A5023289483- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Metal complexes synthesis and properties
- Metal-Catalyzed Oxygenation Mechanisms
- Metal-Organic Frameworks: Synthesis and Applications
- Electron Spin Resonance Studies
- Crystallography and molecular interactions
- Porphyrin and Phthalocyanine Chemistry
- Catalysis and Oxidation Reactions
- Advanced NMR Techniques and Applications
- Graphene research and applications
- Molecular Junctions and Nanostructures
- Advanced Chemical Physics Studies
- Catalytic Processes in Materials Science
- Organometallic Complex Synthesis and Catalysis
- Crystal structures of chemical compounds
- Carbon Nanotubes in Composites
- Theoretical and Computational Physics
- Electrochemical Analysis and Applications
- Metalloenzymes and iron-sulfur proteins
- Ionic liquids properties and applications
- Advancements in Battery Materials
- Crystal Structures and Properties
Université de Strasbourg
2018-2025
Institut de Chimie de Strasbourg
2017-2025
Centre National de la Recherche Scientifique
2007-2025
Institut de Science et d'Ingénierie Supramoléculaires
2021-2024
Institut de Chimie
2018-2023
Karlsruhe Institute of Technology
2021-2023
Institut de Physique et Chimie des Matériaux de Strasbourg
2020-2021
Laboratoire de Chimie et Physique Quantiques
2019
Laboratoire de Chimie
2018
Florida International University
2017-2018
Dressed up to the nines: A nonanuclear FeII complex exhibiting rare μ4:η1 azido bridges that induce ferromagnetic exchange interactions possesses a core with very large ground-state spin (probably S=14, see picture). The combination of S value and magnetic anisotropy iron(II) centers endows this unique species superparamagnetic behavior (SMM=single-molecule magnet).
Complexes [Fe9(X)2-(O2CMe)8{(2-py)2CO2}4] (X(-)=OH(-) (1), N3(-) (2), and NCO(-) (3)) have been prepared by a route previously employed for the synthesis of analogous Co(9) Ni(9) complexes, involving hydroxide substitution pseudohalides (N3(-), NCO(-)). As indicated DC magnetic susceptibility measurements, this induced higher ferromagnetic couplings in complexes 2 3, leading to ground spin states compared that 1. Variable-field experiments shown state is not well isolated from excited...
Giant clusters: Metal-assisted hydrolysis of 2,6-bis(2-pyridylcarbonyl)pyridine with Co(O2CMe)2⋅4 H2O in hot DMF yielded an icosanuclear CoII complex containing the triply deprotonated bis(gem-diol) form ligand and exhibiting superparamagnetic relaxation its magnetization. The picture shows central Co–O core (Co violet, O red). Supporting information for this article is available on WWW under http://www.wiley-vch.de/contents/jc_2002/2006/z502519_s.pdf or from author. Please note: publisher...
Six dinuclear ferrous complexes including [Fe2(acpypentO)(O2CMe)(NCS)2] (1), [Fe2(acpypentO)(O2CMe)(NCSe)2] (2), [Fe2(acpypentO)(NCO)3] (3), ([Fe2(acpybutO)(O2CMe)(NCS)2] (5), [Fe2(acpybutO)(O2CMe)(NCO)2] (6), and [Fe2(acpybutO)(O2CMe)(N3)2] (7), one tetranuclear (bis-dinuclear) compound, [Fe4(acpypentO)2(N3)6] (4), mononuclear [Fe(acpybutOH)(NCS)2] (8), have been prepared, their structures magnetic Mössbauer properties studied (acpybutOH = 1,4-bis[[2-pyridyl(1-ethyl]imino)]butane-2-ol...
Reaction of copper(II) perchlorate with di-2,6-(2-pyridylcarbonyl)pyridine (pyCOpyCOpy, dpcp) in the presence sodium azide yields complex [Cu4(N3)2{pyC(OMe)(O)pyC(OMe)(O)py}2(MeOH)2](ClO4)·2MeOH (1·2MeOH), which crystallizes monoclinic P21/c space group. Similar reaction cobalt(II) nitrate [Co4(N3)2(NO3)2{pyC(OMe)(O)pyC(OMe)(O)py}2]·0.5MeOH (2·0.5MeOH) I2/m nickel(II) [Ni6(CO3)(N3)6{pyCOpyC(O)(OMe)py}3(MeOH)2(H2O)][Ni6(CO3)(N3)6{pyCOpyC(O)(OMe)py}3 (MeOH)3](ClO4)2·1.8MeOH (3·1.8MeOH),...
