A5038846739- Magnetism in coordination complexes
- Crystallization and Solubility Studies
- Lanthanide and Transition Metal Complexes
- X-ray Diffraction in Crystallography
- Organic and Molecular Conductors Research
- Metal-Organic Frameworks: Synthesis and Applications
- Electron Spin Resonance Studies
- Metal complexes synthesis and properties
- Molecular Junctions and Nanostructures
- Porphyrin and Phthalocyanine Chemistry
- Metal-Catalyzed Oxygenation Mechanisms
- Crystallography and molecular interactions
- Polyoxometalates: Synthesis and Applications
- Advanced NMR Techniques and Applications
- Quantum and electron transport phenomena
- Graphene research and applications
- Magnetic properties of thin films
- Surface Chemistry and Catalysis
- Nanocluster Synthesis and Applications
- Carbon Nanotubes in Composites
- Organometallic Complex Synthesis and Catalysis
- Inorganic Chemistry and Materials
- Iron oxide chemistry and applications
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Mesoporous Materials and Catalysis
Institut de Chimie Moléculaire et des Matériaux d'Orsay
2016-2025
Université Paris-Saclay
2016-2025
Centre National de la Recherche Scientifique
2015-2024
Université Paris-Sud
2013-2022
Centre Hospitalier d'Orsay
2014-2021
Université Paris Cité
2003-2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1996-2014
Institut Rayonnement-Matière de Saclay
2014
Laboratoire de Chimie Moléculaire et Thioorganique
2004-2013
Institut de minéralogie, de physique des matériaux et de cosmochimie
2013
Molecular-based magnets with high magnetic-ordering temperatures, T c , can be obtained by mild chemistry methods focusing on the bimetallic and mixed-valence transition metal μ-cyanide of Prussian blue family. A simple orbital model was used to predict electronic structure ions required achieve a ordering temperature. The synthesis magnetic properties two compounds, [Cr 5 (CN) 12 ]⋅10H 2 O Cs 0.75 2.125 6 ]⋅5H O, which exhibited temperatures 240 190 kelvin, respectively, are reported,...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-TC molecular-based magnets: a ferromagnetic bimetallic chromium(III)-nickel(II) cyanide with TC = 90 KV. Gadet, T. Mallah, I. Castro, M. Verdaguer, and P. VeilletCite this: J. Am. Chem. Soc. 1992, 114, 23, 9213–9214Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs.acs.org/doi/10.1021/ja00049a078https://doi.org/10.1021/ja00049a078research-articleACS...
Monometallic Ni(II) and Co(II) complexes with large magnetic anisotropy are studied using correlated wave function based ab initio calculations. Based on the effective Hamiltonian theory, we propose a scheme to extract both parameters of zero-field splitting (ZFS) tensor axes. Contrarily usual theoretical procedure extraction, method presented here determines sign magnitude ZFS in any circumstances. While energy levels provide enough information complexes, additional contained functions must...
Spin-crossover coordination nanoparticles of the cyanide-bridged three-dimensional network Fe(pyrazine){Pt(CN)4} were prepared at three different sizes using a microemulsion. The 14 nm particles present transition centered around 265 K with hysteresis 6 K.
During the last decade, scientific community has become interested in hybrid nanomaterials, especially ones that combine gold nanoparticles with a second functional component. In this context, coordination polymers are materials possess potential advantages over conventional inorganic nanomaterials and organic compounds such as chemical versatility, easy processability, high specific area, low toxicity, biodegradability electronic magnetic functionalities to name few. manner, wise...
In a spin: The mixed-valent {MnIII20−xMnIIx} cage complexes (x=2–6) have structures corresponding to fragment of cubic close-packed lattice (see picture, Mn large sphere, O small sphere). Magnetic studies show for the with x=2 that ground state has spin (S) 19±1 in low field, which increases about S=30 at higher fields. is "single molecule magnet" high energy barrier (43 K) reorientation magnetization. Supporting information this article available on WWW under...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and properties of tris[bis(ethylenedithio)tetrathiafulvalenium]tetrachlorocopper(II) hydrate, (BEDT-TTF)3CuCl4.H2O: first evidence for coexistence localized conduction electrons in a metallic charge-transfer saltP. Day, M. Kurmoo, T. Mallah, I. R. Marsden, H. Friend, F. L. Pratt, W. Hayes, D. Chasseau, J. Gaultier, Cite this: Am. Chem. Soc. 1992, 114, 27, 10722–10729Publication Date (Print):December 1, 1992Publication History Published...
Reaction in water between rare earth ions (Ln = Y, La-Tm, except Pm) and the sodium salt of terephthalic acid leads to a family lanthanide-based coordination polymers general formula [Ln2(C8H4O4)3(H2O)4] n with Ln La-Tm or Y. The isostructurality compounds previously reported Tb-containing polymer is ascertained on basis their X-ray powder diffraction diagrams. molecules can be reversibly removed without destroying crystal structure for involving one lighter lanthanide (La-Eu). For heavier...
