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Accueil du site > Equipes > J.P. SUTTER

J.P. SUTTER

Mise en ligne effectuee par Jean-Pascal Sutter, Virginie Bereau

Matériaux Moléculaires et Supramoléculaires

GIF - 631 octets
GIF - 1 ko

EQUIPE

- Responsable

SUTTER Jean-Pascal (DR-CNRS)

- Permanents

  • BEREAU Virginie (MdC-HDR)
  • DUHAYON Carine (IR-CNRS)
  • PICHON Céline (CR-CNRS)
  • ROQUES Nans (MdC)

- Post-doctorants, doctorants et stagiaires

  • KHODJA Walid (Doctorant)
  • BRETOSH Kateryna (Doctorante)

Anciens membres permanents de l’équipe

  • COSTES Jean-Pierre (DR-CNRS)
  • TUCHAGUES Jean-Pierre (PR émérite)

Anciens post-doctorants de l’équipe

  • BAR Arun Kumar (05/2013 - 04/2015)
  • GOGOI Nayan (11/2009 - 09/2011)
  • THENGARAI Venkatakrishnan (03/2005 - 04/2007)
  • BREFUEL Nicolas (09/2006 - 08/2007)
  • THETIOT Franck (10/2005 - 08/2007)

Anciens doctorants de l’équipe

  • GUALINO Marion (10/2012 - 09/2015)
  • EL REZ Bahjat (10/2011 - 10/2014)
  • MAKSOUD Mahmoud (10/2010 - 10/2013)
  • MOUCHAHAM Georges (11/2009 - 10/2012)
  • MOUSAVI Maliheh (10/2008 - 12/2011)
  • MILON Julie (11/2004 - 05/2008)

 

PRESENTATION

Un aspect contemporain de la chimie supramoléculaire concerne la conception d’organisations aux propriétés chimiques, physiques et/ou structurales remarquables. De telles caractéristiques confèrent une identité au composé, il devient matériau. Notre approche de l’élaboration de tels matériaux supramoléculaires est fondée sur l’assemblage spontané de briques (ou modules) moléculaires préformées par le biais de liaisons de coordination, de liaisons-H, etc. Nous suivons cette approche pour concevoir et élaborer des édifices fonctionnels dont les propriétés sont liées à l’organisation supramoléculaire, au champ de ligand , à l’anisotropie, à l’interaction d’échange, ou encore aux caractéristiques géométriques des ions de transition et des lanthanides.

A l’interface de la chimie et de la physique, nous explorons des propriétés en relation avec l’électronique moléculaire - transition de spin, interaction d’échange - pour réaliser des aimants et des nano-aimants de type SMM-SCM (Single Molecule/Chain Magnets), des solides caractérisés pas une bi-stabilité magnétique ou chromatique.

Nous concevons également des solides microporeux aux propriétés zéolitiques spécifiques sur le principe d’un assemblage moléculaire par le biais de liaisons hydrogène fortes (liaisons-H ioniques).

La conception de briques moléculaires adaptées, leurs organisations en édifices supramoléculaires, l’étude des propriétés et leur modélisation constituent nos voies accès à ce domaine de recherche fascinant. Ces nouveaux matériaux sont développés dans des perspectives d’application (stockage de l’information, capteurs, stockage de gaz, ...).

 

THEMES DE RECHERCHE

- Plaquette des activités de l’équipe

 

PUBLICATIONS

- 2016

- 2010-2015

 

- HIGHLIGHTS 2016

  • Ising-Type Magnetic Anisotropy and Slow Relaxation of the Magnetization in Four-Coordinate Amido-Pyridine Fe(II) Complexes

A family of four-coordinate FeII complexes formed with N,N-chelating amido-pyridine ligands was synthesized, and their magnetic properties were investigated. These distorted tetrahedral complexes exhibit significant magnetic anisotropy with zero-field splitting parameter D ranging between −17 and −12 cm-1. Ab initio calculations revealed that a reduced N−Fe−N angle involving the chelating nitrogen atoms of the ligands is at the origin of the negative D value and that the torsion between the two N−Fe−N planes imposed by steric hindrances further increases the |D| value. Field-induced slow relaxation of magnetization was observed for the three compounds, and a single-molecule magnet behavior with an energy barrier for magnetization flipping (Ueff) of 27 cm-1 could be evidenced for one of them.

BMP - 539.3 ko

Read more : http://dx.doi.org/10.1021/acs.inorg...

 

  • Novel bi-compartmental Schiff-base with peripheral ester functionalization

A novel ester-functionalized bi-compartmental Schiff-base ligand and its dinuclear Zn-Ln complexes [Ln = Dy (1), Tb (2), Gd (3)] have been investigated. Although electron-withdrawing substituents at the para position of the phenol moieties do not change the coordination environment of the Ln centers in comparison with the non-functionalized ligand, they have a clear steric effect on the crystal packing and alter the coordination strength of the central ligand core. This is illustrated by the atypical reactivity of the bi-compartmental Schiff-base ligand towards Ln coordination and corroborated by its longer bond lengths to the rare-earth ions in comparison with the non-functionalized ligand. A slow relaxation of the magnetization with an energy barrier of 96 K was found for Dy derivative 1 in zero field.

