A5078984037- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Surface and Thin Film Phenomena
- Force Microscopy Techniques and Applications
- Metal complexes synthesis and properties
- Graphene research and applications
- Organometallic Complex Synthesis and Catalysis
- Advanced Chemical Physics Studies
- Synthesis and Properties of Aromatic Compounds
- Porphyrin and Phthalocyanine Chemistry
- Magnetism in coordination complexes
- Fullerene Chemistry and Applications
- Quantum and electron transport phenomena
- Mechanical and Optical Resonators
- Organic Electronics and Photovoltaics
- Carbon Nanotubes in Composites
- Lanthanide and Transition Metal Complexes
- Covalent Organic Framework Applications
- X-ray Diffraction in Crystallography
- Photochemistry and Electron Transfer Studies
- Crystallization and Solubility Studies
- Inorganic and Organometallic Chemistry
- Asymmetric Hydrogenation and Catalysis
- Crystal structures of chemical compounds
- Spectroscopy and Quantum Chemical Studies
Centre d’Élaboration de Matériaux et d’Études Structurales
2014-2023
Centre National de la Recherche Scientifique
2014-2023
Centre de Nanosciences et de Nanotechnologies
2013-2022
Université de Toulouse
2009-2019
Agence de la transition écologique
2019
Centre National de Recherches Météorologiques
2017
BP (United Kingdom)
2015-2016
University of Puerto Rico at Carolina
2014
British American Tobacco (Germany)
2014
Université Toulouse III - Paul Sabatier
1997-2012
Ultrathin insulating NaCl films have been employed to decouple individual pentacene molecules electronically from the metallic substrate. This allows inherent electronic structure of free molecule be preserved and studied by means low-temperature scanning-tunneling microscopy. Thereby direct images unperturbed molecular orbitals are obtained. Elastic scattering quantum chemistry calculations substantiate experimental findings.
Visualizing Bond Order lengths in conjugated molecules closely reflect individual bond order and are usually determined by diffraction methods. It is valuable to know for rationalizing aromaticity, reactivity chemical structure determination. Gross et al. (p. 1326 ; see the Perspective Perez cover) differentiated orders fullerene C 60 polyaromatic hydrocarbons imaging with noncontact atomic force microscopy (AFM). The were adsorbed onto a copper surface, AFM tip was decorated CO molecule,...
A detailed experimental and theoretical investigation of the processes involved in manipulation individual specially designed porphyrin-based molecules by scanning tunneling microscopy at low temperature is presented. On a stepped Cu(211) surface, interaction between tip molecule was used to locally modify reversible way internal configuration single molecule, thus drastically changing current passing through it. Model calculations confirm that this realizes principle conformational molecular switch.
The monometallic complexes [(bpy)2Ru(tpphz)]2+ (4) and [(bpy)2Os(tpphz)]2+ (5), where tpphz is the poorly soluble fully aromatic tetrapyrido[3,2-a:2',3'-c:3'',2''-h:2''',3'''-j]phenazine, have been obtained by reaction of 5,6-diamino-1,10-phenanthroline with [(bpy)2M(phendione)]2+ (M = RuII or OsII). Reaction 4 5 metallic precursors yielded homo- heterobimetallic [(bpy)2Ru(tpphz)Ru(NH3)4]4+ (6), [(bpy)2Ru(tpphz)Ru(bpy)2]4+ (7), [(bpy)2Os(tpphz)Os(bpy)2]4+ (8), [(bpy)2Ru(tpphz)Os(bpy)2]4+...
The three isomers of diferrocenylbenzenes (ortho, 1o; meta, 1m; para, 1p) as well 5-substituted derivatives m-diferrocenylbenzene with R = NH2 (2), Cl (3), CH3 (4), CN (5), NO2 (6), and N(CH3)33+ (7) have been prepared. Crystal structures 1o, 3, 5 solved. In 3 5, the cyclopentadienyl rings are nearly parallel to benzene mean planes angles ranging from 9.99(5)° 14.74(5)°. One ferrocene group is above other below molecular plane. For there an important twist between cyclopentadiene (68.6(8)°...
Beyond supramolecular self-assembly: On-surface covalent coupling of organic precursors is a powerful method to obtain 1D or 2D robust molecular arrays on substrate (see picture) that have numerous potential applications in nanotechnology. Significant advances recently been made this field including imine formation, dehydration boronic acids, esterification, as well radical and carbene reactions.
The electronic connection of single molecules to nanoelectrodes on a surface is basic, unsolved problem in the emerging field molecular nanoelectronics. By means variable temperature scanning tunneling microscopy, we show that an organic molecule (C90H98), known as Lander, can cause rearrangement atoms Cu(110) surface. These act templates accommodating metal at step edges copper substrate, forming metallic nanostructures (0.75 nanometers wide and 1.85 long) are adapted dimensions molecule.
