A5027512160- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Organic and Molecular Conductors Research
- Electron Spin Resonance Studies
- Advanced NMR Techniques and Applications
- Porphyrin and Phthalocyanine Chemistry
- Crystallography and molecular interactions
- Metal-Catalyzed Oxygenation Mechanisms
- Synthesis and Properties of Aromatic Compounds
- Polyoxometalates: Synthesis and Applications
- Asphalt Pavement Performance Evaluation
- Aerogels and thermal insulation
- Fiber-reinforced polymer composites
- Atomic and Subatomic Physics Research
- Metal-Organic Frameworks: Synthesis and Applications
- Structural Engineering and Vibration Analysis
- Supercapacitor Materials and Fabrication
Université de Rennes
2016-2024
Centre National de la Recherche Scientifique
2016-2024
Institut des Sciences Chimiques de Rennes
2016-2024
Institut National des Sciences Appliquées de Rennes
2021
Université Rennes 2
2019-2020
Institut Universitaire de France
2018
Institut National des Sciences Appliquées de Toulouse
2018
Multidisciplinary Digital Publishing Institute (Switzerland)
2018
Universidad de Extremadura
2004
Abstract A field‐induced chiral Yb III Single‐Molecule Magnet (SMM) displayed an unprecedented near‐infrared circularly polarized luminescence (NIR‐CPL) in the solid‐state. The bridging bis(1,10‐phenantro[5,6b])tetrathiafulvalene triad ( L ) allowed efficient sensitization of NIR 2 F 5/2 → 7/2 emission while NIR‐CPL is associated to f ‐ transitions ion bearing β‐diketonate derived‐camphorate ancillary ligands.
On the role of hyperfine coupling constant on relaxation time single-molecule magnets.
An unprecedented combination of isotopic enrichment and magnetic dilution approaches for a prolate ytterbium(III)-based complex was performed. It results in the appearance first observations nuclear spin effect on both quantum tunneling magnetization slow relaxation an ytterbium under zero applied field.
A series of homometallic dinuclear lanthanide complexes containing nonequivalent metal centers [Ln2(LH2)(LH)(CH3OH)(N3)]·xMeOH·yH2O [1, Ln = DyIII, x 0, y 2; 2, TbIII, 1, 1] have been synthesized [LH4 6-((bis(2-hydroxyethyl)amino)-N′-(2-hydroxybenzylidene)picolinohydrazide] and characterized. The assembly contains two different types nine-coordinated centers, because the binding azide co-ligand as well varying coordination deprotonated Schiff base ligand. Detailed magnetic studies performed...
Simultaneous redox and solvato-magnetic switching was achieved for a dinuclear dysprosium single-molecule magnet involving an extended tetrathiafulvalene fused semiquinone based triad.
Investigation of a series rare peroxide-assisted tetranuclear lanthanide assemblies revealed both significant magnetocaloric effect and slow magnetic relaxation.
The design of a coordination complex that involves ligand combining both tetrathiafulvalene core and helicene fragment was achieved thanks to the reaction between new 2-{1-[2-methyl[6]helicene]-4,5-[4,5-bis(propylthio)tetrathiafulvalenyl]-1 H-benzimidazol-2-yl}pyridine (L) Dy(hfac)3·2H2O metalloprecursor. Magnetic investigations showed field-induced single-molecule-magnet (SMM) behavior under an applied magnetic field 1000 Oe for [Dy(hfac)3(L)]·0.5CH2Cl2, while experimentally oriented...
The extreme sensitivity of trivalent lanthanide ions to crystal field variations led the emergence single-molecule magnetic switching under various stimuli. use pressure as an external stimulus instead classic light irradiation, oxidation or any chemical reactions allows a fine tuning modulation. Here well-known pure isotopically enriched [162 Dy(tta)3 (L)]⋅C6 H14 (162 Dy) Single-Molecule Magnet (SMM) (tta- =2-2-thenoyltrifluoroacetonate and...
Three pentacoordinate Co<sup>II</sup> complexes were synthesized using a common tridentate ligand and varying the halide/pseudohalide ligand. The effect of latter on geometry magnetic properties three has been analysed.
A homodinuclear complex of Dy(<sc>iii</sc>) has been synthesised and characterised. Magnetic analysis disclosed a field-induced slow magnetic relaxation the complex.
The complex [Dy(L)(tta)3] with L the chiral 3-(2-pyridyl)-4-aza[6]-helicene ligand (tta− = 2-thenoyltrifluoroaacetonate) has been synthesized in its racemic form and structurally magnetically characterized. behaves as a single molecule magnet crystalline phase opening of hysteresis loop at 0.50 K. These magnetic properties were interpreted ab initio calculations.
One-dimensional Ln III coordination polymers were obtained by the in situ P–Cl hydrolysis of a carbophosphazene.
Four new dinuclear complexes, [Co(μ-L)(μ-CCl3COO)Y(NO3)2]·2CHCl3·CH3CN·2H2O (1), [Co(μ-L)(μ-CH3COO)Y(NO3)2]·CH3CN (2), [Co(μ-L)(μ-PhCOO)Y(NO3)2]·3CH3CN·2H2O (3), and [Co(μ-L)(μ-tBuCOO)Y(NO3)2]·CHCl3·2H2O (4), having a CoIIYIII core, have been synthesized by employing ferrocene based compartmental ligand which was the reaction of diacetyl with hydrazine hydrate followed condensation o-vanillin. A general synthetic protocol employed to synthesize complexes 1–4, where metallic core kept same...
