A5059378013- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Crystallography and molecular interactions
- Metal complexes synthesis and properties
- Organometallic Complex Synthesis and Catalysis
- Electron Spin Resonance Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Synthesis and characterization of novel inorganic/organometallic compounds
- Molecular Junctions and Nanostructures
- Porphyrin and Phthalocyanine Chemistry
- Molecular spectroscopy and chirality
- Organic and Molecular Conductors Research
- Chemical Synthesis and Characterization
- Advanced NMR Techniques and Applications
- Asymmetric Hydrogenation and Catalysis
- Metal-Organic Frameworks: Synthesis and Applications
- Spectroscopy and Quantum Chemical Studies
- Silicon Nanostructures and Photoluminescence
- Metalloenzymes and iron-sulfur proteins
- Magnetic properties of thin films
- Crystal structures of chemical compounds
- Crystallography and Radiation Phenomena
- Coordination Chemistry and Organometallics
Institut de Chimie de la Matière Condensée de Bordeaux
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Université de Bordeaux
2016-2025
Institut Polytechnique de Bordeaux
2013-2025
Bipar
2018-2020
P.L. Kapitza Institute for Physical Problems
2019
Research Institute of Agriculture of Crimea
2019
European Synchrotron Radiation Facility
2018
University of Puerto Rico at Carolina
2016-2017
National Tsing Hua University
2016
Tetrairon(III) Single-Molecule Magnets (SMMs) with a propeller-like structure exhibit tuneable magnetic anisotropy barriers in both height and shape. The clusters [Fe4(L1)2(dpm)6] (1), [Fe4(L2)2(dpm)6] (2), [Fe4(L3)2(dpm)6].Et2O (3.Et2O), [Fe4(OEt)3(L4)(dpm)6] (4) have been prepared by reaction of [Fe4(OMe)6(dpm)6] (5) tripodal ligands R-C(CH2OH)3 (H3L1, R = Me; H3L2, CH2Br; H3L3, Ph; H3L4, tBu; Hdpm dipivaloylmethane). iron(III) ions centered-triangular topology are linked six alkoxo...
Using X-ray absorption techniques, we show that temperature- and light-induced spin crossover properties are conserved for a submonolayer of the [Fe(H2B(pz)2)2(2,2'-bipy)] complex evaporated onto Au(111) surface. For significant fraction molecules, see changes in at L2,3 edges consistent with those observed bulk thick film references. Assignment these to is further supported by multiplet calculations simulate spectra. As others have experiments on monolayer coverages, find many molecules our...
A Dy–biradical complex was synthesized and characterized down to very low temperature. ac magnetic measurements reveal single molecule magnet behaviour visible without any application of dc field. The transition the quantum tunneling regime is evidenced. Photophysical EPR provide evidence excellent stability these complexes in solution.
A scissor-like geometric mechanism is responsible for the strongest negative linear compression effect yet observed in a molecular material, [Fe(dpp)2(NCS)2]⋅py (see picture; dpp=dipyrido[3,2-a:2′3′-c]phenazine), C gray, N blue, S yellow, Fe red). The same also suppressing high-spin to low-spin transition under pressure. Detailed facts of importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available...
We report clean evaporation under ultra-high vacuum conditions of two spin crossover materials, yielding either microcrystallites or homogeneous thin films. Magnetic and photomagnetic studies show that thermal light-induced properties are preserved. Preliminary STM imaging sub-monolayers indicates the deposited molecules remain intact on surface.
The synthesis, structural and magnetic characterisation of a new polymetallic cobalt complex are reported; the behaviour is unusual.
The design of molecule-based systems displaying tuneable optical and/or magnetic properties under external stimuli has received a great deal attention in the past few years. This interest is driven by potential applications high-performance electronics areas recording media, switches, sensors, and displays. As an example, three-dimensional Fe/Co Prussian blue compounds exhibit concomitant change due to temperature- or light-induced metal-to-metal electron transfer. foregoing remarkable blues...
The spin state of [Fe(H2B(pz)2)2(bipy)] thin films is mediated by changes in the electric field at interface organic ferroelectric polyvinylidene fluoride with trifluoroethylene (PVDF-TrFE). Signatures molecular crossover transition are evident unoccupied states and related shift from diamagnetic to paramagnetic characteristics. This may point way magneto-electric effect on devices.
The effect of pressure on the dinuclear spin crossover material [{Fe(bpp)(NCS)(2)}(2)(4,4'-bipy)]·2MeOH (where bpp = 2,6-bis(pyrazol-3-yl)pyridine and 4,4'-bipy 4,4'-bipyridine, 1) has been investigated with single crystal X-ray diffraction Raman spectroscopy using diamond anvil cell techniques. very gradual pressure-induced occurs between 7 25 kbar, shows no evidence crystallographic phase transitions. transition leads to a complete LS state which is not thermally accessible. This...
