16 results on '"Rémi Plamont"'
Search Results
2. Run-and-halt motility of droplets in response to light
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Alexander Ryabchun, Dhanya Babu, Jacopo Movilli, Rémi Plamont, Marc C.A. Stuart, Nathalie Katsonis, Synthetic Organic Chemistry, Molecular Active Systems, Electron Microscopy, and Stratingh Institute of Chemistry more...
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General Chemical Engineering ,Biochemistry (medical) ,Materials Chemistry ,Environmental Chemistry ,General Chemistry ,Biochemistry - Abstract
Microscopic motility is a property that emerges from systems of interacting molecules. Unraveling the mechanisms underlying such motion requires coupling the chemistry of molecules with physical processes that operate at larger length scales. Here, we show that photoactive micelles composed of molecular switches gate the autonomous motion of oil droplets in water. These micelles switch from large trans-micelles to smaller cis-micelles in response to light, and only the trans-micelles are effective fuel for the motion. Ultimately, it is this light that controls the movement of the droplets via the photochemistry of the molecules composing the micelles used as fuel. Notably, the droplets evolve positive photokinetic movement, and in patchy light environments, they preferentially move toward peripheral areas as a result of the difference in illumination conditions at the periphery. Our findings demonstrate that engineering the interplay between molecular photo-chemistry and microscopic motility allows designing motile systems rationally. more...
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- 2022
Catalog
3. Reactive mesogens for ultraviolet-transparent liquid crystal polymer networks
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Federico Lancia, Alexander Ryabchun, Rémi Plamont, Molecular Active Systems, Molecular Inorganic Chemistry, and Biomolecular Nanotechnology
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reactive mesogens ,Materials science ,010405 organic chemistry ,business.industry ,Liquid crystals ,UT-Hybrid-D ,Liquid crystal elastomer ,02 engineering and technology ,General Chemistry ,liquid crystal polymer networks ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,medicine.disease_cause ,01 natural sciences ,0104 chemical sciences ,liquid crystal elastomers ,Liquid crystal ,medicine ,UV transparent ,Optoelectronics ,General Materials Science ,0210 nano-technology ,business ,Ultraviolet - Abstract
Transparency and stability to UV light are important and desirable properties for modern tunable optical elements and active soft robots. A library of novel reactive mesogens for liquid crystal polymer networks resilient and transparent to UV light has been synthetised and characterised. Phase behaviours of the reactive mesogens have been determined by polarised optical microscopy and differential scanning calorimetry. Liquid crystal polymer networks based on the combination of these novel reactive mesogens have been evaluated and compared to those based on common commercially available compounds. The results showed a twofold increase in transparency in a broad UV spectral region (200–400 nm) and importantly showed no degradation upon prolonged UV exposure contrary to the networks composed from commercial counterparts. more...
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- 2020
4. Run-and-Halt Behavior of Motile Droplets in Response to Light
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Alexander Ryabchun, Dhanya Babu, Nathalie Katsonis, Jacopo Movilli, Rémi Plamont, Molecular Active Systems, and Synthetic Organic Chemistry
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Molecular switch ,endocrine system ,Aqueous solution ,Materials science ,Liquid crystal ,Oil droplet ,Biophysics ,technology, industry, and agriculture ,Self-assembly ,complex mixtures ,eye diseases ,Visible spectrum - Abstract
We report the run-and-halt behavior of motile droplets immersed in an aqueous solution of amphiphilic molecular switch. These oil droplets move autonomously as the switch solubilizes the oil into the water. Droplet movement stops in response to UV light, and picks up again in response to visible light. This motile behavior is a consequence of the reversible trans-to-cis photo-conversion of the switch in water, because the trans photo-isomer stabilizes the oil droplets better than the cis photo-isomer, and therefore it also solubilizes the droplet more effectively. Notably, the droplets also evolve positive photokinesis under illumination with visible light, and, in patchy light environments, their complex motility pattern directs the droplets at the periphery of the illuminated areas. more...
