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Dive into the research topics where Kamal Boubekeur is active.

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Featured researches published by Kamal Boubekeur.


Journal of the American Chemical Society | 2011

High proton conduction in a chiral ferromagnetic metal-organic quartz-like framework.

Emilio Pardo; Cyrille Train; Geoffrey Gontard; Kamal Boubekeur; Oscar Fabelo; Hongbo Liu; Brahim Dkhil; Francesc Lloret; Kosuke Nakagawa; Hiroko Tokoro; Shin-ichi Ohkoshi; Michel Verdaguer

A complex-as-ligand strategy to get a multifunctional molecular material led to a metal-organic framework with the formula (NH(4))(4)[MnCr(2)(ox)(6)]·4H(2)O. Single-crystal X-ray diffraction revealed that the anionic bimetallic coordination network adopts a chiral three-dimensional quartz-like architecture. It hosts ammonium cations and water molecules in functionalized channels. In addition to ferromagnetic ordering below T(C) = 3.0 K related to the host network, the material exhibits a very high proton conductivity of 1.1 × 10(-3) S cm(-1) at room temperature due to the guest molecules.


Angewandte Chemie | 2012

Multiferroics by Rational Design: Implementing Ferroelectricity in Molecule‐Based Magnets

Emilio Pardo; Cyrille Train; Hongbo Liu; Lise-Marie Chamoreau; Brahim Dkhil; Kamal Boubekeur; Francesc Lloret; Keitaro Nakatani; Hiroko Tokoro; Shin-ichi Ohkoshi; Michel Verdaguer

Multiferroics (MF) are materials that exhibit simultaneouslyseveral ferroic order parameters. Among the multiferroicmaterials, those combining antiferro- or ferroelectricity (FE)and antiferro-, ferri-, or ferromagnetism (FM) within thesame material are highly desirable: the coexistence of thepolar and magnetic orders paves the way towards four-levelmemories while their interactions through the magnetoelec-tric effect makes it possible to control the magnetization byelectric fields and hence to develop electronically tuneablemagnetic devices, which are an essential feature for spin-tronics.


New Journal of Chemistry | 1999

Ketones as an oxolation source for the synthesis of titanium-oxo-organoclusters

Nathalie Steunou; François Ribot; Kamal Boubekeur; Jocelyne Maquet; Clément Sanchez

Two titanium-oxo clusters, [Ti3O(OPri)7(O3C9H15)] 1 and [Ti11O13(OPri)18] 2, have been obtained through the reactions of Ti(OPri)4 with ketones such as acetone, acetylacetone and diacetone alcohol. Complex 1 is composed of a trinuclear unit that is capped by a tridentate enolate ligand synthesized insitu. Complex 2 is a more condensed titanium cluster with a spherical oxo core. The titanium-oxo-organo cores of these clusters are preserved in solution as characterized by 17O, 13C, and 1H NMR spectroscopy. The possible different reactions involved in the formation of these clusters are discussed.


CrystEngComm | 2005

The tailoring of crystal structures via the self-assembly of organic coordination compounds by N⋯I non-covalent halogen bonds: co-crystals of sterically hindered N-heterocycles and 1,4-diiodo-tetrafluorobenzene

Jean-Laurent Syssa-Magalé; Kamal Boubekeur; Pierre Palvadeau; A. Meerschaut; Bernd Schöllhorn

The N-containing heteroaromatics 2,3,5,6-tetramethylpyrazine (tmpyr), 2,2′-bipyridine (2,2′-bpy), 2,4′-bipyridine (2,4′-bpy) and o-phenanthroline (phen) were each cocrystallized with 1,4-diiodo-tetrafluoro-benzene (TFDIB). The effect of the sterically constrained aza cycles on supramolecular assembly and the crystal structure determining interactions is discussed. The N⋯I non-covalent halogen bonds are the main directing interactions responsible for the observed structures. Nevertheless, steric hindrance of the donor sites increases the impact of weaker intermolecular interactions such as CH⋯F bonding and π–π interactions provoking changes in the coordination behaviour of the donor modules. In spite of steric constraints, the co-crystals tmpyr·TFDIB (1) and 2,2′-bpy·TFDIB (2) exhibit polymeric structures consisting of infinite one-dimensional chains of alternating electron donors (D) and acceptors (A). In contrast, the structures of the cocrystals 2,4′-bpy·TFDIB (3) and phen·TFDIB (4) reveal a packing of termolecular [A1D2] complexes. It follows that the structure type of such halogen bonded supramolecular assemblies can be tuned by choosing the appropriate precursors.


