ORCID Profile
0000-0001-5429-7418
Current Organisations
Université de Bordeaux
,
CNRS
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Publisher: Wiley
Date: 11-06-2019
Abstract: The synthesis and physico-chemical characterization of an Fe
Publisher: Wiley
Date: 09-12-2021
Abstract: We describe herein the self‐assembly synthesis of an octanuclear Co II [2]catenane {[Co 4 ( H 2 L ) 6 ] 2 16+ } formed by the mechanical interlocking of two {[Co 4 ( H 2 L ) 6 ] 8+ } rectangles of unprecedented topology. Subtle manipulation of the synthetic conditions allows the isolation of a mixed‐valence [Co 2 III /Co 2 II ] 10+ non‐catenated rectangle. The Co II centers in the [2]catenane exhibit slow relaxation of their magnetic moment, i. e. single‐molecule magnet properties, dominated by quantum tunneling and Raman relaxation processes. This work shows that metallo‐supramolecular chemistry can precisely control the organization of single‐molecule magnets in topologically complex arrangements.
Publisher: American Chemical Society (ACS)
Date: 28-04-2021
DOI: 10.26434/CHEMRXIV.14493756.V1
Abstract: A series of Ni(II) trinuclear complexes, [Ni 3 (sala-X) 6 ] (sala-X = o -[( p -X-phenylimino)methyl]phenol X = Br 1-Br , Me 1-Me and OMe 1-OMe ), have been prepared and fully characterised. X-ray crystallographic studies reveal that the complexes are composed of three face-sharing octahedral Ni(II) metal ions bridged by the phenoxide oxygens of the sala-X ligands. Magnetic studies indicate that the magnetic Ni(II) centres are ferromagnetically coupled with the substituent group having only a minor impact on the magnitude of coupling. DFT calculations also support ferromagnetic coupling with smaller Ni-O-Ni angles leading to slightly larger coupling constants in line with previous studies.
Publisher: American Chemical Society (ACS)
Date: 28-04-2021
DOI: 10.26434/CHEMRXIV.14493756
Abstract: A series of Ni(II) trinuclear complexes, [Ni sub /sub (sala-X) sub /sub ] (sala-X = i o /i -[( i /i -X-phenylimino)methyl]phenol X = Br b -Br /b , Me b -Me /b and OMe b -OMe /b ), have been prepared and fully characterised. X-ray crystallographic studies reveal that the complexes are composed of a three face-sharing octahedral Ni(II) metal ions bridged by the phenoxide oxygens of the sala-X ligands /a . Magnetic studies indicate that the magnetic Ni(II) centres are ferromagnetically coupled with the substituent group having only a minor impact on the magnitude of coupling. DFT calculations also support ferromagnetic coupling with smaller Ni-O-Ni angles leading to slightly larger coupling constants in line with previous studies.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1CC05043E
Abstract: A trinuclear iron cluster possesses ferromagnetically coupled high-spin Fe II centers and displays slow relaxation of the magnetization under applied field.
Publisher: American Society for Microbiology
Date: 15-02-2007
DOI: 10.1128/JB.01218-06
Abstract: The migration of the human pathogen Streptococcus pyogenes (group A streptococcus) from localized to deep tissue sites may result in severe invasive disease, and sequestration of the host zymogen plasminogen appears crucial for virulence. Here, we describe a novel plasminogen-binding M protein, the p lasminogen-binding group A streptococcal M protein (PAM)- r elated p rotein (Prp). Prp is phylogenetically distinct from previously described plasminogen-binding M proteins of group A, C, and G streptococci. While competition experiments indicate that Prp binds plasminogen with a lower affinity than PAM (50% effective concentration = 0.34 μM), Prp nonetheless binds plasminogen with high affinity and at physiologically relevant concentrations of plasminogen ( K d = 7.8 nM). Site-directed mutagenesis of the putative plasminogen binding site indicates that unlike the majority of plasminogen receptors, Prp does not interact with plasminogen exclusively via lysine residues. Mutagenesis to alanine of lysine residues Lys 96 and Lys 101 reduced but did not abrogate plasminogen binding by Prp. Plasminogen binding was abolished only with the additional mutagenesis of Arg 107 and His 108 to alanine. Furthermore, mutagenesis of Arg 107 and His 108 abolished plasminogen binding by Prp despite the presence of Lys 96 and Lys 101 in the binding site. Thus, binding to plasminogen via arginine and histidine residues appears to be a conserved mechanism among plasminogen-binding M proteins.
Publisher: Wiley
Date: 03-06-2020
Publisher: Wiley
Date: 09-12-2021
Abstract: We describe herein the self‐assembly synthesis of an octanuclear Co II [2]catenane {[Co 4 ( H 2 L ) 6 ] 2 16+ } formed by the mechanical interlocking of two {[Co 4 ( H 2 L ) 6 ] 8+ } rectangles of unprecedented topology. Subtle manipulation of the synthetic conditions allows the isolation of a mixed‐valence [Co 2 III /Co 2 II ] 10+ non‐catenated rectangle. The Co II centers in the [2]catenane exhibit slow relaxation of their magnetic moment, i. e. single‐molecule magnet properties, dominated by quantum tunneling and Raman relaxation processes. This work shows that metallo‐supramolecular chemistry can precisely control the organization of single‐molecule magnets in topologically complex arrangements.
Publisher: Wiley
Date: 12-03-2020
Publisher: Wiley
Date: 25-04-2005
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2DT31776A
Abstract: Herein we report the synthesis, structure and magnetic properties of [FeL(3)](ClO(4))(2), 1, where L is the bidentate ligand N-(4-methoxyphenyl)-1H-imidazol-2-yl-methanimine. Complex 1 crystallises as the mer-isomer which is stabilised by intramolecular π-π interactions between the methoxyphenyl 'tail' and imidazole 'head' of adjacent ligands centred around Fe(II). The crystal lattice is devoid of any significant intermolecular π-π interactions between neighbouring complexes, although hydrogen bonding between two imidazole N-H groups and two perchlorate anions links two adjacent complexes together and allows them to buttress up against one another. Structural data collected at 116 and 292 K suggest a spin-crossover (SCO) behaviour for 1 as Fe-N bond lengths increase by ca. 10% at the higher temperature. SCO behaviour is confirmed by magnetic susceptibility measurements. The χT vs. T data reveals a complete and reversible SCO for 1 with T(1/2) of 158 K, and this is further confirmed by Mössbauer spectroscopy (at 4.2 and 293 K) and variable temperature reflectivity measurements. Indeed, upon irradiation with red light (647 nm) at 10 K, 1 shows a photo-induced spin-crossover and undergoes full switching between the LS and HS states.
Publisher: American Chemical Society (ACS)
Date: 27-10-2022
DOI: 10.1021/ACS.INORGCHEM.2C02659
Abstract: Valence tautomerism (VT) and spin crossover (SCO) are promising avenues for developing a range of molecular materials for sensing, memory, and optoelectronic applications. However, these phenomena arise only when specific metal-ligand combinations are employed. The underexplored combination of cobalt(II/III) paired with bis((aryl)imino)acenapthene (Ar-BIAN) ligands, which can exist as neutral Ar-BIAN
Publisher: Elsevier BV
Date: 02-2001
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8DT03833C
Abstract: A series of tricobalt EMACs with halide axial ligands demonstrate erse spin-crossover behaviors as a function of the molecular geometry and the nature of the axial ligand.
No related grants have been discovered for Rodolphe CLERAC.