Yannick Guari

Yannick Guari
French National Centre for Scientific Research | CNRS · Institut national de chimie (INC)

Doctor

About

231
Publications
26,301
Reads
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6,040
Citations
Additional affiliations
October 2012 - present
French National Centre for Scientific Research
Position
  • Research Director
January 2007 - October 2012
French National Centre for Scientific Research
Position
  • Researcher
October 1999 - January 2007
French National Centre for Scientific Research
Position
  • Researcher

Publications

Publications (231)
Article
Nanoheterostructures combining Prussian blue (PB) or Prussian blue analogues (PBA) coordination polymers with other inorganic materials onto a single nanosystem are a highly challenging and rapidly emerging class of discrete hybrid multifunctional nano-objects, where chemical and physical properties can act separately or in synergy. They present va...
Article
We report the synthesis, structures, magnetic and luminescent properties of a series of three-blade propeller homoleptic lanthanide complexes [LnL3](ClO4)3·H2O·2MeCN (Ln = Eu (1), Tb (2), Dy (3), Er (4), Yb...
Article
Full-text available
We report the synthesis of a hybrid nanocatalyst obtained through the immobilization of bio-inspired [{Mn(bpy)(H2O)}(µ-2-MeC6H4COO)2(µ-O){Mn(bpy)(NO3)}]NO3 compound into functionalized, monodispersed, mesoporous silica nanoparticles. The in situ dual functionalization sol–gel strategy adopted here leads to the synthesis of raspberry-shaped silica n...
Article
Materials developed for radionuclide adsorption need to resist harsh conditions, i.e. be robust against ionizing radiation. In this work, we evaluated the degradation of mesoporous silicas (SBA-15) grafted with hydroxypiridinone, acetamide phosphonate and propionamide phosphonate ligands under electron irradiation. The ligands contained amide and p...
Article
We report the synthesis, structures, and magnetic investigations of two new octahedral dysprosium complexes, based on the original N-heterocyclic carbene (NHC) tridentate bis(phenoxide) ligand, of the respective formulas mer-[DyL(THF)2Cl] (1) and mer-[DyL(THF)3][BPh4] (2), where L = 1,3-bis(3,5-di-tert-butyl-2-oxidophenyl)-5,5-dimethyl-3,4,5,6-tetr...
Article
Luminescence thermometry allows the remote monitoring of the temperature and holds the promise to drive the next generation of future nano or micrometric devices. Materials able to sense the temperature are usually based on one or several lanthanide ions allowing a ratiometric measurement. Optimizing the thermometric features is usually achieved th...
Article
We report the synthesis, crystal structures and magnetic investigations of four octahedral dysprosium complexes based on silanolate or stannanolate ligands of respective formula cis-[Dy(OSiPh3)2(THF)4][BPh4]•THF•C6H6 (1), cis-[Dy(OSnPh3)2(THF)4][BPh4]•THF•C6H6•C6H14 (2), fac-[Dy(OSiPh3)3(THF)3]•THF (3) and...
Article
We investigated a series of Mn2+-Prussian blue (PB) nanoparticles NazMnxFe1-x[Fe(CN)6]1-y□y·nH2O of similar size, surface state and cubic morphology with various amounts of Mn2+ synthesized through a one step self-assembly reaction. We demonstrated by a combined experimental-theoretical approach that during the synthesis, Mn2+ substituted Fe3+ up t...
Article
Full-text available
New luminescent cage-like tetranuclear silsesquioxanes [NEt4][(Ph4Si4O8)2(Tb3Eu)(NO3)4(OH)(EtOH)3(H2O)]·4(EtOH) (1) and [NEt4]2[(Ph4Si4O8)2(Tb2Eu2)(NO3)6(EtOH)2(MeCN)2]·4(MeCN) (2) present a tunable thermosensitive Tb3+-to-Eu3+ energy transfer driven by Tb3+ and Eu3+ emission and may be used as temperature sensors operating in the range 41-100 °C w...
Article
Sensors are increasingly present in the everyday life in widespread technological applications, and engineering smart systems able to simultaneously detect different physical quantities represents a scientific challenge. Taking advantage of the molecular chemistry realm that offers the possibility to finely adjust physical properties, it is demonst...
