A5015215849- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Magnetism in coordination complexes
- Molecular spectroscopy and chirality
- Crystallography and molecular interactions
- Advanced NMR Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Electron Spin Resonance Studies
- Organic and Molecular Conductors Research
- Lanthanide and Transition Metal Complexes
- Porphyrin and Phthalocyanine Chemistry
- Quantum and electron transport phenomena
- Metal-Organic Frameworks: Synthesis and Applications
- Synthesis and Properties of Aromatic Compounds
- Advanced Chemical Physics Studies
- Quantum optics and atomic interactions
- Catalysis and Oxidation Reactions
- Molecular Junctions and Nanostructures
- Silicone and Siloxane Chemistry
- Axial and Atropisomeric Chirality Synthesis
- Protein Structure and Dynamics
- Laser-Matter Interactions and Applications
- Atomic and Subatomic Physics Research
- Crystal structures of chemical compounds
- Advanced X-ray Imaging Techniques
Laboratoire National des Champs Magnétiques Intenses
2019-2025
Institut National des Sciences Appliquées de Toulouse
2019-2025
Université Grenoble Alpes
2019-2025
Centre National de la Recherche Scientifique
2014-2025
University of Florence
2015-2022
National Interuniversity Consortium of Materials Science and Technology
2015-2021
National High Magnetic Field Laboratory
2019
Ghent University
2015
Université d'Angers
2014-2015
University of Cagliari
2012-2015
Implementation of modern Quantum Technologies might benefit from the remarkable quantum properties shown by molecular spin systems. In this Perspective, we highlight role that chemistry can have in current second revolution, i.e., use physics principles to create new technologies, specific case means components. Herein, briefly review status field identifying key advances recently made community, such as for example design qubits with long coherence and realization multiqubit architectures...
Here we report the investigation of magnetic relaxation and quantum coherence vanadyl phthalocyanine, VOPc, a multifunctional easy-processable potential molecular spin qubit. VOPc in its pure form (1) crystalline dispersions isostructural diamagnetic host TiOPc different stoichiometric ratios, namely VOPc:TiOPc 1:10 (2) 1:1000 (3), were investigated via multitechnique approach based on combination alternate current (AC) susceptometry, continuous wave, pulsed electron paramagnetic resonance...
In the search for long-lived quantum coherence in spin systems, vanadium(IV) complexes have shown record phase memory times among molecular systems. When nuclear spin-free ligands are employed, can show at low temperature sufficiently long times, Tm, to perform operations, but their use real devices operating room is still hampered by rapid decrease of T1 caused efficient spin–phonon coupling. this work we investigated effect different coordination environments on magnetization dynamics and...
Practical implementation of highly coherent molecular spin qubits for challenging technological applications, such as quantum information processing or sensing, requires precise organization electronic qubit components into extended frameworks. Realization spatial control over qubit–qubit distances can be achieved by coordination chemistry approaches through an appropriate choice the building blocks. However, translating single units arrays does not guarantee a priori retention long...
A multitechnique investigation of an evaporable vanadyl spin system with long-lived quantum coherence that self-assembles on gold.
Here we report the investigation of magnetization dynamics a vanadyl complex with diethyldithiocarbamate (Et2dtc–) ligands, namely [VO(Et2dtc)2] (1), in both solid-state and frozen solution. This showed an anomalous unprecedentedly observed field dependence relaxation time, which was modeled three contributions to mechanism. The temperature weight two processes dominating at low fields found well correlate energy vibrations as determined by THz spectroscopy. detailed experimental comparative...
A simple change of the substituents in bridging ligand allows tuning ordering temperatures, Tc, new family layered chiral magnets A[MIIMIII(X2An)3]·G (A = [(H3O)(phz)3]+ (phz phenazine) or NBu4+; X2An2– C6O4X22– 2,5-dihydroxy-1,4-benzoquinone derivative dianion, with MIII Cr, Fe; MII Mn, Fe, Co, etc.; X Cl, Br, I, H; G water acetone). Depending on nature X, an increase Tc from ca. 5.5 to 6.3, 8.2, and 11.0 K (for H, respectively) is observed MnCr derivative. Furthermore, presence cation...
Control of spin-lattice magnetic relaxation is crucial to observe long quantum coherence in spin systems at reasonable temperatures. Such a control most often extremely difficult achieve, because the coexistence several mechanisms, that direct, Raman, and Orbach. These are not always easy relate energy states investigated system, contribution additional spin-phonon coupling phenomena mediated by intramolecular vibrations. In this work, we have effect slight changes on molecular structure...
A molecular architecture where two vanadyl-based qubits are linked together is herein described and investigated as a platform for quantum simulation.
Vanadium(iv) complexes have recently shown record quantum spin coherence times that in several circumstances are limited by spin-lattice relaxation. The role of the environment and vibronic properties low temperature dynamics is here investigated a comparative study magnetization as function crystallite size steric hindrance β-diketonate ligands VO(acac)2 (1), VO(dpm)2 (2) VO(dbm)2 (3) evaporable (acac- = acetylacetonate, dpm- dipivaloylmethanate, dbm- dibenzoylmethanate). A pronounced...
Paramagnetic molecules can show long spin-coherence times, which make them good candidates as quantum bits (qubits). Reducing the efficiency of spin–phonon interaction is primary challenge toward achieving coherence times over a wide temperature range in soft molecular lattices. The lack microscopic understanding about role vibrations spin relaxation strongly undermines possibility chemically designing better-performing qubits. Here we report first-principles characterization main mechanism...