BMP - 573.8 ko

Read more : http://dx.doi.org/10.1002/ejic.201600924

 

  • 2p-3d-4f hetero-tri-spin molecule-based magnetic compounds

The promising magnetic behavior of heterospin systems has spurred the research of 2p–3d–4f heterotri-spin compounds. Such a magnetic system has crucial advantages : the strongest possible magnetic interactions resulting from the direct binding of the radicals to the metal ions, access to strong magnetic anisotropies arising from 4f ions, and novel magnetic behavior derived from the synergic or competitive magnetic interactions between three different spin carriers. In this paper co-authored with Prof. Licun Li (Nankai University) recent advances made toward a rational development of 2p–3d–4f complexes are reviewed. Special attention is given to the 2p–3d–4f compounds exhibiting slow magnetic relaxation.

BMP - 1.2 Mo

Read more :  : http://xlink.rsc.org/?doi=C6QI00075D

 

  • Magnetic Anisotropy in Two- to Eight-coordinated Transition-Metal Complexes : Recent Developments in Molecular Magnetism

In this paper we review the most recent experimental developments in the magnetic anisotropy of mono-nuclear transition metal complexes in various coordination environments. Two- to eight-coordinated complexes are considered on the basis of low temperature evaluations of their anisotropy by magnetic studies. In particular, we focus on studies performed to determine slow magnetic relaxation processes, i.e., single-molecule magnet (SMM) behavior. We discuss the effects of electronic configurations and symmetry on magnetic anisotropy and associated dynamic magnetic properties. Exemplary use of well characterized mononuclear complexes with strong magnetic anisotropy as building units for the preparation of polynuclear SMMs and single chain magnets (SCMs), is addressed in a special section.

PNG - 42.8 ko

Read more : http://dx.doi.org/10.1016/j.ccr.201...

 

- HIGHLIGHTS 2015

  • Single-ion magnet behaviour of heptacoordinated Fe(II) complexes : on the importance of supramolecular organization

Supramolecular organization of a metal complex may significantly contribute to the magnetization dynamics of mononuclear SMMs. This has been illustrated for a heptacoordinated Fe(II) complex with rather moderate Ising-type anisotropy (D = -11 cm-1) for which slow magnetization relaxation with significant energy barrier (Ueff = 49 K) was reached when this complex was properly organized in the crystal lattice. Incidentally, it is the first example of single-ion magnet behavior for Fe(II) in pentagonal bipyramid surrounding.

PNG - 44.3 ko

Read more : http://xlink.rsc.org/?doi=C4CC10182K

 

  • On the importance of ferromagnetic exchange between transition metals in field-free SMMs : example of ring-shaped hetero-trimetallic [(LnNi2)W(CN)8]2 compounds

Rare case of genuine (i.e. field-free) SMM has been found for mixed 3d-4f-5d ring-shaped compounds with Tb(III) (Ueff/kB = 23.0 K) or Dy(III) (Ueff/kB = 26.4 K). The ferromagnetic interactions between the transition metals are shown to play an essential role in this feature. More importantly, the present results suggest that 3d-4f SMMs with enlarged energy barriers for magnetization reversal can be expected when polynuclear units of transition metal ions, with substantial ferromagnetic interactions between them, are interacting with the anisotropic 4f centres.

PNG - 36.1 ko

Read more : http://xlink.rsc.org/?doi=C5CC01743B

 

  • From ZIF-8@Al2O3 composites to self-supported ZIF-8 one-dimensional superstructures

Self-supported 1D superstructures of microporous ZIF-8 have been efficiently obtained by sequential growth of nano-crystals within the channels of Anodized Aluminum Oxide membranes and subsequent dissolution of the matrix.

PNG - 33 ko

Read more : http://dx.doi.org/10.1021/acs.cgd.5...

 

  • Magneto-Structural Variety of New 3d-4f-4(5)d Heterotrimetallic Complexes
PNG - 88.4 ko

Read more : http://xlink.rsc.org/?doi=c5dt01738f

 

  • Analysis of the Role of Peripheral Ligands Coordinated to ZnII in Enhancing the Energy Barrier in Luminescent Linear Trinuclear Zn-Dy-Zn Single-Molecule Magnets

Cationic Schiff-base complexes (see figure) behave as field-free single-molecule magnets (SMMs) with effective energy barriers (Ueff) for the reversal of the magnetization of 96.9(6) K, 146.8(5) K, and 146.1(10) K for compounds with Zn-OH2, Zn-Br, and Zn-Cl motifs, respectively. Under an applied dc magnetic field of 1000 Oe, the quantum tunneling of magnetization (QTM) is partly or fully suppressed and the energy barriers increase to Ueff=128.6(5) K for 1, Ueff=214.7 K for 2, and Ueff=202.4 K for 3. Ab initio calculations support the easy-axis anisotropy of the ground Kramers doublet and predict zero-field SMM behavior through Orbach and TA-QTM relaxations via the first excited Kramers doublet, which leads to large energy barriers.

PNG - 11.2 ko

Read more : http://dx.doi.org/10.1002/chem.201501500

 

  • Supramolecular open-framework architectures based on dicarboxylate H-bond acceptors and polytopic cations with three/four N-H+ donor units

Supramolecular assemblages based on anionic H-acceptors and cationic H-donors have been envisioned to elaborate open frameworks maintained by ionic H-bonds. Combinations of di-anionic chloranilate (CA2-), oxalate (Ox2-), or terephtalate (BDC2-) and trisimidazolium or tetrapyridinium derivatives (respectively three and four N-H+ donors), yielded open framework architectures. Their assembling patterns and framework dimensionalities are mainly governed by the chemical features of the cation.

PNG - 18.6 ko

Read more : http://xlink.rsc.org/?doi=C5CE01070E

 

- HIGHLIGHTS antérieurs

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