Tetrahedron | 1992

Tetraformyltetrathiafulvalene (TFTTF) and acetals, precursors of polyfunctionalized TTFs.

Marc Sallé; Alain Gorgues; M. Jubault; Kamal Boubekeur; Patrick Batail

Abstract A short synthesis of 1,3-dithiol-2-thiones bearing two aldehyde functionalities, free and/or masked as diethylacetals is described. They are shown to be convenient precursors for synthesizing di- and tetraformyl-TTF. When submitted to four-fold nucleophilic attacks, the latter readily affords new substituted derivatives such as the bis-(pyridazino)-TTF 8 , the tetrakis-(hydroxymethyl)-TTF 9 and the tetravinylic-TTF 10 whose π-donor ability has been characterized.


Journal of Alloys and Compounds | 1998

A new honeycomb-like molecular compound: Gd[C6H3(COO)3](H2O)3·1.5H2O

Carole Daiguebonne; Y. Gerault; Olivier Guillou; A. Lecerf; Kamal Boubekeur; P. Batail; Myrtil L. Kahn; Olivier Kahn

The reaction in gel of Gd(lII) ions with TMA 3- , where TMA 3- stands for [C 6 H 3 (COO) 3 ] 3- has afforded single crystals of a bidimensional molecular compound formulated as Gd[TMA(H 2 O) 3 ].1.5H 2 O whose crystal structure is reported here: C2/c, a=20.454(2) A, b=9.973(1) A, c=15.251(2) A, β=125.68(1)° and Z=8. The structure consists of parallel double-sheet networks based on honeycomb-like motifs based on Gd(III) ions and TMA 3- groups. This compound exhibits a paramagnetic behaviour in the whole temperature range (2-300K).


Journal of The Chemical Society, Chemical Communications | 1989

Mixed-valence bis(ethylenedithio)tetrathiafulvalenium (BEDT-TTF) monolayers sandwiched between extended close-packed Keggin-type molecular metal oxide cluster arrays: synthesis, unprecedented acentric structure, and preliminary conducting and e.s.r. properties of (BEDT-TTF)8SiW12O40

Anne Davidson; Kamal Boubekeur; Alain Pénicaud; Pascale Auban; Christine Lenoir; Patrick Batail; Gilbert Hervé

The synthesis, acentric sandwich structure, and preliminary electronic properties of conducting plate-like single-crystals of a 3,4;3′,4-bis(ethylenedithio)-2,2′,5,5′-tetrathiafulvalene (BEDT-TTF) salt of the tetravalent 12-tungstosilicate molecular anion SiW12O404– are described as well as evidence for a correlation between the non-centrosymmetrical character of the bi-dimensional solid and that of the discrete molecular cluster anion.


Journal of Materials Chemistry | 2004

Radical cation salts of TTF derivatives incorporating the maleonitriledithiolate copper cluster anion [Cu8(i-mnt)6]4−

Sandrine Perruchas; Kamal Boubekeur; Pascale Auban-Senzier

The synthesis by electrocrystallization and X-ray crystal structures of two radical cation salts, (BEDT-TTF)6[Cu8(i-mnt)6]·(CH2Cl2)42 and (EDT-TTF)6[Cu8(i-mnt)6] 3 are described. These salts incorporate the isomaleonitriledithiolato–octa-copper(I) complex [Cu8(i-mnt)6]4− as anion and the bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF), or the ethylenedithiotetrathiafulvalene (EDT-TTF) as radical cations. The crystal structure of the starting material (n-Pr4N)4[CuI8(i-mnt)6]·(MeCN)21 is also reported. In 2, organic molecules form isolated fully oxidized (BEDT-TTF)22+ dimers and mixed valence (BEDT-TTF)21+˙ dimers, the latter assembled in chains along the a-axis. The crystal structure of 3 is composed of layers of anions and cations, the latter incorporate fully oxidized (EDT-TTF)22+ dimers and neutral EDT-TTF molecules. For both salts, interactions between organic molecules were rationalized by extended Huckel calculations. 2 exhibits a low conductivity at room temperature. This study shows that metal dithiolate clusters are a new class of anions suitable for the preparation of TTF-based molecular materials.