Article
This work deals with the evolution of the mesoporous structure of two silicas MCM-41 and SBA-15 under a 2 MeV electron beam as a function of the dose (0–5 GGy). For a dose of 2 GGy, the pore volume of the two materials decreases significantly by 40–45%. The irradiation-induced porosity closure is significantly more effective on smaller pores, resul...
Article
Full-text available
Ferromagnetic resonance was used to study the temperature dependence of mixed manganese-cobalt ferrite nanoparticles with a size range between 5 and 42 nm synthesized by the hydrothermal method. Structural characterization was carried out using X-ray diffraction, scanning, and transmission electron microscopy. M(H) curves as a function of the Mn2+...
Article
There is a growing interest in magnetic nanocomposites in biomaterials science. In particular, nanocomposites that combine poly(lactide) (PLA) nanofibers and superparamagnetic iron oxide nanoparticles (SPIONs), which can be obtained by either electrospinning of a SPION suspension in PLA or by precipitating SPIONs at the surface of PLA, are well doc...
Article
Full-text available
We report here a novel “one-pot” approach for the controlled growth and organization of Prussian blue nanostructures on three different surfaces: pure Au0, cysteamine-functionalized Au0, and SiO2-supported lipid bilayers with different natures of lipids. We demonstrate that fine control over the size, morphology, and the degree and homogeneity of t...
Article
A series of lanthanide dinuclear complexes and chains incorporating two derivatives of cinnamic acid (2-methoxycinnamic acid and 3-methoxycinnamic acid) have been synthesized and characterized by elemental analyses, Infra-Red Spectroscopy, X-ray diffraction, photoluminescence and magnetic measurements. The use of the 2-methoxycinnamic ligand enable...
Article
Magnetic fiber composites combining superparamagnetic iron oxide nanoparticles (SPIONs) and electrospun fibers have shown promise in tissue engineering fields. Controlled grafting of SPIONs to the fibers post-electrospinning generates biocompatible magnetic composites without altering desired fiber morphology. Here, for the first time, we assess th...
Article
We report the synthesis and structures of three luminescent dysprosium(iii) complexes based on fluorinated alkoxide ligands of formulas [Dy(L¹)2(THF)4][BPh4]·0.5THF (1), [Dy(L²)2(THF)5][BPh4]·2.5THF (2) and [Dy(L³)2(THF)5][BPh4]·2THF (3) (L¹= (CF3)3CO⁻, L²= C6F5C6F4O⁻, L³= C6F5C(CH3)O⁻). Despite the different dysprosium ion geometries (octahedralvs...
Article
The Front Cover shows a representative structure of the series of new tetranuclear Dy3+ based cage‐like silsesquioxanes that were synthesized and investigated. All of them present the characteristic green‐yellow Dy3+ emission. In addition, the Dy3+/Y3+ cage exhibits field‐induced Single Molecule Magnetic (SMM) behavior, which makes it the first mul...
Article
Full-text available
In view of potential uses in short-term thermochemical heat storage by sorption of water vapor, the capacity to release a sufficient heat amount at the appropriate rate of a Prussian blue analogue (PBA) containing hexacyanocobaltate vacancies has been compared with those of 13X type zeolites possessing Na+, Ce3+, Ce4+, or Tb3+ extra-framework compe...
Article
Tetranuclear [Ni4(CO3)4(pyridine)8·Na]Cl·pyridine·H2O compound with unusual square-planar geometry was obtained via spontaneous fixation of atmospheric CO2 and its conversion into carbonate bridging ligands. This compound exhibits a slow relaxation of the magnetization caused by a spin-glass behaviour.
Article
We report the synthesis, structures and magnetic properties of two Dy3+ heteroleptic complexes [Dy(BH4)2(THF)5][BPh4] (1) and [Dy(BH4)2(tBu4Carb)(THF)] (2) (tBu4Carb=1,3,6,8‐tetra‐tert‐butyl‐9H‐carbazole). Both complexes show a κ3‐coordination mode of the borohydride anion but distinct geometries. Whereas the cationic complex 1 does not exhibit a s...