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- 2021
5. Building responsive materials by assembling {Fe4Co4} switchable molecular cubes
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Rodrigue Lescouëzec, Damien Dambournet, Olaf J. Borkiewicz, Yanling Li, Juan-Ramón Jiménez, Alexandrine Flambard, Laurent Lisnard, Laure Catala, Jana Glatz, Antoine Tissot, Rémi Plamont, Lise-Marie Chamoreau, Amina Benchohra, Marie-Laure Boillot, Qui Pham Xuan, Institut Parisien de Chimie Moléculaire (IPCM), Chimie Moléculaire de Paris Centre (FR 2769), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), PHysicochimie des Electrolytes et Nanosystèmes InterfaciauX (PHENIX), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Réseau sur le stockage électrochimique de l'énergie (RS2E), Université de Nantes (UN)-Aix Marseille Université (AMU)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Université de Picardie Jules Verne (UPJV)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA), Argonne National Laboratory [Lemont] (ANL), Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Institut de Chimie du CNRS (INC)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux Poreux de Paris (IMAP ), Département de Chimie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université de Picardie Jules Verne (UPJV)-Institut de Chimie du CNRS (INC)-Aix Marseille Université (AMU)-Université de Pau et des Pays de l'Adour (UPPA)-Université de Nantes (UN)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Collège de France (CdF (institution))-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA)-Université Grenoble Alpes (UGA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), and Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) more...
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Materials science ,Molecular model ,010405 organic chemistry ,Ligand ,Precipitation (chemistry) ,General Chemistry ,[CHIM.MATE]Chemical Sciences/Material chemistry ,[CHIM.INOR]Chemical Sciences/Inorganic chemistry ,010402 general chemistry ,Scorpionate ligand ,01 natural sciences ,0104 chemical sciences ,Electron transfer ,Paramagnetism ,Chemical engineering ,Materials Chemistry ,Cube - Abstract
International audience; Responsive materials that can answer to chemical or physical external stimuli offer numerous prospects in material science. Here, we have elaborated a two-step synthetic approach that allows incorporating molecular cubic switches into a polymeric material. Firstly, a preformed half-capped, Cs+-templated {Fe4Co4} cyanido-polymetallic cubic unit (“pro-cube”) is obtained and proven to be stable in solution, as demonstrated by paramagnetic NMR. Secondly, the reaction of the pro-cube with a ditopic scorpionate ligand enables the precipitation of a polymeric network containing the cubic unit. Furthermore, the adequately chosen ditopic ligand that coordinates the Co ions of the pro-cube allows us to preserve the switchable properties of the cubic unit. Indeed, the magnetic properties of the polymeric material compare well with those of the molecular cubic model that is obtained by reacting a non-bridging scorpionate ligand, and that was prepared as a reference. Both the polymeric material and the molecular model cube show a thermally-induced metal–metal electron transfer near room temperature. Interestingly, the magnetic state of the polymeric material is shown to depend on its hydration state, indicating its capability to act as a chemo-sensor. more...
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- 2021
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6. Highly Selective Syn Addition of 1,3-Diones to Internal Ynamides Catalyzed by Zinc Iodide
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Rémi Plamont, Lionel V. Graux, and Hervé Clavier
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010405 organic chemistry ,Chemistry ,Organic Chemistry ,Regioselectivity ,Homogeneous catalysis ,010402 general chemistry ,01 natural sciences ,Combinatorial chemistry ,0104 chemical sciences ,Adduct ,chemistry.chemical_compound ,Syn and anti addition ,Nucleophile ,Zinc iodide ,Lewis acids and bases ,Physical and Theoretical Chemistry ,Hydroalkoxylation - Abstract
Having previously established that 1,3-diones could be used as nucleophiles to perform additions to ynamides, highly selective hydroalkoxylation of internal ynamides is now described herein. Several catalytic systems were compared to carry out this transformation including transition metal-based catalysts or Lewis acids. ZnI2 was found to be both very active and highly selective giving only E adducts through a syn addition. Scope and limits investigation showed that this catalyst was compatible with various functional groups. In addition to 17 examples of ynamide hydroalkoxylation, one example of ynamide hydroarylation is reported. more...
