A5074615449- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Luminescence and Fluorescent Materials
- Porphyrin and Phthalocyanine Chemistry
- Advanced NMR Techniques and Applications
- Organic and Molecular Conductors Research
- Electron Spin Resonance Studies
- Organometallic Complex Synthesis and Catalysis
- Synthesis and Properties of Aromatic Compounds
- Photochemistry and Electron Transfer Studies
- Crystallography and molecular interactions
- Organic Light-Emitting Diodes Research
- Molecular Sensors and Ion Detection
- Photochromic and Fluorescence Chemistry
- Metal-Catalyzed Oxygenation Mechanisms
- Metal complexes synthesis and properties
- Molecular Junctions and Nanostructures
- Inorganic Chemistry and Materials
- Synthesis and characterization of novel inorganic/organometallic compounds
- Molecular spectroscopy and chirality
- Metal-Organic Frameworks: Synthesis and Applications
- Organic Electronics and Photovoltaics
- Magnetic properties of thin films
Institut des Sciences Chimiques de Rennes
2016-2025
Université de Rennes
2016-2025
Centre National de la Recherche Scientifique
2016-2025
École Nationale Supérieure de Chimie de Rennes
2003-2024
Institut National des Sciences Appliquées de Rennes
2018-2024
Robert Bosch (Germany)
2023
Université Rennes 2
2018-2021
Centre Georges François Leclerc
2017
Institut Universitaire de France
2014
Laboratoire de Chimie
2007-2013
ConspectusCyanine derivatives, named from the Greek word kyanos meaning dark-blue, were discovered more than 150 years ago and remain one of most widely used classes organic dyes with contemporary applications in photography (panchromatic emulsions), information storage (CD-R DVD-R media) biochemistry (DNA protein labeling) fields. Cyanine chromogens consist a charged π-conjugated segment containing an odd number sp2 carbon atoms chain capped at extremities by two electronegative centers,...
Abstract The influence of nuclear spin on the magnetic hysteresis a single‐molecule is evidenced. Isotopically enriched Dy III complexes are synthesized and an isotopic dependence their relaxation observed. This approach coupled with tuning molecular environment through dilution in amorphous or isomorphous diamagnetic matrix. combination these approaches leads to dramatic enhancement memory molecule. general recipe can be efficient for rational optimization magnets (SMMs), provides important...
A redox active dinuclear complex [Yb(tta)(2)(L(1))(L(2))](2)·1.4(CH(2)Cl(2)) displays single molecule magnet behaviour with M(J) = ±7/2 ground state. The anisotropic barrier Δ is evaluated by the three dc data fit, ac analysis and emission spectrum demonstrating correlation between magnetic optical properties.
A series of push-pull donor-pi-conjugated dipicolinic acid ligands and related tris-dipicolinate europium lutetium complexes have been prepared. The present broad absorption emission transitions in the visible spectral range unambiguously assigned to charge-transfer (CT) by means time-dependent density functional theory calculations. photophysical properties (absorption, emission, luminescence quantum yield, lifetime) corresponding were thoroughly investigated. Solvatochromism temperature...
The association of heptamethine cyanine cation 1+ with various counterions A (A = Br−, I−, PF6−, SbF6−, B(C6F5)4−, TRISPHAT) was realized. six different ion pairs have been characterized by X-ray diffraction, and their absorption properties were studied in polar (DCM) apolar (toluene) solvents. small, hard anion (Br−) is able to strongly polarize the polymethine chain, resulting stabilization an asymmetric dipolar-like structure crystal nondissociating On contrary, more solvents or when it...
BODIPY dyes constitute one of the most efficient class fluorescent molecules, yet their absorption and emission signatures are hardly predictable with theoretical tools. Here, we use a robust Time-Dependent Density Functional Theory approach that simultaneously accounts for solvent vibrational effects, in order to simulate optical properties large panel derivatives. In particular, this contribution is focussed on accurate determination both 0–0 energies vibronic shapes, allow meaningful...
A series of bimetallic ruthenium complexes [{Ru(dppe)Cp*}(2)(μ-C≡CArC≡C)] featuring diethynylaromatic bridging ligands (Ar = 1,4-phenylene, 1,4-naphthylene, 9,10-anthrylene) have been prepared and some representative molecular structures determined. combination UV-vis-NIR IR spectroelectrochemical methods density functional theory (DFT) used to demonstrate that one-electron oxidation compounds [{Ru(dppe)Cp*}(2)(μ-C≡CArC≡C)](HC≡CArC≡CH 1,4-diethynylbenzene; 1,4-diethynyl-2,5-dimethoxybenzene;...
The synthesis of molecules featuring different properties is a perpetual challenge for the chemists' community. coexistence and even more synergy those open new perspectives in field molecular devices electronics. In that sense, coordination chemistry contributed to development functional through, instance, single-molecule magnets (SMMs) light emitting with potential applications high capacity data storage OLEDs, respectively. appealing combination both electronic into one single object may...
