the chemical, electrical, textural, and morphological properties of the materials allowed us to draw a precise picture of the key steps o...
Ancient Egyptian mummies from the Late Period to the Greco–Roman Period were covered by a black coating consisting of complex and heterogeneous mixtures of conifer resins, wax, fat and oil with variable amounts of bitumen. Natural bitumen always contains traces of vanadyl porphyrin complexes that we used here as internal probes to explore the nanos...
The purpose of this investigation was to determine the nature of radicals present on Natural rubber and poly isoprene system. The qualification and quantification of radicals was made by using Electron Paramagnetic Resonance spectroscopy (EPR). The mechanism of vulcanization has been studied in order to understand the formation of organic radicals....
Many works reported the encapsulation of iodine in metal–organic frameworks as well as the I2 → I3– chemical conversion. This transformation has been examined by adsorbing gaseous iodine on a series of UiO-66 materials and the different Hf/Zr metal ratios (0–100% Hf) were evaluated during the evolution of I2 into I3–. The influence of the hafnium c...
Small TiO 2 contents in the slag-glass significantly reduce their cementitious reactivity. We investigated the role of Ti in the glass network and its influence on slag-glass dissolution. XANES and EPR analysis showed that 67% of Ti was present as Ti(IV) with about 70% in [5] Ti and 30% in [4] Ti coordination, and 33% as Ti(III). The presence of Ti...
Recent electron spin resonance experiments on CaWO$_4$:Gd$^{3+}$ and on other magnetic impurities have demonstrated that sustained Rabi oscillations can be created by driving a magnetic moment with a microwave field frequency slightly larger than the Larmor frequency and tuned to the Floquet resonance together with another microwave field (image dr...
Small molecules targeting the PD-1/PD-L1 checkpoint are actively searched to complement the anticancer arsenal. Different molecular scaffolds have been reported, including phenyl-pyrazolone derivatives which potently inhibit binding of PD-L1 to PD-1. These molecules are structurally close to antioxidant drug edaravone (EDA) used to treat amyotrophi...
Ancient Egyptian mummies from the Late Period to the Greco-Roman period were covered by a black coating consisting in a complex and heterogeneous mixtures of conifer resins, wax, fat and oil with variable amounts of bitumen. Natural bitumen always contains traces of vanadyl porphyrin complexes that we used here as internal probes to explore the nan...
The solid-state organization of hole and electron transporting layers plays an important role in governing the performance and stability of emerging optoelectronic devices such as perovskite solar cells (PSCs). The molecular organic semiconductor (OSC) 2,2″,7,7″-tetrakis [N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) is a promis...
How the transport of fluids in a confined and complex mixed organic/inorganic matrix can be far below the expected value from topological aspect? A good example of this situation is oil shales. Oil and gas shales are source rocks in which organic matter has matured to form hydrocarbons. They exhibit a dual porous network formed by the intertwining...
We investigate the electron spin resonance of the organic spin-Peierls chain (o-DMTTF)2X with X = Cl, Br, and I. We describe the temperature dependence of the spin gap during the phase transition and quantify the dimerization parameter δ. At the lowest temperatures, the susceptibility is governed by defects in the spin dimerized chain. Such strongl...
We investigate the electron spin resonance of the organic spin-Peierls chain (o-DMTTF)2X with X = Cl, Br and I. We describe the temperature dependence of the spin gap during the phase transition and quantify the dimerization parameter $\delta$. At the lowest temperatures, the susceptibility is governed by defects in the spin dimerized chain. Such s...
A series of Zr‐based UiO‐n MOF materials (n=66, 67, 68) have been studied for iodine capture. Gaseous iodine adsorption was collected kinetically from a home‐made set‐up allowing the continuous measurement of iodine content trapped within UiO‐n compounds, with organic functionalities (−H, −CH3, −Cl, −Br, −(OH)2, −NO2, −NH2, (−NH2)2, −CH2 NH2) by in...
Gaseous iodine has been captured by using a series of zirconium‐based UiO‐n metal–organic framework (MOF) sorbents. This study highlights the significant role of amino groups attached to the organic linker, which enhance the iodine uptake capacity, as well as its conversion into anionic iodide I3− species, trapped within UiO‐n cavities. More inform...
Molecular doping strategies facilitate orders of magnitudes enhancements in the charge carrier mobility of organic semiconductors (OSCs). Understanding the mechanisms of different doping strategies for OSCs and molecular-level constraints on...
The Two-Partner secretion pathway mediates protein transport across the outer membrane of Gram-negative bacteria. TpsB transporters belong to the Omp85 superfamily, whose members catalyze protein insertion into, or translocation across membranes without external energy sources. They are composed of a transmembrane beta barrel preceded by two peripl...