The presence of defects in carbon materials, such as electronically unsaturated sites, can profoundly affect their magnetic ordering and chemical reactivity. detailed analysis these species (edge states, σ free radicals, or carbene), which are pivotal for many applications, remains a significant challenge bulk materials. Today, the engineering defective materials often relies on use hardly up-scalable physical methods not accessible to synthetic chemists. It is therefore important develop...
The preparations, X-ray structures, and detailed physical characterizations are presented for three new tetranuclear Fe(III)/RCO(2)(-)/phen complexes, where phen = 1,10-phenanthroline: [Fe(4)(OHO)(OH)(2)(O(2)CMe)(4)(phen)(4)](ClO(4))(3).4.4MeCN.H(2)O (1.4.4MeCN.H(2)O); [Fe(4)O(2)(O(2)CPh)(7)(phen)(2)](ClO(4)).2MeCN (2.2MeCN); [Fe(4)O(2)(O(2)CPh)(8)(phen)(2)].2H(2)O (3.2H(2)O). Complex 1.4.4MeCN.H(2)O crystallizes in space group P2(1)/n, with a 18.162(9) A, b 39.016(19) c 13.054(7) beta...
Compound [Cu(3)(N(3))(6)(DMF)(2)](n) () was initially obtained in a serendipitous way during efforts to prepare Cu(II)/N(3)(-)/Mebta coordination polymer (Mebta = 1-methylbenzotriazole). With the identity of established by single-crystal crystallography, rational preparative route this complex designed and carried out reacting Cu(ClO(4)).6H(2)O with two equivalents NaN(3) DMF. Complex is 2D possessing mu(1,1,1) mu(1,1,3) azido ligands. Its structure consists {Cu(3)(N(3))(6)(DMF(2))}...
Single-crystal EPR experiments show that the highly symmetric antiferromagnetic half-integer spin triangle [Fe3 O(O2 CPh)6 (py)3 ]ClO4 ⋅py (1, py=pyridine) possesses a ST =1/2 ground state exhibiting high g-anisotropy due to antisymmetric exchange (Dzyaloshinskii-Moriya) interactions. under static electric fields parallel triangle's plane (i.e., perpendicular magnetic z-axis) reveal this couples externally applied fields. This magnetoelectric coupling causes an increase in intensity of...
Abstract Nowadays, Al (dual) batteries are mainly based on graphite cathode materials. Besides this material, the limited life cycle and rate performance of other possible materials have hampered development practical sustainable rechargeable aluminium (RABs). Herein, we report an organic A 4 ‐metal‐free porphyrin system bearing diphenylamimo‐phenyl functional units as Al‐storage which is capable delivering a reversible capacity 83 mAh g −1 at 1 after 200 cycles displays good cycling...
Electric fields represent an ideal means for controlling spins at the nanoscale and, more specifically, manipulating protected degrees of freedom in multispin systems. Here we perform low-temperature magnetic far-IR spectroscopy on a molecular spin triangle (Fe3) and provide initial experimental evidence suggesting spin-electric transitions polynuclear complexes. The co-presence electric- magnetic-dipole transitions, allows us to estimate coupling. Based Hamiltonian simulations spectra,...
Mono-, di-, and trinuclear copper−azido moieties have been synthesized by varying the size of countercations. [Bu4N]+ yielded a [Cu2(N3)6]2- moiety in [Bu4N]2[Cu2(μ1,1-N3)2(N3)4], 1, [Pr4N]+ [Cu3(N3)8]2- {[Pr4N]2[Cu3(μ1,1-N3)4(N3)4]}n, 2, which symmetry-related are doubly μ1,1-azido bridged to form unprecedented infinite zigzag chains parallel crystallographic a-axis. In case [Et4N]+, mononuclear species [Et4N]2[Cu(N3)4], 3, has formed. All complexes characterized structurally single-crystal...
A new asymmetrically coordinated bis-trinuclear iron(III) cluster containing a [Fe(3)O](7+) core has been synthesized and structurally, magnetically, spectroscopically characterized. [Fe(6)Na(2)O(2)(O(2)CPh)(10)(pic)(4)(EtOH)(4)(H(2)O)(2)](ClO(4))(2).2EpsilontOH (1.2EpsilontOH) crystallizes in the P space group consists of two symmetry-related {Fe(3)O](7+) subunits linked by Na(+) cations. Inside each subunit, ions are antiferromagnetically coupled, their magnetic exchange is best described...
