A5059803666- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Crystallography and molecular interactions
- Metal-Organic Frameworks: Synthesis and Applications
- Organic and Molecular Conductors Research
- Metal complexes synthesis and properties
- Electron Spin Resonance Studies
- Metal-Catalyzed Oxygenation Mechanisms
- Porphyrin and Phthalocyanine Chemistry
- Advanced NMR Techniques and Applications
- Organometallic Complex Synthesis and Catalysis
- Polyoxometalates: Synthesis and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray Imaging Techniques
- Luminescence Properties of Advanced Materials
- Supramolecular Chemistry and Complexes
- Glass properties and applications
- Molecular spectroscopy and chirality
- Mechanical and Optical Resonators
- Metalloenzymes and iron-sulfur proteins
- Organic Light-Emitting Diodes Research
- Particle Accelerators and Free-Electron Lasers
- Advanced Chemical Physics Studies
Centre National de la Recherche Scientifique
2016-2025
Paul Pascal Research Center
2016-2025
Université de Bordeaux
2016-2025
Center for Research in Psychopathology and Clinical Psychology
2015-2024
University of Puerto Rico at Carolina
2016
Northeast Normal University
2013
Synchrotron soleil
2006-2010
Lightening the load Permanent magnets are generally produced from solid metals or alloys. Less dense compositions involving lighter elements tend to demagnetize well below room temperature under modest applied external fields. Perlepe et al. now report that chemical reduction of a low-density chromium-pyrazine network produces magnet remains stable above 200°C and resists demagnetization with 7500-oersted coercivity at temperature. The straightforward synthetic route material shows promise...
The isolation of formally two-coordinate lanthanide (Ln) complexes is synthetically challenging, due to predominantly ionic Ln bonding regimes favoring high coordination numbers. In 2015, it was predicted that a near-linear dysprosium bis(amide) cation [Dy{N(Si
Molecules exhibiting bistability have been proposed as elementary binary units (bits) for information storage, potentially enabling fast and efficient computing. In particular, transition metal complexes can display magnetic via either spin-crossover or single-molecule magnet behavior. We now show that the octahedral iron(II) in molecular salt [Fe(1-propyltetrazole)6](BF4)2, when placed its high-symmetry form, combine both types of Light irradiation under an applied field enables fully...
A supramolecular species composed of a pair nonequivalent Dy(III)–radical complexes exhibits single-molecule magnet (SMM) properties. The weak effective antiferromagnetic coupling between the Dy(III) ions can be compensated by application small (700 Oe) dc field, revealing relaxation mode two distinct SMMs. These unique results illustrate how dynamics [Dy-Radical]2 SMM fine-tuned exchange-bias and an applied magnetic field.
Abstract The dehydrating cyclotrimerization of 1‐tetralone in the presence titanium tetrachloride at high temperatures leads to homotruxene, a nonplanar arene which twist angles between its three outer benzene rings and central are stabilized by ethylene bridges. This non‐planar configuration allows for pronounced spin–orbit coupling triplet energy, leading room‐temperature phosphorescence air with lifetime 0.38 s quantum yield 5.6 %, clearly visible human eye after switching off excitation....
Abstract Single-ion anisotropy is vital for the observation of Single-Molecule Magnet (SMM) properties (i.e., a slow dynamics magnetization) in lanthanide-based systems. In case europium, occurrence this phenomenon has been inhibited by spin and orbital quantum numbers that give way to J = 0 trivalent state half-filled population 4f orbitals divalent state. Herein, optimizing local crystal field quasi-linear bis(silylamido) Eu II complex, [Eu (N{SiMePh 2 } ) ] SMM described, providing an...
Sequential reaction of the multisite coordination ligand (LH3) with Cu(OAc)2·H2O, followed by addition a rare-earth(III) nitrate salt in presence triethylamine, afforded series heterometallic heptanuclear complexes containing [Cu5Ln2] core {Ln = Y(1), Lu(2), Dy(3), Ho(4), Er(5), and Yb(6)}. Single-crystal X-ray crystallography reveals that all are dicationic species crystallize two anions to compensate charge. The aggregates 1–6 centrosymmetrical complexes, hexagonal-like arrangement six...
Structural, spectroscopic and magnetic methods have been used to characterize the tris(carbene)borate compound PhB(MesIm)<sub>3</sub>MnN as a four-coordinate manganese(<sc>iv</sc>) complex with low spin (<italic>S</italic> = 1/2) configuration.
A polyoxometalate (POM)-based {Mn(IV)2Mn(III)6Mn(II)4} complex with single-molecule magnet (SMM) behaviour was prepared, exhibiting the largest known Mn nuclearity and most valence states in POM-based SMM family.
An iron(II) pyridyl-benzohydrazonate-based complex decorated with long alkyl chains is reported as a rare spin-crossover compound displaying wide thermal hysteresis spanning room temperature. On heating, this exhibits spin transition between LS ground state and an ordered HS-LS phase symmetry breaking from monoclinic P21/n into orthorhombic P21212 space groups. During cooling, the first transits magnetically distinguishable P21 before returning phase. Interconversion two distinct phases...
The iron(II) [2×2] grid complex Fe-8H has been synthesized and characterized. It undergoes spin-crossover (SCO) upon deprotonation of the hydrazine-based terpyridine-like ligand. patterns have determined by X-ray crystallography 1H NMR spectroscopy discussed in relation to spin state centers, which influences greatly pKa synthesis magnetically silent zinc(II) analogue is also reported, its (de)protonation behavior characterized serve as a reference for study FeII complexes. DFT computations...