Article
We report here the synthesis, structure, luminescence and magnetic properties of three new cage‐like tetranuclear silsesquioxanes (Et 4 N) 2 [(PhSiO 1..5 ) 8 (Y 0.75 Dy 0.25 O 1.5 ) 4 (O)(NO 2.5 ) 6 (EtOH) 2 (MeCN) 2 ] and (Cat) 2 [(PhSiO 1.5 ) 8 (DyO 1.5 ) 4 (O)(NO 2.5 ) 6 (EtOH) 2 (MeCN) 2 ] (Cat = Et 4 N or Ph 4 P). They present a characteristic...
Article
We report in this article new magneto-plasmonic core@satellites Prussian Blue Analogue (PBA)@Au-Ag nanoheterostructures obtained by using a post-synthetic impregnation of a bimetallic [AuI2AgI2(C6F5)4(OEt2)2]n molecular complex with the ferromagnetic K+/Ni2+/[Cr(CN)6]3− PBA nanoparticles. While the size, shape and structural integrity of the PBA na...
Article
We report a new octahedral [Dy(OCPh3)2(THF)4][BPh4] luminescent SMM exhibiting a massive crystal-field splitting and an anisotropic barrier of 1385 cm-1. Magnetic measurements combined with ab initio analysis reveal a novel mechanism behind the high blocking barrier based on the quench of one-phonon transitions between the three low-lying crystal-f...
Article
Full-text available
By means of muon spin relaxation measurements we unraveled the temperature spin dynamics in monodisperse maghemite spherical nanoparticles with different surface to volume ratio, in two samples with a full core (diameter D∼4 and D∼5nm) and one with a hollow core (external diameter D∼7.4nm). The behavior of the muon longitudinal relaxation rates as...
Article
Invited for the cover of this issue are Alexey N. Bilyachenko, Joulia Larionova and co‐workers at the Russian Academy of Sciences, the Peoples’ Friendship University of Russia, and University of Montpellier. The image depicts lanthanide‐based cage‐like silsesquioxanes exhibiting magnetic and luminescence properties that could constitute a particula...
Article
Luminescent lanthanide‐based silsesquioxane cages: An association of coordination and sol‐gel chemistries is a powerful tool to design new functional materials. A new family of tetranuclear lanthanide‐based cage‐like silsesquioxanes with unusual prism‐like topology was readily obtained. They exhibit efficient Eu3+ or Tb3+ characteristic emissions i...
Article
We report the synthesis, structure and magnetic properties’ investigations of a series of new dysprosium heteroleptic mono- and dinuclear complexes based on the association of chloride and different diazabutadiene (DAD2R = [2,6-iPr2C6H3N–CRCR–NC6H3iPr2-2,6]; R = H, Me) ligands showing different redox states. While using dianionic DAD2R ligands aff...
Article
We report on the synthesis, structure, magnetic and luminescence properties investigations of four new cage‐like lanthanide‐based silsesquioxanes (Cat) 2 [(PhSiO 1.5 ) 8 (LnO 1.5 ) 4 (O)(NO 2.5 ) 6 (EtOH) 2 (MeCN) 2 ] (where Cat + = Et 4 N + , PPh 4 P + and Ln 3+ = Eu 3+ Tb 3+ and (Ph 4 P) 4 [(PhSiO 1.5 ) 8 (TbO 1.5 ) 4 (O) 2 (NO 2.5 ) 8 ]•10MeCN....
Article
We report the synthesis, structure, and magnetic investigations of the new Dy3+ heteroleptic complex [Dy(tBu4Carb)(o-Me2NC6H4CH2)2]·C7H8 (1; tBu4Carb = 1,3,6,8-tetra-tert-butyl-9H-carbazole, o-Me2NC6H4CH2)2 = o-N,N-dimethylaminobenzyl). The carbazolyl ligand exhibits an unprecedented η5 πinteraction with the magnetically anisotropic dysprosium(III)...