Complex [Ni 5{pyCOpyC(O)(OMe)py} 2(O 2CMe) 4(N 3) 4(MeOH) 2].2MeOH.2.6H 2O ( 1.2MeOH.2.6H 2O) was synthesized by the reaction of Ni(O 2.4H with pyCOpyCOpy and NaN 3 in refluxing MeOH. It crystallizes monoclinic C2/ c space group consists five Ni (II) atoms a helical arrangement. Direct current magnetic susceptibility studies reveal ferromagnetic interactions between S = 1) ions, stabilizing an 5 ground state. Alternating experiments revealed existence out-of-phase signals indicative slow...
Complexes [MIIGdIII{pyCO(OEt)pyC(OH)(OEt)py}3](ClO4)2·EtOH [MII = CuII (1), MnII (2), NiII (3), CoII (4) and ZnII (5)] crystallize in the monoclinic Cc space group contain one hexacoordinate MII ion enneacoordinate GdIII ion, bridged by three {pyCO(OEt)pyC(OH)(OEt)py}− ligands. Magnetic susceptibility measurements indicate a ferromagnetic interaction for 1 antiferromagnetic interactions 2–4. Using Ĥ −JŜGdIIIŜMII spin Hamiltonian formalism, fits to magnetic data yielded J values of +0.32 cm−1...
The use of di-2-pyridyl ketone ((py)2CO)/3,5-di-tert-butylcatechol (H2dbcat) "blend" in iron(III) chemistry has yielded a cationic tetranuclear cluster and an anionic trinuclear complex. Both complexes were prepared under anaerobic conditions. Fe(ClO4)3·6H2O–(py)2CO–H2dbcat–NEt3 (1 ∶ 1 2) reaction system MeOH gives [Fe4{(py)2C(OMe)O}2{(Hpy)(py)C(OMe)O}2(dbcat)4](ClO4)21, whereas Fe(ClO4)3·6H2O with (py)2CO, H2dbcat NEt3 3) MeCN (HNEt3)[Fe3{(py)2C(OH)O}2(dbcat)4]·MeCN 2·MeCN. centrosymmetric...
The use of salicylaldehyde oxime (H2salox) in iron(III) carboxylate chemistry has yielded two new hexanuclear compounds [Fe6(μ3-O)2(O2CPh)10(salox)2(L)2]·xMeCN·yH2O [L = MeCONH2, x 6, y 0 (1); L H2O, 2, 3 (2)]. Compound 1 crystallizes the triclinic space group P1̄ with (at 25 °C) a 13.210(8) Å, b 13.87(1) c 17.04(1) α 105.79(2)°, β 96.72(2)°, γ 116.69(2)°, V 2578.17(2) Å3, and Z 1. 2 monoclinic C2/c 21.81(1) 17.93(1) 27.72(1) 111.70(2)°, 10070(10) 4. Complexes contain [Fe6(μ3-O)2(μ2-OR)2]12+...
Abstract Aerobic reactions of Co(O 2 CR) with 2‐(hydroxymethyl)pyridine (hmpH), in the presence ClO 4 – counterions give hexanuclear, mixed‐valence clusters [Co II Co III (O (hmp) 8 ](ClO ) [R = Me ( 1 ), Ph )] which possess unprecedented (μ 3 ‐OR′) (μ‐OR′) ] 6+ [R′ (2‐pyridyl)CH ‐] core. Replacement by N reaction mixture that gives leads to linear complex III,II,III CMe) (N ). Q‐band EPR spectra and variable‐temperature magnetic susceptibility studies for provide strong evidence ions are...
Two trinuclear CuII pyrazolato complexes with a Cu3(μ3-E)-core (E = O2– or OH–) and terminal nitrite ligands in two coordination modes were characterized crystallographically, spectroscopically, electrochemically. One-electron oxidation of the μ3-O species produces delocalized, mixed-valent, formally CuII2CuIII-nitrite, but no nitrate. In contrast, under reducing conditions—addition PhSH as an electron proton donor—both mediate reduction nitrite, releasing NO.
Two molecular spin qubits are studied with pulsed electron paramagnetic resonance (EPR) spectroscopy under electric fields to assess their magnetoelectric (ME) couplings and control. [Fe3O(PhCOO)6(py)3]ClO4·py (Fe3) is characterized by strong Dzyaloshinskii-Moriya interactions (DMI) which induce important magnetoanisotropy, whereas the DMI in [Cr3O(PhCOO)6(py)3]ClO4·0.5py (Cr3) 1-2 orders of magnitude weaker. Fe3 observed demonstrate a clear ME effect, whose intensity shows an unprecedented...