A5067020727- Astrophysics and Star Formation Studies
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Spectroscopy and Quantum Chemical Studies
- Photochemistry and Electron Transfer Studies
- Advanced Photocatalysis Techniques
- Advanced Combustion Engine Technologies
- Spectroscopy and Laser Applications
- Mass Spectrometry Techniques and Applications
- Porphyrin and Phthalocyanine Chemistry
- Atmospheric Ozone and Climate
- CO2 Reduction Techniques and Catalysts
- Fullerene Chemistry and Applications
- Stellar, planetary, and galactic studies
- Catalytic Processes in Materials Science
- Molecular Junctions and Nanostructures
- Luminescence and Fluorescent Materials
- Planetary Science and Exploration
- Photoreceptor and optogenetics research
- Quantum, superfluid, helium dynamics
- Polyoxometalates: Synthesis and Applications
- Combustion and flame dynamics
- Atmospheric chemistry and aerosols
Institut des Sciences Moléculaires d'Orsay
2015-2025
Université Paris-Saclay
2015-2025
Centre National de la Recherche Scientifique
2015-2025
Université Paris-Sud
2010-2020
Centre Hospitalier d'Orsay
2019
Osservatorio Astronomico di Cagliari
2014
University of Basel
2001-2010
The University of Sydney
2009
Université Claude Bernard Lyon 1
2009
Laboratoire de Spectrométrie Ionique et Moléculaire
2009
The Keggin-type polyoxometalate (POM) PW12O403– and the catalytic complex Cp*Rh(bpydc)Cl2 (bpydc = 2,2′-bipyridine-5,5′-dicarboxylic acid) were coimmobilized in Zr(IV) based metal organic framework UiO-67. POM is encapsulated within cavities of MOF by situ synthesis, then, Rh introduced postsynthetic linker exchange. Infrared Raman spectroscopies, 31P 13C MAS NMR, N2 adsorption isotherms, X-ray diffraction indicate structural integrity all components (POM, Rh-complex MOF) composite interest...
Abstract Graphdiyne (GDY), which features a highly π‐conjugated structure, direct bandgap, and high charge carrier mobility, presents the major requirements for photocatalysis. Up to now, all photocatalytic studies are performed without paying too much attention on GDY bandgap (1.1 eV at G 0 W many‐body theory level). Such narrow is not suitable band alignment between other semiconductors, making it difficult achieve efficient photogenerated separation. Herein, first time, demonstrated that...
Iron porphyrins are among the best molecular catalysts for electrocatalytic CO2 reduction reaction. Powering these with help of photosensitizers comes along a couple unsolved challenges that need to be addressed much vigor. We have designed an iron porphyrin catalyst decorated urea functions (UrFe) acting as multipoint hydrogen bonding scaffold towards substrate. found spectacular photocatalytic activity reaching unreported TONs and TOFs high 7270 3720 h-1 , respectively. While Fe0 redox...
Abstract Downsizing the graphdiyne (GDY) network to shape quantum dots (QDs) will provide attractive optical and electronic properties associated with confinement edge effects. Here, it is demonstrated that defect introduction allow using GDY in donor–acceptor photocatalytic systems for solar‐to‐hydrogen conversion. The defect‐rich QDs (GDYO‐QDs) exhibit a blue‐to‐green excitation‐dependent photoluminescence behavior, demonstrating their ability harvest light over wide energy range....
Context. The infrared emission features observed in the mid-infrared wavelength range astronomical objects, often called Aromatic Infrared Bands, exhibit differences shape and position. Three astrophysical spectral classes have been proposed based on characteristics. band positions most sources are similar to those of aromatic materials, however, exact nature emitters is still unknown.
Context. A 3.4 μm absorption band (around 2900 cm-1), assigned to aliphatic C-H stretching modes of hydrogenated amorphous carbons (a-C:H), is widely observed in the diffuse interstellar medium, but disappears or modified dense clouds. This spectral difference between different phases medium reflects processing dust environments. Cosmic ray bombardment one processes that make carbonaceous evolve.
Context. Carbonaceous cosmic dust is observed through infrared spectroscopy either in absorption or emission. The details of the spectral features are believed to shed some light on its structure and finally enable study life cycle.
P2W18Co4@MOF-545, which contains the sandwich-type polyoxometalate (POM) [(PW9O34)2Co4(H2O)2]10- (P2W18Co4) immobilized in porphyrinic metal-organic framework (MOF), MOF-545, is a "three-in-one" (porosity + light capture catalysis) heterogeneous photosystem for oxygen-evolution reaction (OER). Thin films of this composite were synthesized on transparent and conductive indium tin oxide (ITO) supports using electrophoretic (EP) or drop-casting (DC) methods, thus providing easy-to-use devices....