Article
We report here the synthesis, structure, magnetic and photoluminescence properties of three new bifunctional Schiff‐base complexes [Dy(L1)2(py)2][B(Ph)4]·py (1), [Dy(L1)2Cl(DME)]·0.5DME (2) and [Dy(L2)2Cl]·2.5(C7H8) (3) (HL1 = Phenol, 2, 4‐ bis(1, 1‐ dimethylethyl) ‐ 6‐ [[(2‐ methoxy‐ 5‐ methylphenyl) imino] methyl]; HL2 = Phenol, 2, 4‐ bis(1, 1‐ d...
Article
We report the synthesis, structures, magnetic and luminescent properties of a series of heteroleptic lanthanide complexes based on a tripodal tetradentate ligand [Ln(Tpma)(NO3)3]•nMeCN (Ln = Eu (1), Tb (2), Dy (3), Er (4), n = 0.5; Yb (5), n = 0; Tpma = tris((1H-pyrazol-1-yl)methyl)amine). The europium, terbium and dysprosium analogues exhibit a la...
Article
We report the synthesis, structure and magnetic investigations of two new Dy3+ homoleptic ate-complexes based on different ene-diamido ligands [K(THF)2][Dy(DAD2R)2] (R = H (1), Me (2) DAD2R = [2,6-iPr2C6H3N–CR=CR–NC6H3iPr2-2,6 showing...
Article
We report the postsynthetic functionalization of Prussian blue (PB) nanoparticles by two different luminophores (2-aminoanthracene and rhodamine B). We show that the photoluminescence properties of the fluorophores are modified by a confinement effect upon adsorption and demonstrate that such multifunctional nanosized systems could be used for in v...
Article
We report the synthesis, photoluminescent and magnetic investigations of two octhadral dysprosium complexes [DyR2(py)4][BPh4]•2py (1) and [DyR2(THF)4][BPh4] (R = carbazolyl, py = pyridine, THF = tetrahydrofuran) exhibiting a quasi linear...
Article
Magnetoelectric (ME) materials combine magnetic and electric polarizabilities in the same phase, offering a basis for developing high-density data storage and spintronic or low-consumption devices owing to the possibility of triggering one property with the other. Such applications require strong interaction between the constitutive properties, a c...
Article
We report here two dysprosium complexes based on phenoxide-based emissive ligands 1-(2,4-dimetylphenylazo)-2-naphtholate (L1) and anthracenolate (L2). While 1 is a dinuclear homoleptic complex [Dy2(L1)6]•2C7H8 exhibiting a zero-field slow relaxation of...
Article
Full-text available
Mn ²⁺ -doped Prussian blue nanoparticles loaded with doxorubicin present high efficiency for combined photothermal and chemotherapy of cancer cells with a synergic effect under two-photon irradiation.
Article
Magnetic Cage-like metallasilsesquioxanes (CLMSs) are made of paramagnetic transition metal ions (or lanthanides) assembled through silsesquioxane ligands to build molecular architectures of different structural organization. Numerous parameters govern the magnetic properties in such systems, which range from simple paramagnetic behaviour to slow r...
Article
In this paper, a Prussian blue analogue Co[CoIII(CN)6]0.66·5.2H2O and commercial Cu-BTC and ZIF-8 materials are compared in terms of their sorption capabilities for water or hydrocarbons. Experimental and theoretical approaches were combined in order to better understand the microscopic mechanisms ruling their different sorption properties. It was...
Article
Porphyrin nanorods were prepared by ion-association between free-base meso 5,10,15,20-tetrakis-(4-N-methylpyridinium)porphyrin cations and tetraphenylborate anions. The nanorods have variable lengths (up to a few micrometers long) and diameters (∼50–500 nm). Their structure at the molecular level was elucidated by combining multinuclear solid state...
Article
Chiral separation is of critical importance in many areas spanning from pharmaceutics and agriculture to catalysis. Coordination polymers and Metal-Organic Frameworks have been envisaged for such purpose. In this study, the post-synthetic functionalization of the bidimensional Hofmann clathrate [Ni(H2O)2][Ni(CN)4] by enantiopure phenylethylamines y...
Article
Water dispersible cobalt ferrite nanoparticles, Co x Fe3-xO₄, of different size (4-10 nm) and various composition (0 ≤ x ≤ 1), functionalized with a rhamnose derivative were obtained and characterized by combining TEM, XRD and elemental analyses techniques. Magnetic properties of these systems were studied by SQUID magnetometry. A particular emphas...