The reaction between the 2,2’-benzene-1,4-diylbis(6-hydroxy-4,7-di-tert-butyl-1,3-benzodithiol-2-ylium-5-olate triad (H2SQ) and metallo-precursor [Yb(hfac)3]⋅2H2O led to formation of a dinuclear coordination complex formula [Yb2(hfac)6(H2SQ)]⋅0.5CH2Cl2 (H2SQ-Yb). After chemical oxidation H2SQ in 2,2’-cyclohexa-2,5-diene-1,4-diylidenebis(4,7-di-tert-butyl-1,3-benzodithiole-5,6-dione (Q), latter reacted with precursor give [Yb2(hfac)6(Q)] (Q-Yb). Both compounds have been characterized by X-ray...
The complexes [Ln2(hfac)6(L)]·nC6H14 (Ln = Dy (1) n 0, Yb (2) 1) with the L chiral 3,14-di-(2-pyridyl)-4,13-diaza[6]helicene ligand (hfac− 1,1,1,5,5,5-hexafluoroacetylacetonate) have been synthesized in their racemic form and structurally magnetically characterized. Both behave as field-induced single molecule magnets crystalline phase. These magnetic properties were rationalized by ab initio calculations.
Abstract Single‐Molecule Magnet (SMM) property is by essence molecular, while commonly measured in solid crystalline state. Solvent crystallization molecules are usually neglected the analysis and interpretation of solid‐state properties. The solvation/desolvation process polyoxometalate(POM)‐based Na 9 [Er(W 5 O 18 ) 2 ] ⋅ 35 H SMM demonstrates that dehydrated form relaxes more than 1000 times faster initial state, rehydration allows quasi complete recovering magnetic behaviour. This...
The reaction between the 2,6‐di(pyrazol‐1‐yl)‐4‐(bromomethyl)pyridine ( L ) ligand and divalent transition metal salts led to formation of three mononuclear complexes formula [M( 2 ](BF 4 · x MeNO [M = Fe II 1· ), 0 4, M Co , 2·2MeNO and]. Static magnetic measurements highlighted thermal spin crossover at high temperature (320–340 K) for two solvatomorphs nevertheless both solvation degree crystal packing had drastic influence on shape width hysteresis loop. Thus 1 displayed abrupt straight...
Tetrathiafulvalene and 1,10-phenanthroline moieties present, respectively remarkable redox-active complexation activities. In this work, we investigated the coordination reaction between bis(1,10-phenanthro[5,6-b])tetrathiafulvalene triad (L) Dy(hfac)3·2H2O metallo precursor. The resulting {[Dy2(hfac)6(L)]·CH2Cl2·C6H14}3 (1) dinuclear complex showed a crystal structure in which L bridged two terminal Dy(hfac)3 units supramolecular co-planar arrangement of triads is driven by donor-acceptor...
The two mononuclear complexes of the formula [Dy(tta)3(L)] (1) and [Dy(hfac)3(L)] (2) (where tta- = 2-thenoytrifluoroacetylacetonate hfac- 1,1,1,5,5,5-hexafluoroacetylacetonate) were obtained from coordination reaction Dy(tta)3·2H2O or Dy(hfac)3·2H2O units with 1,10-phenantroline-5,6-dione ligand (L). Their structures have been determined by X-ray diffraction studies on single crystals, they revealed a supramolecular assembly tetramers through σ-π interactions. Both displayed Single-Molecule...
The reaction between the 2,2′-benzene-1,4-diylbis(6-hydroxy-4,7-di-tert-butyl-1,3-benzodithiol-2-ylium-5-olate biradical triad (L) and metallo-precursor [Dy(hfac)3]·2H2O leads to formation of a one-dimensional coordination polymer with formula {[Dy(hfac)3(L)]·2C6H14}n (1). X-ray structure reveals that polymeric is formed by bridging Dy(hfac)3 units multi-redox L. Single-crystal diffraction UltraViolet-visible absorption spectroscopy confirm L in 1 bound as direduced, diprotonated form...
3d4f and 4f4f′ heterobimetallic complexes were designed thank to metal selective coordination with a redox-active tetrathiafulvalene-based ligand. Both magnetic photophysical properties investigated.
Dysprosium(<sc>iii</sc>) dinitrobenzonate as a new single molecule magnet.
The complexes [Dy2(tta)6(H2SQ)] (Dy-H2SQ) and [Dy2(tta)6(Q)]·2CH2Cl2 (Dy-Q) (tta− = 2-thenoyltrifluoroacetonate) were obtained from the coordination reaction of Dy(tta)3·2H2O units with 2,2′-benzene-1,4-diylbis(6-hydroxy-4,7-di-tert-butyl-1,3-benzodithiol-2-ylium-5-olate ligand (H2SQ) its oxidized form 2,2′-cyclohexa-2,5-diene-1,4-diylidenebis(4,7-di-tert-butyl-1,3-benzodithiole-5,6-dione (Q). chemical oxidation H2SQ in Q induced an increase number 7 to 8 around DyIII ions by consequence a...
Abstract Two new TTF‐based ligands involving terpyridine moiety (L 1 =4‐(4′‐Methyl‐phenyl‐2,2 : 6’,2’’‐terpyridine −4‐ylmethylthio)‐5‐(2‐cyanoethylthio)‐4′,5′‐bis(methylthio)tetrathiafulvene and L 2 −4‐ylmethylthio)‐5‐(2‐cyanoethylthio)‐4′,5′‐bis(propylthio)tetrathiafulvene) have been synthesized seven related mononuclear complexes were isolated as single crystals. The (ligand metal) of formula [Co(L ) ](NO 3 ( ](BF 4 displayed thermal spin crossover transition while the [CoCl )](DMF) ),...