Article
Engineering, Biomedical
Silvia Stella Ramirez Caballero, Daniel Ferri-Angulo, Romain Debret, Fabien Granier, Sebastien Marie, Francois-Xavier Lefevre, Jean-Michel Bouler, Christelle Despas, Jerome Sohier, Bruno Bujoli
Summary: The study explores combining CPC with organic monomers to form a continuous biocompatible 3D polymeric subnetwork, increasing CPC permeability and accelerating its in vivo degradation. By forming polymers in the CPC microstructure, the size, density, and arrangement of apatite crystals can be manipulated, offering a new route to modulate the microstructure and porosity of apatitic cements.
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
(2021)
Article
Construction & Building Technology
Emmanuel Chailleux, Clemence Queffelec, Ilef Borghol, Fabienne Farcas, Sandrine Marceau, Bruno Bujoli
Summary: This study investigates the physico-chemical properties of bitumen by fractionating it into four fractions and using various experimental methods. The research highlights the importance of different bitumen phases and their interactions within the continuous phase.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Caleb Medena, Corinne Aubert, Etienne Derat, Louis Fensterbank, Geoffrey Gontard, Omar Khaled, Cyril Ollivier, Nicolas Vanthuyne, Marc Petit, Marion Barbazanges
Summary: This study reveals the significant role of a chiral bis-phosphorylated-helical ligand in the palladium-catalyzed Tsuji-Trost allylation. It was found that the (R) and (S) isomeric products can be selectively formed based on the amount of ligand introduced. Analysis through P-31 NMR spectroscopy, X-Ray diffraction, and DFT calculations shed light on the mechanism behind the role of organometallic species involved.
Article
Green & Sustainable Science & Technology
Laura Carolina Cardenas Velandia, Anne Elisabeth Fontaine, Denis Loquet, Ruben Checa, Chantal Lorentz, Bruno Bujoli, Nolven Guilhaume, Christophe Geantet, Emmanuel Chailleux, Clemence Queffelec, Dorothee Laurenti
Summary: The remaining residues of Spirulina can be processed into a biocrude similar to petroleum bitumen through hydrothermal liquefaction. The addition of different catalysts and increasing reaction time can optimize the rheological properties of the biocrude.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Cassandre C. Bories, Marion Barbazanges, Etienne Derat, Marc Petit
Summary: This study describes the use of silyl cobalt (III) dihydride complexes as catalysts for hydrosilylation reactions, which are efficient for a variety of imines with different protecting groups, as well as aliphatic ketimines and quinoline. Kinetic, DFT calculations, NMR spectroscopy, deuteration experiments, and X-ray diffraction analyses were used to propose a catalytic cycle based on silyl dihydrocobalt (III) complexes performing hydrocobaltation.
Article
Polymer Science
Miguel Palenzuela, Kamolchanok Sarisuta, Marta Navarro, Narumi Kumamoto, Nalinthip Chanthaset, Julien Monot, Hiroharu Ajiro, Blanca Martin-Vaca, Didier Bourissou
Summary: 5-Methylene-1,3-dioxane-2-one (exTMC), a cyclic carbonate with an exocyclic methylene group, can be copolymerized with trimethylene carbonate (TMC) using methane sulfonic acid (MSA) as a catalyst, resulting in copolymers with adjustable composition and high randomness. The reactivity ratios of exTMC and TMC were determined to be 0.93-0.95 and 1.04-1.07, respectively. Subsequent thiol-ene reaction on the exomethylene group allows for the preparation of aliphatic polycarbonates with randomly distributed COOH or OH groups along the polymer chains.
Article
Chemistry, Organic
Marc Petit, Cassandre C. Bories, Geoffrey Gontard, Marion Barbazanges, Etienne Derat
Summary: We achieved an efficient regio- and chemoselective dearomatization of N-heteroarenes using hydrido-cobalt catalysts. Mild conditions were employed and the reaction exclusively produced the silyl-1,2-dihydroheteroarenes in a wide range of N-heteroarenes. Quinolines and pyridines with electron-donating and electron-withdrawing substituents were compatible with this methodology. DFT calculations, NMR spectroscopic studies, and X-ray diffraction analysis demonstrated the importance of a second silane for the final step of the reaction.
