A5060677392- Advanced NMR Techniques and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Asymmetric Hydrogenation and Catalysis
- Solid-state spectroscopy and crystallography
- Electron Spin Resonance Studies
- Atomic and Subatomic Physics Research
- Organometallic Complex Synthesis and Catalysis
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Chemical Synthesis and Analysis
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Covalent Organic Framework Applications
- Perovskite Materials and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Organic Electronics and Photovoltaics
- Chemical Reactions and Isotopes
- Advanced Battery Materials and Technologies
- Crystallography and molecular interactions
- Magnetic properties of thin films
- DNA and Nucleic Acid Chemistry
- Crystallography and Radiation Phenomena
- Magnetism in coordination complexes
- Catalytic Cross-Coupling Reactions
- Synthetic Organic Chemistry Methods
New York University
2024-2025
New York University Abu Dhabi
2024-2025
Centre National de la Recherche Scientifique
2019-2023
École Normale Supérieure de Lyon
2019-2023
Université Claude Bernard Lyon 1
2019-2023
Centrale Marseille
2023
Forum Réfugiés - Cosi
2020
TinyPol binitroxides provide significantly higher DNP enhancement factors for solid-state NMR spectroscopy at high magnetic fields than today's reference radical AMPUPol.
The development of efficient adsorbent materials capable dual capture carbon dioxide (CO2) and iodine is great importance due to the significant contribution anthropogenic CO2 climate change potential risks associated with nuclear energy sources, such as release radioactive during waste processing accidents. In this study, two nitrogen-rich tetraphenylethylene-functionalized porous organic polymers were prepared via a Schiff-base condensation reaction between...
A novel heterobimetallic tantalum/iridium hydrido complex, [{Ta(CH2tBu)3}{IrH2(Cp*)}] 1, featuring a very short metal-metal bond, has been isolated through an original alkane elimination route from Ta(CHtBu)(CH2tBu)3 and Cp*IrH4. This molecular precursor used to synthesize well-defined silica-supported low-coordinate species [≡SiOTa(CH2tBu)2{IrH2(Cp*)}], 5, [≡SiOTa(CH2tBu)H{IrH2(Cp*)}], 6, using surface organometallic chemistry (SOMC) approach. The SOMC methodology prevents undesired...
Heteronuclear decoupling is an essential element in the solid-state magic-angle spinning (MAS) Dynamic nuclear polarization (DNP) experiments involving low gamma (γ) nuclei like 13C and 15N coupled to protons. Under constraints of limited (< 100 kHz) maximum radio frequency (RF) amplitude intermediate (30-45 frequencies, imposed by cryogenic DNP setup, typically utilized heteronuclear schemes TPPM SPINAL-64 suffer from near rotary-resonance recoupling (R3). Here, we demonstrate...
The structural characterization of supported molecular catalysts is challenging due to the low density active sites and presence several organic/organometallic surface groups resulting from often complex chemistry associated with support functionalization. Here, we provide a complete atomic-scale description all in an N-heterocyclic carbene based on iridium silica, at stages its synthesis. By combining suitable isotope labeling strategy implementation multinuclear dipolar recoupling...
Dynamic nuclear polarization (DNP) has emerged as a transformative technique for enhancing the sensitivity of magnetic resonance (NMR) signals, playing crucial role in solid-state NMR spectroscopy and imaging applications. This review outlines fundamental principles DNP its applications across various materials, which have yielded remarkable insights advancements field. However, employment stable paramagnetic centers traditional introduces several challenges, such relaxation, spin diffusion...
N-Heterocyclic carbenes (NHCs) are widely used ligands in transition metal catalysis. Notably, they increasingly encountered heterogeneous systems. While a detailed knowledge of the possibly multiple environments would be essential to understand activity metal-NHC-based catalysts, only few techniques currently have ability describe with atomic-resolution structures dispersed on solid support. Here, we introduce new dynamic nuclear polarization (DNP) surface-enhanced solid-state magnetic...
The study introduces a new mechanism of nuclear spin diffusion in the context Dynamic Nuclear Polarization (DNP) with magic angle spinning (MAS) under high magnetic fields. Electron-electron ($e$-$e$) coupling interactions, particularly electron flip-flop interaction, play significant role enhancing DNP polarizing agents substantial hyperfine couplings. Using four-spin system model, both theoretical analysis and numerical simulations suggest that $e-e$ interactions eliminate barrier...
The addition of aluminum-based adjuvants in vaccines enhances the immune response to antigens. strength antigen adsorption on adjuvant gels is known modulate vaccine efficacy. However, a detailed understanding mechanisms interaction between aluminum and antigens still missing. Herein, new analytical approach based dynamic nuclear polarization (DNP) enhanced NMR spectroscopy under magic angle spinning (MAS) implemented provide molecular description antigen-adjuvant interface. This...
Dynamic nuclear polarization can improve the sensitivity of magic-angle spinning solid-state NMR experiments by 1-2 orders magnitude. In aqueous media, are usually performed using so-called DNP juice, a glycerol-d8/D2O/H2O mixture (60/30/10, v/v/v) that form homogeneous glass at cryogenic temperatures. This acts as cryoprotectant and prevents phase separation paramagnetic polarizing agents (PAs) added to provide source electron spin required for DNP. Here, we show relatively high 1H...
The study introduces a new mechanism of nuclear spin diffusion in the context Dynamic Nuclear Polarization (DNP) with magic angle spinning (MAS) under high magnetic fields. Electron-electron ($e$-$e$) coupling interactions, particularly electron flip-flop interaction, play significant role enhancing DNP polarizing agents substantial hyperfine couplings. Using four-spin system model, both theoretical analysis and numerical simulations suggest that $e-e$ interactions eliminate barrier...
Abstract Over the past decade, halogenated semiconducting polymers have attracted considerable interest due to their outstanding optoelectronic properties. Thus, in most of today's organic photovoltaic devices benchmark semiconductors are materials, either electron donor or non‐fullerene acceptor (NFA) small molecules. However, nature and position substituted halogen atoms impact, through self‐assembly modification, properties a way that is difficult predict. Yet, solid‐state self‐assembling...
The catalytic activity of multifunctional microporous materials is directly linked to the spatial arrangement their struc-tural building blocks. Despite great achievements in design and use isolated sites within such materials, precise determination atomic-level structure local environment still remains a fundamental chal-lenge, especially when they are hosted non-crystalline solids. Here, we show that by combining NMR measurements with pair distribution function (PDF) analysis computational...