A5046062081- Glass properties and applications
- Phase-change materials and chalcogenides
- Solid-state spectroscopy and crystallography
- Advanced NMR Techniques and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Perovskite Materials and Applications
- Inorganic Chemistry and Materials
- Material Dynamics and Properties
- Crystal Structures and Properties
- Polyoxometalates: Synthesis and Applications
- Magnetism in coordination complexes
- NMR spectroscopy and applications
- Catalysis and Oxidation Reactions
- Bone Tissue Engineering Materials
- Quasicrystal Structures and Properties
- Lanthanide and Transition Metal Complexes
- Mineralogy and Gemology Studies
- Dental Implant Techniques and Outcomes
- Nanocluster Synthesis and Applications
- Luminescence Properties of Advanced Materials
- Organoboron and organosilicon chemistry
- Metal-Organic Frameworks: Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Boron Compounds in Chemistry
Institut des Sciences Chimiques de Rennes
2014-2024
Université de Rennes
2015-2024
Centre National de la Recherche Scientifique
2015-2024
Institut d'Électronique et des Technologies du numéRique
2023
Institut National des Sciences Appliquées de Rennes
2019-2022
École Nationale Supérieure de Chimie de Rennes
2013-2022
Conditions Extrêmes et Matériaux Haute Température et Irradiation
2007-2019
Université d'Orléans
2011-2019
Czech Academy of Sciences
2019
Czech Academy of Sciences, Institute of Physics
2019
Physical properties of chalcogenide glasses in the ${\text{As}}_{x}{\text{Se}}_{1\ensuremath{-}x}$ system have been measured as a function composition including Young's modulus $E$, shear $G$, bulk $K$, Poisson's ratio $\ensuremath{\nu}$, density $\ensuremath{\rho}$, and glass transition ${T}_{\text{g}}$. All these exhibit relatively sharp extremum at average coordination number $⟨r⟩=2.4$. The structural origin this trend is investigated by Raman spectroscopy nuclear magnetic resonance. It...
Reactions in solvothermal conditions between hexanuclear rare earth complexes and H2bdc, where H2bdc symbolizes terephthalic acid, lead to a family of monodimensional coordination polymers which act as metallic nodes. The cores can be either homometallic with general chemical formula [Ln6O(OH)8(NO3)6]2+ (Ln = Pr–Lu plus Y) or heterometallic [Ln6xLn′6–6xO(OH)8(NO3)6]2+ Ln′ Y). Whatever the entity is, resulting polymer is iso-structural [Y6O(OH)8(NO3)2(bdc)(Hbdc)2·2NO3·H2bdc]∞, that we have...
We report on 207Pb, 79Br, 14N, 1H, 13C and 2H NMR experiments for studying the local order dynamics in hybrid perovskite lattices. 207Pb conducted at room temperature a series of MAPbX3 compounds (MA = CH3NH3+; X Cl, Br I) showed that isotropic shift is strongly dependent nature halogen ions. Therefore appears to be very promising tool characterisation mixed perovskites. MAPbBr2I served as proof concept. Proton, 14N confirmed results previously reported literature. Low deuterium...
Tremendous enhancement of optical emission efficiency was achieved in fluorosilicate glasses by growing lanthanide doped fluoride nanocrystals embedded oxide glass matrix. The formation mechanism the microstructure elucidated combining solid-state NMR, scanning TEM, EDX map, and large-scale molecular dynamics simulations. results reveal that growth originated from phase separation. Atomic level structures separation fluoride-rich regions oxyfluoride matrix were observed both maps MD...
The straightforward synthesis of a new Cu(i) metal-rich small metallacycle is presented. This compound luminescent in the solid state with an emission quantum yield 72% at room temperature and displays pronounced reversible red-shift its spectra upon cooling. Quantum chemical calculations reveal that these properties are governed by important geometrical relaxations imply formation cuprophilic interactions excited states.