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- 2018
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7. Edge-On Self-Assembly of Tetra-bromoanthracenyl-porphyrin on Silver Surfaces
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Joffrey Pijeat, Sylvain Clair, Rémi Plamont, Nataliya Kalashnyk, Teodor Silviu Balaban, Michel Daher Mansour, Laurence Masson, Stéphane Campidelli, Xavier Bouju, Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Innovation en Chimie des Surfaces et NanoSciences (LICSEN UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre d'élaboration de matériaux et d'études structurales (CEMES), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut de Chimie de Toulouse (ICT), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0003,IPS,Idex Paris-Saclay(2011), ANR-16-CE29-0027,MAGMA,Propriétés Magnétiques du Graphène Fonctionnalisé par des Assemblages Moléculaires Bidimensionnels(2016), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Laboratoire Innovation en Chimie des Surfaces et NanoSciences (LICSEN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie de Toulouse (ICT-FR 2599), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut de Chimie du CNRS (INC)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut de Chimie du CNRS (INC)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Aix Marseille Université (AMU), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie de Toulouse (ICT-FR 2599), Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut de Recherche pour le Développement (IRD)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), ANR-11-IDEX-0003-02/10-LABX-0035,Nano-Saclay,Paris-Saclay multidisciplinary Nano-Lab(2011), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), and ANR-11-IDEX-0003,IPS,Paris-Saclay multidisciplinary Nano-Lab(2011) more...
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Materials science ,Supramolecular chemistry ,Substrate (electronics) ,010402 general chemistry ,01 natural sciences ,law.invention ,chemistry.chemical_compound ,law ,Perpendicular ,Molecule ,Physical and Theoretical Chemistry ,010405 organic chemistry ,Intermolecular force ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Porphyrin ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,Crystallography ,General Energy ,chemistry ,[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] ,Self-assembly ,[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] ,Scanning tunneling microscope - Abstract
International audience; Molecular self-assembly on surfaces is driven by the range of interactions between the molecules themselves and the substrate. Generally, a face-on structure is favored for aromatic molecules lying flat on the surface. Here, we report on the supramolecular self-assembly of 5,10,15,20-tetrakis(10-bromoanthracen-9-yl)porphyrin on the Ag(111) and Ag(110) surfaces. Wellordered molecular chains were observed by room-temperature scanning tunneling microscopy on both surfaces. The relatively small size of the unit cell revealed an edge-on configuration of the porphyrin macrocycles, that is, perpendicular to the surface plane, as confirmed by molecular mechanics calculations. Distinct intermolecular interactions were found on the two surfaces, providing different molecular chain orientations on Ag(111) and Ag(110). more...
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- 2020
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8. Azobenzene as Light-Activable Carrier Density Switches in Nanocrystals
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Hervé Cruguel, Sandrine Ithurria, Xiang Zhen Xu, Nicolas Goubet, Charlie Gréboval, Junling Qu, Audrey Chu, Prachi Rastogi, Mathieu G. Silly, Clément Livache, Emmanuel Lhuillier, Rémi Plamont, Yoann Prado, Bertille Martinez, Physico-chimie et dynamique des surfaces (INSP-E6), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), University of Twente [Netherlands], Laboratoire de Physique et d'Etude des Matériaux (UMR 8213) (LPEM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), De la Molécule aux Nanos-objets : Réactivité, Interactions et Spectroscopies (MONARIS), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ANR-18-CE30-0023,IPER-Nano2,Nanocristaux de perovskite inorganique pour la nanophotonique(2018), ANR-11-IDEX-0004,SUPER,Sorbonne Universités à Paris pour l'Enseignement et la Recherche(2011), ANR-19-CE24-0022,COPIN,Détecteur plasmonique à nanoCristaux colloïdaux: une nouvelle filière pour l'OPtoélectronique INfrarouge(2019), ANR-19-CE09-0026,GRaSkop,Tuning Giant Rashba Spin-Orbit Coupling in Polar Single Layer Transition Metal Dichalcogenides(2019), ANR-19-CE09-0017,FRONTAL,Nanocristaux Colloïdaux Dopés Infrarouges(2019), European Project: 756225,blackQD, Biomolecular Nanotechnology, and University of Twente more...