A unique polyoxometalate complex made up of a tetradecanuclear nickel bisphosphonate cluster capping {SiW9} unit has been characterized. This stable compound exhibits high hydrogen evolution reaction photocatalytic activity under visible light irradiation via reductive quenching mechanism.
With a direct band gap, superior charge carrier mobility, and uniformly distributed pores, graphdiyne (GDY) has stimulated tremendous interest from the scientific community. However, its broad application is greatly limited by complicated multistep synthesis process including complex deprotection of hexakis-[(trimethylsilyl)ethynyl]benzene (HEB-TMS) peeling GDY substrates. Here, we describe deprotection-free strategy to prepare powder directly using HEB-TMS as monomer. When CuCl was used...
We analyze dust features present in the mid-infrared (Spitzer) and recently published L-band (UKIRT) spectra of infrared galaxy IRAS 08572+3915. The line sight toward AGN nucleus crosses a high column density carbonaceous whose characteristic absorption appear clearly. They provide real insight into chemical environment diffuse interstellar medium. Thanks to moderate redshift 08572+3915, wavelength aromatic CH stretching mode is free major telluric lines, strong observational constraint H/H...
Context. Cosmic ray ion irradiation affects the chemical composition of and triggers physical changes in interstellar ice mantles space. One primary structural induced is loss porosity, evolve toward a more compact amorphous state. Previously, compaction was monitored at low to moderate energies. The existence threshold stopping power has been suggested.
We report the first experimental measurement of near-threshold photo-ionization spectra polycyclic aromatic hydrocarbon clusters made pyrene C16H10 and coronene C24H12, obtained using imaging photoelectron photoion coincidence spectrometry with a VUV synchrotron beamline. The results ionization energy are confronted to calculated ones from simulations dedicated electronic structure treatment for large ionized molecular clusters. Experiment theory consistently find decrease cluster size....
The intense Σu+1←X1Σg+ electronic transition of the chains HC2nH (n=8–13) has been recorded in gas phase using resonant two color photon ionization spectroscopy. frequencies lie ∼1300 cm−1 to blue values a neon matrix. These polyynes appear be linear both ground and excited state and, as for polyynes, spectral theoretical evidence large bond alternation is found indicating localized π orbitals on C≡C units. species are longest carbon observed spectroscopically up now.
The electronic absorption spectrum of the naphthalene cation has been obtained in conditions relevant for comparison with diffuse interstellar bands astrophysics, i.e., cold species gas phase. novel technique consisting to photodissociate a selectively R2P2CI-prepared PAH–argon van der Waals complex molecular beam [Ph. Bréchignac and T. Pino, Astron. Astrophys. 343, L49 (1999)] used. various aspects method are described detail. whole visible range explored revealing two transitions...
Biomimetic models that contain elements of photosynthesis are fundamental in the development synthetic systems can use sunlight to produce fuel. The critical task consists running several rounds light-induced charge separation, which is required accumulate enough redox equivalents at catalytic sites for target chemistry occur. Long-lived first charge-separated state and distinct electronic signatures sequential accumulated species essential features be able track these events on a...
In this work, online spontaneous Raman spectroscopy was applied to study the soot inception and growth zones of a low pressure premixed ethylene/oxygen flame. Firstly, we measured spectrum aerosol extracted from The compared ex situ measurements same after being deposited on window. particles, presence an abundant sp hybridized carbon chain component is inferred accompanying polycyclic aromatic component. Both cumulenic polyynic chains are affected by deposition under vacuum as it raised...
The B 3Σu−←X 3Σg− transitions of HC13H and HC19H have been measured in the gas phase, exhibiting broad, Lorentzian shaped bands. More extensive A spectra observed for HC2n+1H (n=3–6) than before with many new vibronic bands identified. were obtained by means a mass selective resonant two-color two-photon ionization technique coupled to supersonic plasma source. electronic structures this series molecules (n=2–9) both ground excited states investigated using DFT, MP2, state-averaged CASSCF...
Polycyclic aromatic hydrocarbons (PAHs) are key species encountered in a large variety of environments such as the Interstellar Medium (ISM) and combustion media. Their UV spectroscopy photodynamics neutral cationic forms important to investigate order learn about their structure, formation mechanisms, reactivity. Here, we report an experimental photoelectron-photoion coincidence study prototypical PAH molecule, coronene, its small clusters, molecular beam using vacuum ultraviolet (VUV)...