Article
Chemistry, Multidisciplinary
Enrico Marelli, Julien Monot, Blanca Martin-Vaca, Sonia Mallet-Ladeira, Yago Garcia-Rodeja, Karinne Miqueu, Didier Bourissou
Summary: The coordination of secondary phosphine oxides (SPO) efficiently activates C(sp(2))-I bonds by gold with the addition of a base. This represents a new chelation-assisted oxidative addition reaction. Computational analysis reveals that Au ->(Ar-I) backdonation dominates the oxidative addition, similar to palladium behavior. The reaction produces (P=O,C)-cyclometallated Au(III) complexes, and the SPO moiety at Au(III) can be derivatized through protonation and silylation reactions.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Cassandre Cassiopee Bories, Geoffrey Gontard, Marion Barbazanges, Gilles Lemiere, Marc Petit
Summary: In this study, a mild stereo- and regioselective dearomatization of quinolines using a low-valent HCo(N-2)(PPh3)(3) complex was reported. The authors developed conditions to selectively form high-valued 1,4-bis-borylated tetrahydroquinolines at room temperature from simple starting heteroaromatic compounds. The reaction mechanism involves a cascade pathway, and DFT calculations provided insights into the selectivity of the reaction.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Mario Avila-Gutierrez, Arthur Moisset, Anh-Tu Ngo, Salvatore Costanzo, Guilhem Simon, Philippe Colomban, Marc Petit, Christophe Petit, Isabelle Lisiecki
Summary: This study compares the magnetic properties of core/shell nanoparticles made of cobalt (Co) and cobalt oxide (CoO), and analyzes the variations in their crystalline structure. It is found that the crystalline structure of the core/shell nanoparticle has a significant impact on interfacial magnetic coupling, resulting in exchange bias in Cohcp/CoO particles. The measured exchange bias field (655 mT) exceeds previous reports for similar nanoparticles, and this enhancement is attributed to the high-quality Co/CoO interface, the disparate magnetic anisotropy between the core (Co hcp) and the shell (CoO), and the optimal ratio between the core and shell.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Review
Chemistry, Multidisciplinary
Julien Monot, Enrico Marelli, Blanca Martin-Vaca, Didier Bourissou
Summary: The chemistry of (P,C)-cyclometalated complexes derived from naphthyl phosphines [(Np)(P,C)M] is reviewed and analysed in this paper. The three main synthetic approaches, P-chelation assisted C-H activation, oxidative addition and transmetalation, are described and compared. These complexes exhibit high thermal and chemical robustness, and have been shown to be competent catalysts in various transformations, as well as key intermediates in others.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Engineering, Environmental
Christophe Geantet, Dorothee Laurenti, Nolven Guilhaume, Chantal Lorentz, Ilef Borghol, Bruno Bujoli, Emmanuel Chailleux, Ruben Checa, Sebastien Schramm, Vincent Carre, Frederic Aubriet, Clemence Queffelec
Summary: This study investigates the hydrothermal liquefaction of microalgae-derived feedstocks into a bio-binder, with or without a catalyst. The resulting bio-binder exhibits rheological properties similar to petroleum-derived bitumen. The chemical composition of the bio-binder is analyzed, providing insights into the role of catalysts and the presence of heavy nitrogen compounds in the bio-bitumen.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Crystallography
Arnaud Clerc, Nathalie Saffon-Merceron, Julien Monot, Blanca Martin Vaca, Didier Bourissou
Summary: A new dicationic compound [Pd-2(C32H42N2P2S2)](SbF6)(2)·CH2Cl2 was studied and its crystal structure was determined. The compound exhibits a dimeric structure with two sulfur atoms bridging. The geometry of the Pd2S2 core is butterfly-shaped and has a small Pd···Pd distance. The crystal structure is stabilized by various C-H···F and C-H···π interactions, forming a supramolecular network.
ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Arthur Moisset, Alexandre Sodreau, Anthony Vivien, Caroline Salzemann, Pascal Andreazza, Suzanne Giorgio, Marc Petit, Christophe Petit
Summary: The study proposes a mechanism for the formation of cobalt nanorods, explaining the morphological transition process through dissolution of spherical cobalt nanoparticles and regrowth under an OAm template. Experimental evidence confirms the interdependent reactions occurring during synthesis, with OAm playing crucial roles as a surfactant, disproportionation promoter, and hydrogen source. This coupling of reduction and etching generates two cobalt reservoirs of nuclei under thermodynamic conditions.
Article
Chemistry, Multidisciplinary
Arnaud Clerc, Enrico Marelli, Nicolas Adet, Julien Monot, Blanca Martin-Vaca, Didier Bourissou
Summary: The new catalytic approach combines metal-ligand cooperation and Lewis acid activation to efficiently react with a variety of complex substrates, providing a new solution for the Conia-ene reaction.