Tetrahedron-asymmetry | 1999

Microbiological reductions of chromen-4-one derivatives

Pascale Besse; Genevieve Baziard-Mouysset; Kamal Boubekeur; Pierre Palvadeau; Henri Veschambre; Marc Payard; Guy Mousset

Abstract From the microbiological reductions of 2-acetyl or 2-benzoylchromen-4-one both enantiomers of the corresponding alcohols were obtained with high enantiomeric excess. The absolute configurations were determined directly by an X-ray structural determination. The results obtained showed that for most of the microorganisms tested, an inversion of the configuration of the alcohol occurred with the change of the substituent (methyl to phenyl group) in position 2, but also with the presence of a bromine atom in position 6 of the aromatic ring, positioned quite far from the prochiral centre.


Journal of the American Chemical Society | 2008

Modulating the Framework Negative Charge Density in the System [BDT−TTP•+]/[Re6S5Cl91-]/[Re6(S/Se)6Cl82-]/[Re6S7Cl73-]: Templating by Isosteric Cluster Anions of Identical Symmetry and Shape, Variations of Incommensurate Band Filling, and Electronic Structure in 2D Metals

Sandrine Perruchas; Kamal Boubekeur; Enric Canadell; Yohji Misaki; Pascale Auban-Senzier; Claude Pasquier; Patrick Batail

A series of 2D metals, beta-(BDT-TTP)6[Re6Se6Cl8] x (CHCl2-CHCl2)2, 2; beta-(ST-TTP)6[Re6S6Cl8] x (CH2Cl-CHCl2)2, 3; beta-(BDT-TTP)7[Re6S6Cl8]0.5[Re6S7Cl7]0.5 x (CH2Cl2), 4; beta-(BDT-TTP)7[Re6Se6Cl8]0.5[Re6S7Cl7]0.5 x (CH2Cl2), 5; beta-(BDT-TTP)8[Re6S7Cl7] x (CH2Cl2)4, 6 (BDT-TTP and ST-TTP are 2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene and 2-(1,3-diselenol-2-ylidene)-5(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene, respectively) is reported to have one single beta-slab layered topology despite successive increases of the cluster anion negative charge. The charge density within the templating composite inorganic-neutral molecule slab is shown to remain above a threshold of ca. one negative charge per square nanometer, that is, for cluster anions with two negative charges and higher. Conversely, discrete stacks are shown to be stabilized instead in the semiconducting salts (BDT-TTP)2[Re6S5Cl9], 1 where the cluster anion bears one negative charge only. The electronic structure of salts 2-6 is shown to be very stable and kept almost intact across the series. The templating strategy is shown to fulfill its anticipated potential for deliberate installment of incommensurate band fillings in molecular metals. The deliberate admixture of the 6:1 and 8:1 structures yields novel phases with a 7:1 stoichiometry with the anticipated crystal and electronic structures. The action at the organic-inorganic interface triggered by changing the anion charge yet keeping its shape and volume identical, which ultimately governs the shape of the unit cell, is of paramount importance in defining the Fermi surface of these metallic salts. The present BDT-TTP salts thus provide a series of materials with strongly related but subtly different Fermi surfaces worthy of many physical studies. Shubnikov-de Haas measurements are expected to be particularly interesting since they are especially sensitive to the details of the Fermi surface.

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Cyrille Train

Centre national de la recherche scientifique

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Pierre Palvadeau

Centre national de la recherche scientifique

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Marc Fourmigué

Centre national de la recherche scientifique

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