The magnetic anisotropy of two pentacoordinate trigonal bipyramidal (C3v symmetry) Co(II) complexes, [Co(Me6tren)Cl]ClO4 (1) and [Co(Me6tren)Br]Br (2), was investigated analysed by studies, high field multifrequency electron paramagnetic resonance (EPR) ab initio calculations. Negative D parameters expressing an Ising-type (easy axis magnetization) were found experimentally for both complexes. Calculations led to values very close the experimental ones, which allows a robust rationalisation...
The nature and magnitude of the magnetic anisotropy heptacoordinate mononuclear Ni(II) Co(II) complexes were investigated by a combination experiment ab initio calculations. zero-field splitting (ZFS) parameters D [Ni(H(2)DAPBH)(H(2)O)(2)](NO(3))(2)⋅2 H(2)O (1) [Co(H(2)DAPBH)(H(2)O)(NO(3))](NO(3)) [2; H(2)DAPBH = 2,6-diacetylpyridine bis- (benzoyl hydrazone)] determined means magnetization measurements high-field high-frequency EPR spectroscopy. negative value, hence an easy axis...
This paper reports the experimental and theoretical investigations of two trigonal bipyramidal Ni(II) complexes, [Ni(Me(6)tren)Cl](ClO(4)) (1) [Ni(Me(6)tren)Br](Br) (2). High-field, high-frequency electron paramagnetic resonance spectroscopy performed on a single crystal 1 shows giant uniaxial magnetic anisotropy with an D(expt) value (energy difference between M(s) = ± 0 components ground spin state S 1) estimated to be -120 -180 cm(-1). The study that, for ideally complex, orbital...
Abstract Spin cross-over molecules show the unique ability to switch between two spin states when submitted external stimuli such as temperature, light or voltage. If controlled at molecular scale, switches would be of great interest for development genuine devices in spintronics, sensing and nanomechanics. Unfortunately, up now, little is known on behaviour organized dimensions their cooperative transformation. Here we demonstrate that a combination scanning tunnelling microscopy...
Anisotropic nanoparticles of the Fe(pyrazine)Pt(CN)4 network were prepared embedded in various matrices that revealed to have a dramatic effect on cooperative spin crossover phenomena. By judicious choice nature matrix and control interparticle distances, hysteresis 15 K was achieved close room temperature for such nano-objects.
Two relaxation processes of the magnetization in an antiferromagnetically coupled Dy<sub>2</sub> metallacrown-based complex.
An opto-electronic switching device made from an evaporated spin crossover thin film over a graphene sensor is presented. The electrical transduction of both temperature and light-induced reversible transitions are demonstrated.
Two novel inorganic−organic hybrid 3D extended networks of Ni(II) and Mn(II) having molecular formulas [(maleate)2Ni3(bpe)4(H2O)4](NO3)2·H2O (1) [(adipate)Mn(bpe)] (2) (bpe = 1, 2-bis(4-pyridyl)ethane), respectively, have been synthesized characterized by single-crystal X-ray diffraction studies low-temperature (300−2 K) magnetic measurements. Compound 1 crystallizes in the monoclinic system, space group C2/c (No. 15), with chemical formula C56H62N10Ni3O19, a 30.955(4) Å, b 12.705(3) c...
The synthesis, structural characterization, and magnetic properties of a new Prussian blue analogue, the molecule-based ferrimagnet (VIVO)[CrIII(CN)6]2/3·10/3H2O (1) (TC = 115 K), are presented. crystal structure is determined from powder X-ray diffraction diagram using Rietveld method. system cubic, space group Fm3m with cell parameter 10.490(4) Å. value exchange coupling J (−48 cm-1) between CrIII VIVO estimated molecular field W, obtained by fitting |χM-1| f(T) data in paramagnetic phase...
Abstract The reaction of Ni(NO 3 ) 2 ·6H O with H thme (trihydroxymethylethane) in the presence NaOMe leads to a tetranuclear Ni 4 complex cubane‐like structure. Intramolecular ferromagnetic interactions [ J = 10 cm −1 based on − ( S 1 · + )] lead an ground state stabilized by 40 from first excited state. Magnetization vs. field studies at different temperatures above K suggest axial magnetic anisotropy. Single‐crystal magnetization measurements show single‐molecule‐magnetic behavior below T...
A low-lying S= 15/2 ground state in a heptanuclear CrIIINiII6 species arises from the ferromagnetic interaction (J= 16.8 cm–1) between one central CrIII(S= 3/2) and six peripheral NiII(S= 1) ions through cyanide bridge.
Using reverse micelles as nanoreactors facilitates the preparation of bimetallic Cr III –Ni II cyanide‐bridged nanoparticles that behave superparamagnets with a blocking temperature 5.5 K. The Figure presents plot magnetization vs. field for various temperatures. Redispersion in an organic solution allows particles to be diluted polymer matrix (inset Figure) leading shift down 2
A Dy(III)4Mn(III)6 complex with a metallacrown (MC)-like topology possesses frequency-dependent magnetic behavior, indicating possible single-molecule magnet behavior.