Advanced EPR techniques such as ENDOR and pulsed EPR are used to investigate the enigmatic black coatings of ancient Egyptian mummies, consisting in a complex and heterogeneous mixtures of conifer resins, wax, fat and oil with variable amounts of bitumen. Natural bitumen always contains traces of vanadyl porphyrin complexes that we used here as int...
Advanced EPR techniques such as ENDOR and pulsed EPR are used to investigate the enigmatic black coatings of ancient Egyptian mummies, consisting in a complex and heterogeneous mixtures of conifer resins, wax, fat and oil with variable amounts of bitumen. Natural bitumen always contains traces of vanadyl porphyrin complexes that we used here as int...
Expanding the chemical space for designing novel anionic redox materials from oxides to sulfides has enabled to better apprehend fundamental aspects dealing with cationic-anionic relative band positioning. Pursuing with chalcogenides, but deviating from cationic substitution, we here present another twist to our band positioning strategy that relie...
Autoxidation is a set of spontaneous oxygen-mediated radical reactions common to degradation processes of all hydrocarbon-based materials. In this work, EPR (electron paramagnetic resonance) spin-trapping technique was used to study radical species involved in the autoxidation of a sample of synthetic base oil. A sample of polyalphaolefin base oil...
Autoxidation is a set of spontaneous oxygen-mediated radical reactions common to degradation processes of all hydrocarbon-based materials. In this work, EPR (electron paramagnetic resonance) spin-trapping technique was used to study radical species involved in the autoxidation of a sample of synthetic base oil. A sample of polyalphaolefin base oil...
In this study, cobalt sulphide-reduced graphene oxide (CoS-rGO) nanocomposite was prepared by a solvothermal route and its structure, morphology and composition were assessed using various techniques, including transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscop...
Molybdenum dithiocarbamates (MoDTCs) are a class of lubricant additives widely employed in automotives. Most of the studies concerning MoDTC take into account the dimeric structures because of their industrial relevance, with the mononuclear compounds usually neglected, because isolating and characterizing subgroups of MoDTC molecules are generally...
Monitoring the formation of dendrites or filaments of lithium is of paramount importance for Li-based battery technologies, hence the intense activities in designing in situ techniques to visualize their growth. Herein we report the benefit of correlating in situ electron paramagnetic resonance (EPR) spectroscopy and EPR imaging to analyze the morp...
By modifying the stoichiometric ratio of starting materials, two tris(oxalato)chromate(III) salts, (C7H11N2)3[Cr(C2O4)3] (1) and (C5H8N3)2(NH4)[Cr(C2O4)3]·2H2O (2) {(C7H11N2)⁺ = 2-amino-4,6-dimethylpyridinium, (C5H8N3)⁺ = 2,6-diaminopyridinium}, were synthesized and characterized by elemental and thermal analyses, single-crystal X-ray diffraction,...
A-site substituted perovskites were prepared and evaluated for formaldehyde oxidation. Based on the T50, the catalytic activity ranking was: La0.8K0.2MnO3 > La0.8Na0.2MnO3 (LNMO) > La0.8Sr0.2MnO3 > LaMnO3. This improved activity is associated to (i) higher density of surface adsorption sites and (ii) higher bulk oxygen mobility. Stability tests, un...
In the present work, we report the electron transfers occurring after ionization of the guest molecule of t-stilbene incorporated in graphitized HZSM-5 zeolite and we compare these results with the data obtained previously for graphite-free zeolite. Complementary diffuse reflectance UV-vis and Raman scattering spectroscopies provide evidence of sta...
The protection of quantum coherence is essential for building a practical quantum computer able to manipulate, store and read quantum information with a high degree of fidelity. Recently, it has been proposed to increase the operation time of a qubit by means of strong pulses to achieve a dynamical decoupling of the qubit from its environment. We p...
In bioimaging, bioorthogonal chemistry is most often used to visualize chemical reporters by fluorescence in their native environment. Herein, we show that TEMPO-based probes can be ligated to monolignol reporters by Diels-Alder chemistry in plant cell walls, paving the way for the study of lignification by EPR spectroscopy and imaging.
This artic...
Magnetic properties and underlying magnetic models of the synthetic A 2 Cu 3 O(SO 4) 3 fedotovite (A = K) and puninite (A = Na) minerals, as well as the mixed euchlorine-type NaKCu 3 O(SO 4) 3 are reported. We show that all three compounds contain magnetic Cu 6 hexamer units which at temperatures below about 100 K act as single spin-1 entities. Wea...
The paper presents the electron paramagnetic resonance study of defects in the spin chain o −(DMTTF)2Xfamily using continuous wave and pulsed techniques. The defects in spin chains are strongly correlated and present similar microscopic struc- ture as a molecular magnet. By means of 2D-HYSCORE and DFT calculations, we show a strong reduction of hyp...