Article
We report the synthesis, structure and magnetic properties investigation of a series of homoleptic Ln(III) complexes coordinated by radical-anionic iminopyridine ligands of general formula [Ln(IPy)3]•solv (IPy = iminopyridine; Ln =...
Article
We report the synthesis, structure and magnetic properties investigation of a series of heteroleptic Zn2+/Ln3+ complexes of general formula [ZnLClLn(o-van)(H2O)(NO3)]•H2O (H2L = N,N'-bis(3-methoxysalicylidene)-1,2-diaminoethane; o-van = o-vanillinate; Ln = Tb (1),...
Article
Full-text available
Two kinds of organosilica nanoparticles based on ionosilicas or neutral tertiary amino compounds have been loaded with gemcitabine monophosphate and are able to deliver the drug in cancer cells due to phosphate exchange or pH stimulus. Both nanoparticles are endocytosed in cancer cells, as monitored by fluorescence microscopy, and are very efficien...
Article
Organosilica nanoparticles hold great promise for nanomedicine applications. These nanoparticles are synthesized from polytrialkoxysilylated precursors without any silica source. In this work we present two kinds of organosilica nanoparticles with either amine or ammonium walls constituting their structure. Both types of nanoparticles are very effi...
Article
Au@Prussian-Blue Analogues (PBA) shell nanoheterostructures are multifunctional nano-objects combining optical properties (Surface Plasmon Resonance) of the Au core and magnetic properties of the PBA shell. We report in this article a series of new Au core@PBA shell nano-objects with different PBA shells: Au@K/Co/[FeII(CN)6] (2) and Au@K/Ni/[CrIII(...
Article
Full-text available
We report here a simple and efficient approach for the controlled deposition of Prussian blue analogue nanoparticles’ monolayer on a gold surface functionalised with amino groups and their characterisation by...
Article
Composites combining superparamagnetic iron oxide nanoparticles (SPIONs) and polymers are largely present in modern (bio)materials. However, while SPIONs embedded in polymer matrices are classically reported, the mechanical and degradation properties of the polymer scaffold are impacted by the SPIONs. Therefore, the controlled anchoring of SPIONs o...
Article
We report in this communication the synthesis, structure, and magnetic investigations of two new half-sandwich complexes: [Dy(DAD)Cp∗(THF)] (1) and [Li(THF) 3 ][Dy(DAD)Cp∗Cl] (2) (Cp∗: C 5 Me 5 , DAD: [2,6-iPr 2 C 6 H 3 N-CMe=CMe-NC 6 H 3 iPr2-2,6). Both compounds exhibit zero-field single-molecule magnet behavior but distinct relaxation dynamics o...
Article
We report in this communication the post-synthetic functionalization of K+/Ni2+/[Cr(CN)6]3- Prussian Blue Analogue (PBA) nanoparticles by the 2-aminoanthracene luminophore to yield a bifunctional magneto-luminescent nanosystem. The photoluminescence properties of the...
Article
We report the synthesis and magnetic investigations of a dysprosium pentagonal bipyramidal complex [Dy(THF)5Cl2][BPh4] (1) exhibiting a linear Cl-Dy-Cl sequence suitable to provide a coordination environment allowing a zero-field slow...
Article
We report the synthesis, magnetic and photoluminescence investigations of two bifunctional dysprosium complexes based on tridentate Schiff base ligands. Magnetic investigations reveal a genuine Single‐Molecule Magnet (SMM) behavior with out‐of‐phase signals up to 60 K, and the tunable emission arising from the Schiff base ligands.
Article
Porous coordination polymers are molecule‐based materials presenting a high degree of tunability, which offer many advantages for targeted applications over conventional inorganic materials. We demonstrate here that the hydrophilic‐hydrophobic character of lipophilic Prussian blue analogues may be tuned to optimize the gas adsorption properties. Th...
