A5038363749- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Asymmetric Hydrogenation and Catalysis
- Organometallic Complex Synthesis and Catalysis
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- Catalytic Cross-Coupling Reactions
- Crystallography and molecular interactions
- Organoboron and organosilicon chemistry
- Microbial Natural Products and Biosynthesis
- Dendrimers and Hyperbranched Polymers
- Advanced NMR Techniques and Applications
- ZnO doping and properties
- Metal complexes synthesis and properties
- Catalytic Processes in Materials Science
- Chemical Synthesis and Characterization
- Nanocluster Synthesis and Applications
- Alzheimer's disease research and treatments
- Bone Tissue Engineering Materials
- Magnetism in coordination complexes
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced biosensing and bioanalysis techniques
- Advanced Photocatalysis Techniques
- Advancements in Battery Materials
Laboratoire de Chimie de Coordination
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Université de Toulouse
2015-2025
Institut National Polytechnique de Toulouse
2013-2024
Université Toulouse III - Paul Sabatier
2014-2024
University of Puerto Rico at Carolina
2016-2020
Main Roads Western Australia
2017
Softmat - Chimie des colloïdes, polymères & assemblages complexes
2003-2016
École Normale Supérieure de Kouba
2010
Laboratoire de Physique et Chimie des Nano-Objets
2010
Advanced (1)H, (13)C, and (31)P solution solid-state NMR studies combined with IR spectroscopy were used to probe, at the molecular scale, composition surface chemistry of indium phosphide (InP) quantum dots (QDs) prepared via a non-coordinating solvent strategy. This nanomaterial can be described as core-multishell object: an InP core, zinc blende bulk structure, is surrounded first by partially oxidized shell, which itself organic coating. passivating layer composed, in coordination...
Iron has been implicated in Alzheimer's disease, but until now no direct proof of FeII binding to the amyloid-β peptide (Aβ) reported. We used NMR evidence coordination full-length Aβ40 and truncated Aβ16 peptides at physiological pH show that site is located first 16 amino-acid residues. caused selective broadening some peaks was dependent on Fe:Aβ stoichiometry temperature. Analysis effect 1H, 13C, 2D data established Asp1, Glu3, three His, not Tyr10 nor Met35 are residues mainly involved...
Indium phosphide colloidal quantum dots (QDs) are emerging as an efficient cadmium-free alternative for optoelectronic applications. Recently, syntheses based on easy-to-implement aminophosphine precursors have been developed. We show by solid-state nuclear magnetic resonance spectroscopy that this new approach allows oxide-free indium core or core/shell to be made. Importantly, the interface does not help in achieving higher luminescence efficiencies. demonstrate case of InP/ZnS and...
Hybrid polyionic complexes (HPICs) are colloidal structures with a charged core rich in metal ions and neutral hydrophilic corona. Their properties, whether as reservoirs or catalysts, depend on the accessibility environment of ions. This study demonstrates that modifying coordination sphere these can tune properties HPICs by altering composition complexing block varying formulation conditions. Hence, double copolymers were synthesized using RAFT polymerization, polyethylene glycol different...
Gallant exchange: Upon coordination of phosphanyl gallane ligands to AuCl, both neutral and zwitterionic complexes coexist. NMR spectroscopy provides direct evidence for the transfer chloride between gold gallium in diphosphanyl gallane. The introduction a third buttress allows separation structural characterization two isomers (see picture; Au yellow, P red, Cl green, Ga blue).
Complexes [Fe9(X)2-(O2CMe)8{(2-py)2CO2}4] (X(-)=OH(-) (1), N3(-) (2), and NCO(-) (3)) have been prepared by a route previously employed for the synthesis of analogous Co(9) Ni(9) complexes, involving hydroxide substitution pseudohalides (N3(-), NCO(-)). As indicated DC magnetic susceptibility measurements, this induced higher ferromagnetic couplings in complexes 2 3, leading to ground spin states compared that 1. Variable-field experiments shown state is not well isolated from excited...
Abstract The syntheses of a series phosphonic acid‐capped dendrimers is described. This collection based on unique set dendritic structural parameters—cyclo(triphosphazene) core, benzylhydrazone branches and acid surface—and was designed to study the influence phosphonate (phosphonic acid) surface loading towards activation human monocytes ex vivo. Starting from versatile hexachloro‐cyclo(triphosphazene) N 3 P Cl 6 , six first‐generation were obtained, bearing one full branches, that lead 4,...