Geometry and magnetic relaxation modulations in a series of mononuclear dysprosium complexes, [DyLz2(o-vanilin)2]·X·solvent (Lz = 6-pyridin-2-yl-[1,3,5]triazine-2,4-diamine; X Br- (1), NO3- (2), CF3SO3- (3)), were realized by changing the nature counter-anion. The DyIII ions all complexes are eight-coordinate approximate D4d symmetry environments. anisotropy these systematically investigated, both experimentally from ab initio calculations. All exhibit excellent single-molecule behavior....
The [Dy(tta)3(L)] complex behaves as a single ion magnet both in its crystalline phase and solution. Experimental theoretical magnetic anisotropy axes perfectly match lie along the most electro-negative atoms of coordination sphere. Both VSM MCD measurements highlight robustness complex, with persistence memory effect even solution up to 4 K.
The modification of the axial coordination ligands Dy<sub>3</sub> + triangles results in a unique Dy<sub>6</sub> complex, which single-molecule magnet behavior and meanwhile toroidal magnetic moment ground state have been observed.
Heteroleptic C^N cyclometalated iridium(iii) complexes incorporating a monostyryl/distyryl BODIPY ligand via acetylide bonds of 2,2'-bipyridine (bpy) with both absorption (ca. ε = 8.96 × 104 M-1 cm-1, 9.89 and 7.89 cm-1 at 664 nm, 644 729 nm for Ir-2, Ir-3 Ir-4, respectively) fluorescence emission bands 624-794 Ir-1, Ir-4) in the near infra-red region (NIR) exceptionally long-lived triplet excited states (τ 156.5 μs Ir-2) have been reported. Ir(ppy)3 (Ir-0; ppy 2-phenylpyridine) was used as...
Abstract Elaborate chemical design is of utmost importance in order to slow down the relaxation dynamics single‐molecule magnets (SMMs) and hence improve their potential applications. Much interest was devoted study distinct processes related different crystal fields crystallographically independent lanthanide ions. However, assignment specific metal sites remains a challenging task. To address this challenge, new asymmetric Dy 2 SMM displaying well‐separated two‐step process with...
BODIPY and aza-BODIPY dyes constitute two key families of organic with applications in both materials science biology. Previous attempts aiming to obtain accurate theoretical estimates their optical properties, particular 0-0 energies, have failed. Here, using time-dependent density functional theory (TD-DFT), configuration interaction singles a double correction [CIS(D)], its scaled-opposite-spin variant [SOS-CIS(D)], we determined the energies as well vibronic shapes absorption emission...
Although it has been reported in a few instances that the spectroscopic properties of cyanine dyes were strongly dependent on nature chemical substitution their central carbon atom, there not to date any systematic study specifically aimed at rationalizing this behavior. In article, such is carried out an extended family 17 polymethine carrying different substituents carbon, some those being synthesized for study, similar previously compounds, sake comparison. Their absorption properties,...
Abstract A series of europium and terbium complexes based on a functionalized triazacyclononane carboxylate or phosphinate macrocyclic ligand is described. The influence the anionic group, that is, carboxylate, methylphosphinate, phenylphosphinate, photophysical properties was studied rationalized basis DFT calculated structures. nature, number, position electron‐donating electron‐withdrawing aryl substituents were varied systematically within same phenylethynyl scaffold in order to optimize...
Abstract The first dysprosium complexes with a terminal fluoride ligand are obtained as air‐stable compounds. strong, highly electrostatic dysprosium–fluoride bond generates large axial crystal‐field splitting of the J =15/2 ground state, evidenced by high‐resolution luminescence spectroscopy and correlated single‐molecule magnet behavior through experimental magnetic susceptibility data ab initio calculations.
A thermally activated delayed fluorescence (TADF) tetrametallic Cu(I) metallacycle behaves as a conformationally adaptive preorganized precursor to afford, through straightforward and rational coordination-driven supramolecular processes, variety of room-temperature solid-state luminescent polymetallic assemblies. Reacting various cyano-based building blocks with A, homometallic 1D-helical coordination polymer C Cu8M discrete circular heterobimetallic assemblies DM (M = Ni, Pd, Pt) are...
The synthesis of boron difluoride complexes a series curcuminoid derivatives containing various donor end groups is described. Time-dependent (TD)-DFT calculations confirm the charge-transfer character second lowest-energy transition band and ascribe lowest energy to "cyanine-like" transition. Photophysical studies reveal that tuning strength allows covering broad spectral range, from visible NIR region, UV-visible absorption fluorescence spectra. Two-photon-excited Z-scan techniques prove...
A one-dimensional coordination solid 1c is synthesized by reaction of a bispyridyl dithienylethene (DTE) photochromic unit with the highly anisotropic dysprosium-based single-molecule magnet [Dy(Tppy)F(pyridine)2]PF6. Slow magnetic relaxation characteristics are retained in chain compound 1c, and photoisomerization bridging DTE ligand induces single-crystal-to-single-crystal transformation that can be monitored using photocrystallography. Notably, resulting 1o exhibits faster low-temperature...
The unexpected covalent contribution in the DOTADy-OH<sub>2</sub> bond revealed by <italic>ab initio</italic> calculations of easy axis magnetization through simple H<sub>2</sub>O rotations.
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...
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.
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