Isostructural lanthanide-based coordination polymers that are obtained by reactions in water of a lanthanide chloride and the sodium salt 5-methoxyisophthalate (mip2–) have general chemical formula [Ln2(mip)3(H2O)8·4H2O]∞ with Ln = Nd–Er except Pm plus Y (symbolized [Ln2(mip)3]∞). Some these homo-lanthanide compounds present very high luminescence brightness. The weak intermetallic energy transfer between ions observed allows design hetero-lanthanide tunable properties. A molecular alloy...
In the context of nanomedicine, liposils (liposomes and silica) have a strong potential for drug storage release schemes: such materials combine intrinsic properties liposome (encapsulation) silica (increased rigidity, protective coating, pH degradability). this work, an original approach combining solid state NMR, molecular dynamics, first principles geometry optimization, NMR parameters calculation allows building precise representation organic/inorganic interface in liposils....
Functional silica nanoparticles and in particular luminescent constitute very promising candidates for many applications the field of biotechnology, theranostics, photonics. However, optimizing design such materials requires a deep understanding their physicochemical properties. In this article are reported extended investigations on Cs2[Mo6Br14]@SiO2 prepared by water-in-oil microemulsion technique. We bring here new insights into structure its interplay with optical The structural...
A series of physical properties have been measured throughout and above the glass transition for whole As${}_{x}$Se${}_{1\ensuremath{-}x}$ system, including activation viscous flow ${E}_{\ensuremath{\eta}}$, energy enthalpy relaxation ${E}_{H}$, structural ${E}_{a}$ obtained by specific heat spectroscopy. All show a double minimum at an average coordination number $\ensuremath{\langle}r\ensuremath{\rangle}$ $=$ 2.3 2.5 with local maximum 2.4. This is in stark contrast to previously on same...
The solventless reaction of diisopropylaminoborane with n-butylamine, at room temperature, leads to a mixture B(sp2) H-, B(sp3) H2 -, and H3 -containing species. At low the outcome is completely modified, thus leading selectively formation high-mass polybutylaminoborane. When extended variety primary amines, under conditions this provides new, efficient, direct metal-free access high-molecular-mass polyaminoboranes in good high yields mild conditions.
We describe a new supramolecular approach combining host-guest and electrostatic interactions to design hybrid materials containing polyanionic bulky inorganic compounds showing liquid crystalline properties.
Hybrid nanomaterials made of inorganic nanocomponents dispersed in an organic host raise increasing interest as low-cost solution-processable functional materials. However, preventing phase segregation while allowing a high doping content remains major challenge, and usual methods require functionalization step prior integration. Herein, we report new approach to design such nanocomposite which ceramic-like metallic nanocluster compounds are embedded at 10 wt % copolymers, without any...
Under specific conditions, mixing two oppositely charged proteins induces liquid-liquid phase separation. The denser phase, or coacervate can be potentially applied as a system to protect encapsulate different bioactive molecules with broad range of food and/or medical applications. optimization the design and efficiency such systems requires precise understanding structure equilibrium nanocomplexes formed within coacervate. Here, we report on dynamics coacervates by well-known,...
Complexation affinity of laurate ligands (C12H23O2) grafted onto the surface cerium(IV) oxide nanoparticles can be probed and quantified in situ, by pulsed field gradient 1H NMR through dependence diffusion coefficient on size a species.
Replacing pure inorganic materials by functional organic-inorganic hybrid ones to lower production costs has become a major challenge, in particular for the optoelectronic industry. Adding nanostructuration abilities meanwhile preserving homogeneity is even more challenging this class of new materials. Here we show that red-NIR emissive ternary molybdenum cluster salts can be assembled liquid crystalline 15C5 crown ethers. The resulting hybrids are homogeneous and stable up high temperature...
Abstract Two new supramolecular fluorescent hybrid materials, combining for the first time [M 6 O 19 ] 2− (M=Mo, W) polyoxometalates (POMs) and aggregation‐induced emission (AIE)‐active 1‐methyl‐1,2,3,4,5‐pentaphenyl‐phospholium ( 1 + ), were successfully synthesized. This novel molecular self‐assembling strategy allows designing efficient solid‐state emitters, such as (1) 2 [W , by directing favorably balance between AIE aggregation‐caused quenching (ACQ) effects using both anion‐π...