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Materials science ,business.industry ,02 engineering and technology ,[CHIM.MATE]Chemical Sciences/Material chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,n/a OA procedure ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Optical pumping ,Dipole ,General Energy ,Nanocrystal ,Impurity ,Optoelectronics ,Molecule ,Physical and Theoretical Chemistry ,[PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] ,0210 nano-technology ,business ,Excitation ,Cis–trans isomerism ,Visible spectrum - Abstract
International audience; Control of carrier density in colloidal quantum dots is a major challenge for their integration into optoelectronic devices. Several chemical methods have been proposed to reach this goal including: introduction of impurities, non-stoichiometric compounds, introduction of redox molecules as ligands and surface gating obtained by tuning the dipole associated with surface ligands. None of these techniques allows post synthesis tunability. Alternatively, optical pumping requires high excitation power which may heat and finally damage the sample. Here, we propose a new procedure based on grafting of azobenzenes (AZBs) on the nanocrystal surface. The AZBs have two conformations (cis and trans), which are associated with strongly different dipole moments. The transition from one conformation to the other can be activated using UV or visible light at low intensities ( more...
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- 2019
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9. Dynamic Spirals of Nanoparticles in Light-Responsive Polygonal Fields
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Alexis Depauw, Nathalie Katsonis, Rémi Plamont, Tetiana Orlova, and Biomolecular Nanotechnology
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Materials science ,Physics::Medical Physics ,Nanoparticle ,chirality ,Physics::Optics ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Nanomaterials ,Biomaterials ,Liquid crystal ,General Materials Science ,Soft matter ,molecular switches ,Plasmon ,Molecular switch ,General Chemistry ,self-assembly ,021001 nanoscience & nanotechnology ,n/a OA procedure ,0104 chemical sciences ,Condensed Matter::Soft Condensed Matter ,Colloidal gold ,smart materials ,nanoparticles ,Self-assembly ,0210 nano-technology ,Biotechnology - Abstract
Nanoparticles tend to aggregate in an uncontrollable fashion once integrated into soft matter and consequently, self-assembling nanoparticles into large-scale, regular, well-defined patterns remains an ongoing challenge towards the design and realization of smart hybrid materials. The patterns of nanoparticles that have been reported in liquid crystals are static so far, and this lack of responsiveness extends to assemblies of nanoparticles formed in topological singularities and other localized structures of anisotropic matter. Here, we demonstrate the realization of light-responsive spirals of gold nanoparticles, by using a templating strategy that is common in the biological world. Specifically, we use polygonal fields of liquid crystals that incorporate molecular photo-switches in their composition, as light-responsive chiral templates. We also show that light modifies the period of the dynamic spirals of nanoparticles. These results confirm that using chiral liquid crystals as dynamic templates constitutes a versatile strategy towards soft photonic nanomaterials, and we anticipate that the possibility to control the period of the nanoparticulated pattern can find potential applications in the field of plasmonic sensing. more...
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- 2019
10. Straightforward Syntheses That Avoid Scrambling of meso -Substituted [28]Hexaphyrins
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Teodor Silviu Balaban, Gabriel Canard, and Rémi Plamont
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Acid concentration ,Aqueous medium ,010405 organic chemistry ,Aryl ,Organic Chemistry ,Nanotechnology ,010402 general chemistry ,01 natural sciences ,Combinatorial chemistry ,3. Good health ,0104 chemical sciences ,Scrambling ,chemistry.chemical_compound ,chemistry ,Group (periodic table) ,Physical and Theoretical Chemistry - Abstract
A two-step synthesis of meso-substituted [28]hexa-phyrins in an aqueous medium was developed and optimized, and scrambling processes are avoided despite the use of a high acid concentration. The efficiency of this procedure relies on the nature of the starting material, and it can be extended to the straightforward preparation of unprecedented AB2C2D-[28]hexaphyrins bearing up to four different kinds of meso-appended aryl group. more...