Herein, we describe an uncommon example of a manganese–thiolate complex, which is capable activating dioxygen and catalyzing its two-electron reduction to generate H2O2. The structurally characterized dimercapto-bridged MnII dimer [MnII2(LS)(LSH)]ClO4 (MnII2SH) formed by reaction the LS ligand (2,2′-(2,2′-bipyridine-6,6′-diyl)bis(1,1-diphenylethanethiolate)) with MnII. unusual presence pendant thiol group bound one ion in MnII2SH evidenced both solid state solution. complex reacts CH3CN,...
The new THz beamline (AILES) located at the third generation Synchrotron Radiation source SOLEIL is now operating for applications in a wide variety of research themes. In particular, this with its adapted optics allows high resolution spectroscopic measurements molecules entire infrared and range. This presentation focuses on performances concerning flux, spectral range stability molecular spectroscopy. Thanks to these performances, coupling synchrotron radiation from highly stable FTIR...
A dinuclear CoII complex, [Co2 (tphz)(tpy)2 ]n+ (n=4, 3 or 2; tphz: tetrapyridophenazine; tpy: terpyridine), has been assembled using the redox-active and strongly complexing tphz bridging ligand. The magnetic properties of this complex can be tuned from spin-crossover with T1/2 ≈470 K for pristine compound (n=4) to single-molecule magnet an ST =5/2 spin ground state when once reduced (n=3) finally a diamagnetic species twice (n=2). two successive reversible reductions are concomitant...
Molecular complexes based on Prussian Blue analogues have recently attracted considerable interest for their unique bistable properties combined to ultimately reduced dimensions. Here, we investigate the first dinuclear FeCo complex exhibiting both thermal and photomagnetic bistability in solid state. Through an experimental theoretical approach combining local techniques-X-ray absorption spectroscopy (XAS), X-ray magnetic circular dichroism (XMCD), ligand field multiplet calculations-we...
A cyanide-bridged [Fe2Co2] molecular square complex, {[Fe(Tp)(CN)3]2[Co(L)2]2}(BF4)2·2CH3CN·6H2O [1; Tp = hydrotris(pyrazol-1-yl)borate and L bis(1-ethyl-1H-imidazol-2-yl)ketone], has been synthesized characterized fully by single-crystal X-ray diffraction, (photo)magnetic measurements, optical reflectivity, other physical measurements. 1 exhibits a two-step metal-to-metal electron-transfer (MMET)-induced spin transition accompanied thermal hysteresis (T1/2↑ 332 407 K T1/2↓ 320 405 K,...
A 2D coordination polymer, {[Fe(L)2(NCSe)2]·6MeOH·14H2O}n (1; L = 2,5-dipyridylethynylene-3,4-ethylenedioxythiophene), has been synthesized based on a redox active luminescence ligand. 1 possesses [4 × 4] square-grid network where the iron(II) center is in FeN6 octahedral environment. displays reversible thermoinduced high-spin (HS; S 2) to diamagnetic low-spin (LS; 0) ON/OFF spin-state switching with T1/2 value of 150 K. Interestingly, optical reflectivity and photomagnetic studies at 10 K...
The attractive electronic properties of metal-pyrazine materials─electrical conductivity, magnetic order, and strong coupling─can be tuned in a wide range depending on the metal employed, as well its ligand-imposed redox environment. Using solvent-directed synthesis to control dimensionality such systems, discrete tetranuclear chromium(III) complex, exhibiting rare example bridging radical pyrazine, has been prepared from chromium(II) triflate neutral pyrazine. antiferromagnetic interaction...
The neutral radical 4-(2'-benzimidazolyl)-1,2,3,5-dithiadiazolyl (HbimDTDA) exhibits a first order phase transition around 270 K without symmetry breaking, preserving its orthorhombic Pbca space group between 340 and 100 K. Associated with this reversible single-crystal-to-single-crystal transition, thermal hysteresis of the magnetic susceptibility is observed. low temperature (LT) diamagnetic owing to pancake bonding π-radicals. In paramagnetic high (HT) phase, bonds are broken, new...
A series of d-block metal complexes the recently reported coordinating neutral radical ligand 1-phenyl-3-(pyrid-2-yl)-1,4-dihydro-1,2,4-benzotriazin-4-yl (1) was synthesized. The investigated systems contain benzotriazinyl 1 coordinated to a divalent cation, Mn(II) , Fe(II) Co(II) or Ni(II) with 1,1,1,5,5,5-hexafluoroacetylacetonato (hfac) as auxiliary choice. synthesized were fully characterized by single-crystal X-ray diffraction, magnetic susceptibility measurements, and electronic...
A mononuclear FeII complex that shows a high-spin (S=2) paramagnetic behavior at all temperatures (with standard temperature-scan rates, ≈1 K min-1 ) has, in fact, low-spin (S=0) ground state below 100 K. This is not easily accessible due to the extremely slow dynamics of spin-crossover process-a full relaxation from metastable takes more than 5 h 80 Bidirectional photo-switching achieved reproducibly by two selective irradiations (at 530-590 and 830-850 nm). The strong structural...
The use of 2-pyridinealdoxime (paoH), methyl 2-pyridyl ketone oxime (mepaoH), phenyl (phpaoH) and pyridine-2-amidoxime (NH2paoH) for the synthesis dinuclear CoIII/DyIII complexes is described in absence or presence an external base. Complexes [CoDy(pao)3(NO3)3] (1), [CoDy(mepao)3(NO3)3] (2), [CoDy(phpao)3(NO3)3] (3) [CoDy(NH2pao)3(NO3)3]·3MeOH (4·3MeOH) have been isolated their structures determined by single-crystal X-ray crystallography. crystallize non-centrosymmetric (2, 3)...