Abstract The Fe(II) spin crossover complex [Fe{H 2 B(pz) } (bipy)] (pz = pyrazol‐1‐yl, bipy 2,2′‐bipyridine) can be locked in a largely low‐spin‐state configuration over temperature range that includes temperatures well above the thermal of 160 K. This locking state is achieved for nanometer thin films this two distinct ways: through substrate interactions with dielectric substrates such as SiO and Al O 3 , or powder samples by mixing strongly dipolar zwitterionic p ‐benzoquinonemonoimine C...
et à la diffusion de documents scientifiques niveau recherche, publiés ou non, émanant des établissements d'enseignement recherche français étrangers, laboratoires publics privés.
Homo- and heterometallic 1D coordination polymers of transition metals (Co II, Mn Zn II) have been synthesized by an in-situ ligand generation route. Carboxylato-based complexes [Co(PhCOO)2]n (1 a, 1 b), [Co(p-MePhCOO)2]n (2), [ZnMn(PhCOO)4]n (3), [CoZn(PhCOO)4]n (4) (PhCOOH=benzoic acid, p-MePhCOOH=p-methylbenzoic acid) characterized chemical analysis, single-crystal X-ray diffraction, magnetization measurements. The new 2 3 crystallize in orthorhombic space groups Pnab Pcab respectively....
Thin films of a molecular spin crossover iron(<sc>ii</sc>) complex featuring photochromic diarylethene-based ligand have been grown by sublimation in ultra-high vacuum on Au(111) and investigated photoelectron spectroscopies.
The integration of chiral and magnetic properties has gained increasing interest due to its potential for enabling magneto-chiral phenomena. However, the development nanoscale systems that exhibit strong responsiveness both light fields remains largely underexplored. In this context, we investigate use silica nanohelices as a platform inducing circular dichroism (CD) in iron oxide nanoparticles (NPs). Two strategies are compared: an ex situ approach, where NPs synthesized independently then...
We report the preparation of a helical complex and its study in molecular junctions. show that SAMs this racemic compound present an electrically robust behaviour which will...
We study the role of defects in ``single-chain magnet'' CoPhOMe by inserting a controlled number diamagnetic impurities. The samples are analyzed with unprecedented accuracy particle induced x-ray emission technique, and ac dc magnetic measurements. In an external applied field system shows unexpected behavior, giving rise to double peak susceptibility. static thermodynamic properties randomly diluted Ising chain alternating $g$ values then exactly obtained via transfer matrix approach....
Variable-temperature studies of the electronic structures four different Fe(II) spin crossover molecules, [Fe(H2B(pz)2)2(bipy)] (pz = pyrazol-1-yl, bipy 2,2′-bipyridine), [Fe(H2B(pz)2)2(phen)], [Fe(phen)2(NCS)2] (phen 9,10-phenantroline), and [Fe(PM-AzA)2(NCS)2] (PM-AzA 4-phenyldiazenyl-N-(pyridin-2-ylmethylene)aniline) by X-ray absorption spectroscopy (XAS), combined with electrical properties single crystal are presented. We show that both XAS signature state powdered samples dielectric...
Abstract Thin films of a molecular spin crossover (SCO) Iron(II) complex featuring high transition temperature are grown by sublimation in vacuum on TS Au and investigated X‐ray UV photoelectron spectroscopies. Temperature‐dependent studies demonstrate that the thermally induced behavior is preserved thin films. A large‐area ultrathin switchable vertical tunnel junction with top electrodes liquid eutectic gallium indium, for which spin‐state switching induces two orders magnitude change...
By hydrothermal reaction of CoCl2 x 6H2O with K2pcc (H2pcc = phenyl(carboxymethyl) phosphinic acid) at 423 K, a novel hybrid material formula [Co2(pcc)2 (H2O)2] H2O has been obtained. The compound, which is the first pcc/metal complex reported, exhibits polymeric arrangement, where cobalt metal ions, linked together by bridging carboxylate and phosphinate oxygens, form infinite chains edge-shared CoO6 octahedra. are in turn through important hydrogen-bonding interactions, create an 2D...
We have investigated the occupied and unoccupied electronic structure of ultrahigh vacuum (UHV) evaporated molecular thin films spin crossover [Fe(H2B(pz)2)2(bipy)] complex (with H2B(pz)2 = bis(hydrido)bis(1H-pyrazol-1-yl)borate bipy 2,2′-bipyridine) by ultraviolet photoelectron spectroscopy (UPS), inverse photoemission (IPES), X-ray absorption (XAS). A bandgap 2–3 eV is deduced from combined UPS IPES measurements on Au substrates. The matching Fe XAS spectra indicate that states a...
We investigated the interplay between thermal decay of low temperature metastable HS state and hysteresis metal diluted spin-crossover complexes, [FexMn1–x(dpp)2(NCS)2].py (dpp = dipyrido[3,2-a:2′,3′-c]phenazine py pyridine). The T(LIESST) could be shifted into quasi-static range by several means: increase Mn content, scan rate heating experiment, irradiation using visible light. A detailed investigation isothermal relaxation at various temperatures was made compared to simulations....