Here we report the first experimental observation of magneto-chiral dichroism (MChD) detected through light absorption in an enantiopure lanthanide complex. The P and M enantiomers [YbIII((X)-L)(hfac)3] (X = P, M; L 3-(2-pyridyl)-4-aza[6]-helicene; hfac 1,1,1,5,5,5-hexafluoroacetylacetonate), where chirality is held by helicene-based ligand, were studied near-infrared spectral window. When irradiated with unpolarized a magnetic field, these chiral complexes exhibit strong MChD signal (gMChD...
Here, we report the molecular self-assembly of hydroxido-bridged {Ln5Ni6} ((Ln3+ = Dy3+, Y3+) metal clusters by reaction enantiopure chiral ligands, namely, (R/S)-(2-hydroxy-3-methoxybenzyl)-serine), with NiII and LnIII precursors. Single-crystal diffraction analysis reveals that these compounds are isostructural sandwich-like 3d–4f heterometallic showing helical chirality. Direct current magnetic measurements on {Dy5Ni6} indicates ferromagnetic coupling between DyIII centers, whereas those...
The combination of physical properties sensitive to molecular chirality in a single system allows the observation fascinating phenomena such as magneto-chiral dichroism (MChD) and circularly polarized luminescence (CPL) having potential applications for optical data readout display technology. Homochiral monodimensional coordination polymers Yb
Here we report on the strong magneto-chiral dichroism (MChD) detected through visible and near-infrared light absorption up to 5.0 T {Er5Ni6} metal clusters obtained by reaction of enantiopure chiral ligands NiII ErIII precursors. Single-crystal diffraction analysis reveals that these compounds are 3d–4f heterometallic clusters, showing helical chirality. MChD spectroscopy a high gMChD dissymmetry factor ca. 0.24 T–1 (T = 4.0 K, B 1.0 T) for 4I13/2 ← 4I15/2 magnetic-dipole allowed electronic...
This Perspective reviews the Magneto-Chiral Dichroism (MChD) investigations performed on chiral lanthanide complexes, highlights crucial criteria to enhance MChD performances and presents main perspectives of this emerging field.
Magnetic materials are widely used for many technologies in energy, health, transportation, computation, and data storage. For the latter, readout of magnetic state a medium is crucial. Optical based on magneto-optical Faraday effect was commercialized but soon abandoned because need complex circular polarization-sensitive readout. Combining chirality with magnetism can remove this obstacle, as chiral exhibit magneto-chiral dichroism, differential absorption unpolarized light dependent their...
Abstract Phonons are the main source of relaxation in molecular nanomagnets, and different mechanisms have been proposed order to explain wealth experimental findings. However, very limited investigations on phonons these systems performed so far, yielding no information about their dispersions. Here we exploit state-of-the-art single-crystal inelastic neutron scattering directly measure for first time phonon dispersions a prototypical qubit. Both acoustic optical branches detected crystals...
The selection of molecular spin qubits with a long coherence time, Tm, is central task for implementing molecule-based quantum technologies. Even if sufficiently Tm can be achieved through an efficient synthetic strategy and ad hoc experimental measurement procedures, many factors contributing to the loss still need thoroughly investigated understood. Vibrational properties nuclear spins hydrogens are two them. former plays paramount role, but detailed theoretical investigation aimed at...
The interplay between chirality and magnetic fields gives rise to a cross effect referred as magneto-chiral anisotropy (MChA), which can manifest itself in different physical properties of chiral magnetized materials. first experimental demonstration MChA was by optical means with visible light. Further manifestations have been evidenced across most the electromagnetic spectrum, from terahertz X-rays. Moreover, exploiting versatility molecular chemistry toward systems, many efforts made...
By a combined theoretical and broadband nuclear magnetic resonance study, we show that [VOTPP] is coupled electronic qubit-nuclear qudit system suitable to implement qudit-based quantum error correction simulation algorithms.
Electrocrystallization of enantiopure (S,S,S,S)- and (R,R,R,R)-tetramethyl-bis(ethylenedithio)-tetrathiafulvalene (TM-BEDT-TTF) donors, as well the racemic mixture, in presence potassium cations tris(chloranilato)ferrate(III) [Fe(Cl2An)3](3-) paramagnetic anion afforded a complete series chiral magnetic molecular conductors formulated β-[(S,S,S,S)-TM-BEDT-TTF]3PPh4[K(I)Fe(III)(Cl2An)3]·3H2O (1), β-[(R,R,R,R)-TM-BEDT-TTF]3PPh4[K(I)Fe(III)(Cl2An)3]·3H2O (2),...
Electron spins are ideal two-level systems that may couple with microwave photons so that, under specific conditions, coherent spin-photon states can be realized. This represents a fundamental step for the transfer and manipulation of quantum information. Along spin impurities in solids, molecular concentrated phases have recently shown dynamics stimuli. Here we show it is possible to obtain high cooperativity regime between Vanadyl Phthalocyanine (VOPc) ensemble quality factor...
Here we report on magneto-chiral dichroism (MChD) detected with visible light the chiral Prussian Blue Analogue [MnII(X-pnH)(H2O)][CrIII(CN)6]·H2O (X = S, R; pn 1,2-propanediamine). Single crystals suitable for magneto-optical measurements were grown starting from enantiopure ligands. X-ray diffraction and magnetic confirmed 2D-layered structure of material, its absolute configuration, ferrimagnetic ordered state below a critical temperature TC 38 K. Absorption MChD spectra measured between...