The fabrication of large molecular devices, directly on surfaces in UHV conditions, by covalent coupling smaller precursors has become the past years an attractive solution for Molecular Electronics. This review presents state-of-the-art and analysis potential this new field, from Ullmann type C-C coupling, cyclodehydrogenation, reactions involving heteroelements to 2D polymerisation insulating thin films. Mechanistic insights are also mentioned, giving preliminary explanations influence...
We have spatially resolved the electronic penetration of metallic states through a molecular wire connected to an atomically clean contact. The wire, which is 0.3 nm wide and 1.7 long, was electronically on one side, scanning tunneling microscope tip used as second movable counterelectrode. results reveal clear exponential decay in transparency (conductance) with distance from contacted end. Analysis data shows that electrons are transported along by virtual resonance inverse length 4...
On-surface synthesis in ultrahigh vacuum provides a promising strategy for creating thermally and chemically stable molecular structures at surfaces. The two-dimensional confinement of the educts, possibility working higher (or lower) temperatures absence solvent, templating effect surface bear potential preparing compounds that cannot be obtained solution. Moreover, covalently linked conjugated molecules allow efficient electron transport are, thus, particularly interesting future...
Based on a low-temperature scanning tunneling microscopy study, we present direct visualization of cycloaddition reaction performed for some specific fluorinated maleimide molecules deposited graphene. Up to now, it was widely admitted that such can not happen without pre-existing defects. However, our study shows the be carried out defect-free basal graphene plane at room temperature. In course covalently grafting graphene, sp2 conjugation carbon atoms broken, and local sp3 bonds were...
We present the on-surface reduction of diepoxytetracenes to form genuine tetracene on Cu(111). The conversion is achieved by scanning tunneling microscopy (STM) tip-induced manipulation as well thermal activation and conclusively demonstrated means atomic force (AFM) with resolution. observe that metallic surface plays an important role in deoxygenation for planarization after bond cleavage.
Assembling and aligning molecules on surfaces: By creating a suitable O–Cu nanotemplate Cu(110) surface, "Lander" were successfully assembled into long, well-ordered one-dimensional chains (see picture). controlling the ratio between length of width bare Cu stripes, can be forced to align along specific direction stripes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Iron with Dipicolinic Acid. 1. Mononuclear Complexes Iron(II) or Iron(III)P. Laine, A. Gourdon, and J.-P. LaunayCite this: Inorg. Chem. 1995, 34, 21, 5129–5137Publication Date (Print):October 1, 1995Publication History Published online1 May 2002Published inissue 1 October 1995https://doi.org/10.1021/ic00125a009Request reuse permissionsArticle Views852Altmetric-Citations89LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant...
The conformations of organometallic polymers formed via the bottom-up assembly monomer units on a metal surface are investigated, and relationship between adsorption geometry individual units, conformational structure chain, overall shape polymer is explored. Iodine-functionalized deposited Au(111) substrate found to form linear chain structures in which each linked its neighbors Au adatom. Lateral manipulation chains using scanning tunneling microscope allows be converted from curved...
The development of functional organic molecules requires structures increasing size and complexity, which are typically obtained by the covalent coupling smaller building blocks. Herein, with aid high-resolution scanning tunneling microscopy/spectroscopy density theory, a sterically demanded pentacene derivative on Au(111) into fused dimers connected non-benzenoid rings was studied. diradical character products tuned according to section. In particular, antiaromaticity cyclobutadiene as...
The technique of single atom manipulation by means the scanning tunneling microscope (STM) applies to controlled displacement large molecules. By a combined experimental and theoretical work, we show that in constant height mode STM current intensity carries detailed information on internal mechanics molecule when guided tip. Controlling time following intramolecular behavior surface is first step towards design molecular tunnel-wired nanorobots.
A crucial problem in molecular electronics is the control of electronic contact between a molecule and its electrodes. As model system, we investigated wire group C90H98 (Lander) edge Cu(111) monatomic step. The reproducible decontact was obtained by manipulating Lander with low temperature scanning tunneling microscope. standing wave patterns on surface serve to monitor local perturbation caused interaction end step edge, giving information quality contact.
The luminescent dinuclear ruthenium complex [(bpy)2Ru(bqpy)Ru(bpy)2]4+ (1) comprising the 20 Å long fully aromatic bridging ligand bqpy has been synthesized by successive reactions from suitable precursor complexes. Investigations in electrospray mass spectrometry and 1H NMR spectroscopy have indicated formation of supramolecular aggregates strong π-stacking large parts. Despite extended character ligand, electrochemical spectroscopic studies shown that is composed four noninteracting parts:...