Article
A series of dinuclear lanthanide complexes incorporating the 2-ethoxycinnamate ligand have been synthesized and characterized by elemental analyses, Infra-Red Spectrocropy, X-ray diffraction and magnetic measurements. Depending on the nature of the lanthanide ion, three different isostructural series of respective formulas, [Ln(L)3(DMSO)(H2O)]2 (Ln...
Article
Full-text available
Careful analysis of any new nanomedicine device or disposal should be undertaken to comprehensively characterize the new product before application, so that any unintended side effect is minimized. Because of the increasing number of nanotechnology-based drugs, we can anticipate that regulatory authorities might adapt the approval process for nanom...
Article
Luminescent lanthanide-based Single-Molecule Magnets (SMM) are multifunctional molecule-based materials that combine luminescence and magnetic properties in the same crystalline structure, which can exist separately or act in synergy. Here we present a short overview focalizing on recent advances in this family of SMM and give the outlook on the fu...
Article
The first Ni(II)-based metallagermaniumsesquioxane cage compound [(PhGeO1.5)10(NiO)4(NaO0.5)2] presents a sandwich-like structure where two germsesquioxane cages are linked through {NiO}4 core and exhibits a slow dynamic of the magnetization.
Article
Full-text available
We report the synthesis, structure, and magnetic properties of a new dinuclear dysprosium(III) complex based on a 3-methoxycinnamate ligand. The centrosymmetric complex exhibits a field-induced SMM behavior. In contrast to the previously reported lanthanide-based systems with cinnamate derivatives that relax through a combination of Raman and direc...
Article
We report the synthesis, structure and magnetic properties investigation of a series of six heteroleptic complexes of general formula [Ln(Tpm)X3]•yMeCN (Tpm = tris(3,5-dimethylpyrazolyl)methane; Ln = Tb, Dy, Er; X = NO3, Cland y = 1 or 2). We demonstrate that the observation of a field-induced slow relaxation of the magnetization is highly depen...
Article
Highlights• Design of multifunctional nanoparticles able to provide efficient photothermal effect associated with imaging is highly challenging.• New Prussian blue nanoparticles compete with conventional PTT agents in terms of their efficiency and multifunctionality.• We demonstrate that Mn2+-doped Prussian blue nanoparticles act as efficient agent...
Article
We report here the synthesis and magnetic properties investigation of a luminescent trinuclear Zn2Dy Schiff-base complex that exhibits a zero-field Single-Molecule Magnet behaviour. Magneto-structural correlation confirms that the axial crystal-field...
Chapter
The physical and chemical properties of nanocomposite materials containing inorganic nanoparticles included into organic or inorganic matrices can be finely tuned for desired applications. This chapter is devoted to the description of hybrid nanocomposites based on Prussian blue-type nanoparticles included in polysaccharides matrices, such as chito...
Article
A new family of bi-, tetra-, penta-, and hexanickel cagelike phenylsilsesquioxanes 1-6 was obtained by self-assembly and transmetalation procedures. Their crystal structures were established by single-crystal X-ray analysis, and features of crystal packing relevant to the network formation were studied by a topological analysis. Compounds 1, 2, and...
Article
Full-text available
Magnetic mesoporous silica nanoparticles (M-MSNs) are a promising class of nanoparticles for drug delivery. However, a deep understanding of the toxicological mechanisms of action of these nanocarriers is essential, especially in the liver. The potential toxicity on HepaRG cells of pristine, pegylated (PEG), and lipid (DMPC) M-MSNs were compared. B...
Article
We report on the elastic properties of Ni/[Fe(CN)6] Prussian-blue-analogue nanoparticles investigated by high-pressure synchrotron X-ray diffraction and nuclear inelastic scattering. For 3 nm and 115 nm particles, we have obtained bulk moduli of (30.3 ± 3.8) GPa and (24.5 ± 3.2) GPa, with Debye sound velocities of (2496 ± 46) m s–1 and (2407 ± 38)...
Article
The effect of replacement of solvate surrounding and/or partial substitution of sodium ions in cage-like copper, sodium-phenylsilsesquioxane [(PhSiO1.5)12(CuO)4(NaO0.5)4(n-BuOH)6] 1 of “globular” structure was investigated. Synthesis of ten new derivatives of...