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- 2017
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11. A soluble cyanide-bridged {Fe 4 Ni 4 } box encapsulating a Cs + ion: synthesis, structure and electronic properties
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Amina Benchohra, Yanling Li, Jessica L. Tami, Omar Khaled, Rodrigue Lescouëzec, Rémi Plamont, Juan-Ramón Jiménez, Geoffrey Gontard, Institut Parisien de Chimie Moléculaire (IPCM), Chimie Moléculaire de Paris Centre (FR 2769), Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) more...
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010405 organic chemistry ,Cyanide ,electronic communication ,chemistry.chemical_element ,Nuclear magnetic resonance spectroscopy ,caesium ,molecular cage ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Ion ,Supramolecular assembly ,Crystallography ,Paramagnetism ,chemistry.chemical_compound ,chemistry ,Caesium ,Materials Chemistry ,Proton NMR ,[CHIM]Chemical Sciences ,cyanide ligand ,Physical and Theoretical Chemistry ,Cyclic voltammetry - Abstract
Cyanide coordination clusters have received attention for their electronic and magnetic properties. Here, we synthesized a new octametallic cyanide box encapsulating a Cs+. The cationic complex Cs⊂[FeIII4(Tp)4NiII4(NMe2Tp)4(μ-CN)12]+ was crystallized as a BF4− salt and its structure reveals that the cesium ion interacts with the twelve cyanide edges. These interactions are likely responsible for the remarkable stability of the supramolecular assembly, which maintains its integrity in solution, as shown by NMR spectroscopy, mass spectrometry, and cyclic voltammetry experiments. The 1H NMR spectrum of 1 shows well-resolved signals, which are strongly shifted due to the paramagnetic nature of the cage. The encapsulated caesium ion is also affected by the paramagnetic cage and shows a strongly shifted 133Cs paramagnetic NMR signal. The {Fe4Ni4} box shows remarkable redox flexibility with five accessible oxidation states, which correspond to the reversible oxidation/reduction of the four FeIII/FeII ions. The separation of the four consecutive redox waves accounts for the occurrence of an efficient electronic communication between the metal ions through the cyanide bridges. The cyanide bridges are also efficient in transmitting a ferromagnetic interaction between the iron and nickel ions as shown by the magnetic properties. more...
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- 2018
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12. Nanoscopic Imaging ofmeso-Tetraalkylporphyrins Prepared in High Yields Enabled by Montmorrilonite K10 and 3 Å Molecular Sieves
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Michel Giorgi, Christian Roussel, Teodor Silviu Balaban, Mayuko Takahashi, Yoshihiro Kikkawa, Masatoshi Kanesato, Anita Chan Kam Shun, and Rémi Plamont
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Chemistry ,Organic Chemistry ,General Chemistry ,Crystal structure ,Molecular sieve ,Catalysis ,Solvent ,Chemical engineering ,Highly oriented pyrolytic graphite ,Organic chemistry ,Graphite ,Self-assembly ,Nanoscopic scale - Abstract
We have developed a high-yielding synthesis of meso-tetraalkylporphyrins, which previously have been obtained only in lower yields. By employing Montmorrilonite K10 as the acid catalyst and 3 Å molecular sieves as the dehydrating agent, yields that reached 70 % could be achieved with some aliphatic aldehydes. The free-base porphyrins with decyl (C10) or longer chains were imaged at the single-molecule level at the solvent/surface interface. Highly oriented pyrolytic graphite (HOPG) was used as a π-stacking surface, whereas 1-phenyloctane and 1-phenylnonane were used as solvents. An odd-even effect was observed from C13 to C16. For C13 a single-crystal X-ray structure allowed an unprecedented insight into how packing from two dimensions is expanded into a three-dimensional crystal lattice. more...
- Published
- 2013
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13. An Efficient Synthesis of Porphyrins with Different meso Substituents that Avoids Scrambling in Aqueous Media
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Agnieszka Nowak-Król, Daniel T. Gryko, Judicaelle Andeme Edzang, Teodor Silviu Balaban, Rémi Plamont, Gabriel Canard, Institute of Organic Chemistry, Polish Academy of Sciences (PAN), Institut des Sciences Moléculaires de Marseille (ISM2), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) more...