Abstract Full NMR characterization of ZnO nanoparticles (NPs) stabilized by various amines (hexadecylamine, dodecylamine, and octylamine) in C 7 D 8 demonstrated that the surface this apparently simple system was very complex. Using different spectroscopic techniques ( 1 H, PGSE‐NMR, diffusion‐filtered H NMR, NOESY, ROESY), we observed at least three modes interaction NPs, thermodynamic equilibrium with free amines, relative populations which varied their concentration. The first mode...
The peroxide function of artemisinin has been activated by iron(II)-heme generated in situ from iron(III)-protoporphyrin-IX and glutathione, a biologically relevant reductant. In mild conditions, this reaction produced high yield (85%) heme derivatives alkylated at α-, β-, δ-meso positions C4-centered radical derived artemisinin.
The behavior of a fifth generation phosphorus dendrimer having hydrophobic interior and hydrophilic end groups is studied in solution water using the pulsed-field gradient spin-echo NMR technique. Addition THF to this induces dramatic changes concerning size (+150% volume), T1 relaxation THF, viscosity. This behaves like highly singular nanotool, able both modify its environment be modified by it.
Brief encounter. ZnII- and CuII-induced aggregation of the peptide amyloid-β (Aβ) are considered to be involved in Alzheimer's disease. The present data indicate that ZnII CuII transiently form a monomeric complex with Aβ40/42 before aggregation, which exhibits no further stable intermediate up ∼15-mer.
Bisphosphonates (BPs) are well established as successful antiresorptive agents for the prevention and treatment of bone diseases such osteoporosis Paget's disease. The aim this work was to clarify reaction mechanisms between a BP molecule, tiludronate, nanocrystalline apatite surface. adsorption tiludronate on well-characterized synthetic biomimetic apatites with homogeneous but different compositions surface characteristics investigated determine effect substrate behavior. results show that...
Although TiO2, ZrO2, and HfO2 nanocrystals are often synthesized in tri-n-octylphosphine oxide (TOPO), it is unclear whether TOPO also serves as ligand. Using liquid solid state 1H 31P nuclear magnetic resonance spectroscopy X-ray fluorescence spectroscopy, we show that the nanocrystal surface capped by several derivatives of TOPO. In NMR spectrum, di-n-octylphosphinate (δ = 57 ppm) P,P′-(di-n-octyl) pyrophosphonate 20 found coordinated to nanocrystal. addition, hydrogen chloride associates...
The heteroleptic coordination scenario of silver(I) with various phenanthroline ligands (NN) and different bis-phosphine (PP) derivatives has been investigated. In addition to the X-ray crystal structural characterization resulting mixed ligand Ag(I) complexes, detailed NMR studies have performed disclose behavior prepared complexes in solution. results obtained also systematically related one for copper(I) same combination PP NN ligands. Starting from an equimolar mixture AgBF4,...
Abstract The reactivity of two classes ruthenium nanoparticles (Ru NPs) small size, either sterically stabilized by a polymer (polyvinylpyrrolidone, PVP) or electronically ligand (bisdiphenylphosphinobutane, dppb) was tested towards standard reactions, namely CO oxidation, 2 reduction and styrene hydrogenation. aim the work to identify sites on study how presence ancillary ligands can influence course these catalytic reactions using NMR IR spectroscopies. It found that oxidation proceeds at...
Pt NPs covered with zwitterionic amidinates as ligands exhibit an exciting ligand effect in the hydrogenation of carbonyl groups when electron donor/acceptor are introduced the<italic>N</italic>-substituents.
We report the dramatic impact of addition N-heterocyclic carbenes (NHCs) on reactivity and selectivity heterogeneous Ru catalysts in context C-H activation reactions. Using a simple robust method, we prepared series new air-stable starting from commercially available carbon (Ru/C) differently substituted NHCs. Associated with deuteration processes, depending Ru/C-NHC ratios, chemical outcome can be controlled to large extent. Indeed, tuning catalyst NHC enabled: 1) increased chemoselectivity...