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Green chemistry ,Porphyrins ,Nitrile ,synthesis ,(non)scrambling porphyrins ,porphyrinoids ,Aldehyde ,Catalysis ,Scrambling ,chemistry.chemical_compound ,Benzoquinones ,Organic chemistry ,Pyrroles ,chemistry.chemical_classification ,Aldehydes ,Aqueous medium ,green chemistry ,[CHIM.ORGA]Chemical Sciences/Organic chemistry ,Aryl ,Organic Chemistry ,Condensation ,Water ,Green Chemistry Technology ,General Chemistry ,Porphyrin ,chemistry ,π-extension ,Oxidation-Reduction - Abstract
International audience; We have developed new conditions that afford regioisomerically pure trans-A(2)B(2)-, A(3)B-, and trans-AB(2)C-porphyrins bearing aryl and arylethynyl substituents. The porphyrins were prepared by the acid-catalyzed condensation of dipyrromethanes with aldehydes followed by oxidation with p-chloranil or 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). Optimal conditions for the condensation were identified after examining various reaction parameters such as solvent composition, acid concentration, and reaction time. The conditions identified (for aromatic aldehydes: EtOH/H2O 4:1, [DPM]=4 mm, [aldehyde] = 4 mm, [HCl] = 38 mm, 16 h; for arylethynyl aldehydes: THF/H2O 2:1, [DPM] = 13 mm, [aldehyde] = 13 mm, [HCl] = 150 mm, 3 h) resulted in the formation of porphyrins in yields of 9-38% without detectable scrambling. This synthesis is compatible with diverse functionalities such as ester or nitrile. In total, 20 new trans-A(2)B(2)-, A(3)B-, and trans-AB(2)C-porphyrins were prepared. The scope and limitations of the two sets of reaction conditions have been explored. The methodological advantage of this approach is its straightforward access to building blocks and the formation of the porphyrin core in higher yields than by any other methodology and by using environmentally benign and nonhazardous chemicals. more...
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- 2015
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14. Inside Cover: An Efficient Synthesis of Porphyrins with DifferentmesoSubstituents that Avoids Scrambling in Aqueous Media (Chem. Eur. J. 4/2015)
- Author
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Teodor Silviu Balaban, Judicaelle Andeme Edzang, Rémi Plamont, Agnieszka Nowak-Król, Gabriel Canard, and Daniel T. Gryko
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Green chemistry ,Aqueous medium ,Chemistry ,Organic Chemistry ,Organic chemistry ,Cover (algebra) ,General Chemistry ,Catalysis ,Scrambling - Published
- 2015
- Full Text
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15. Cover Picture: Bare Histidine-Serine Models: Implication and Impact of Hydrogen Bonding on Nucleophilicity / Nanoscopic Imaging of meso-Tetraalkylporphyrins Prepared in High Yields Enabled by Montmorrilonite K10 and 3 Å Molecular Sieves (Chem. Eur. J. 34
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Rémy Fortrie, Christian Roussel, Mayuko Takahashi, Rémi Plamont, Innocenzo de Riggi, Julien Leclaire, Messaoud Mazari, Teodor Silviu Balaban, Olivier Thillaye du Boullay, Yoshihiro Kikkawa, Didier Bourissou, Gérard Buono, Yuan Zhang, Frédéric Fotiadu, Michel Giorgi, Blanca Martin-Vaca, Masatoshi Kanesato, Anita Chan Kam Shun, and Colin Bonduelle more...
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Serine ,Nucleophile ,Computational chemistry ,Chemistry ,Hydrogen bond ,Organic Chemistry ,General Chemistry ,Nuclear magnetic resonance spectroscopy ,Self-assembly ,Molecular sieve ,Nanoscopic scale ,Catalysis ,Histidine - Published
- 2013
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16. Efficient synthesis of meso-tetraalkyl porphyrin and their nanoscopic investigation: 2D or 3D self-assemblies
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Rémi Plamont, Kikkawa, Yoshihiro, Takahashi, Mayuko, Kanesato, Masatoshi, Giorgi, Michel, Roussel, Christian, and Balaban, Teodor Silviu
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