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Dive into the research topics where Jacques Le Moigne is active.

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Featured researches published by Jacques Le Moigne.


Chemistry: A European Journal | 2001

Towards a Better Understanding of the Magnetic Interactions withinm-Phenyleneα-Nitronyl Imino Nitroxide Based Biradicals

Laure Catala; Jacques Le Moigne; Nathalie Kyritsakas; Paul Rey; Juan J. Novoa; Philippe Turek

An extensive investigation of the magnetic properties of three series of biradicals (bis-nitronyl nitroxides diNN-R, bis-imino nitroxides diIN-R and mixed INNN-R, where R is either hydrogen, a triple bond or trimethylsilylacetylenic group) has been carried out to give clear values of the intramolecular interactions through the m-phenylene coupling unit with alpha-nitronyl nitroxides (NN) or alpha-imino nitroxides (IN). An EPR study of the molecules in the isolated state is validated by ab initio calculations, which show the respective influence of spin polarisation and molecular conformation on the singlet-triplet gaps. All these results indicate that the triplet state is the ground state for such biradicals, except when the imidazolyl cycles are orthogonal to the phenyl ring. The magnetic properties of the biradicals in the solid state can be rationalised by examination of the short contacts produced between the ONCNO and ONCN groups. EPR studies on single crystals of the H-substituted series have confirmed the presence of a structural distortion for diNN-H whereas diIN-H and INNN-H do not exhibit such a peculiarity. The magnetic behaviour of diIN-H is described well by a four-spins model, with a strong intermolecular antiferromagnetic interaction of -90 K, whereas in the case of the two other compounds, a supplementary contact involves more complex interactions between the dimers. The compound diNN-tmsa exhibits a ferromagnetic intermolecular interaction of +11 K within the dimers, and this could be attributed to the relative disposition of the imidazolyl rings. Compound diNN-tr reveals a chain-like behaviour, whereas diIN-tr shows a predominant antiferromagnetic interaction within the dimers. The values for the intramolecular interactions in the solid state are in good agreement with those found for the isolated molecules.


Tetrahedron Letters | 2000

Synthesis of nitronyl- and imino-nitroxide-triradicals interconnected by phenyl ethynyl spacer

Laure Catala; Philippe Turek; Jacques Le Moigne; André De Cian; Nathalie Kyritsakas

Abstract The design and synthesis, as well as solid state and ESR characterisation of three new triradicals based on phenyl ethynyl backbone bearing nitronyl-nitroxide and imino-nitroxide groups, are reported. The synthesis of these compounds was based on palladium-coupling reactions between alkynyl and bromo derivatives. An ESR study showed magnetic interactions between the radicals through the phenyl ethynyl-coupling unit in solution.


Liquid Crystals | 1989

Acetylenic and diacetylenic liquid-crystalline monomers: towards ordered conjugated polymers

Jacques Le Moigne; Armand Soldera; Daniel Guillon; Antoine Skoulios

Abstract Acetylenic and diacetylenic mesomorphic monomers have been prepared in order to obtain long conjugated polymers able to give high non-linear optical hyperpolarizabilities. Here we report the synthesis of such monomers incorporating cholesteryl and methoxybiphenyl groups; their structural and thermal behaviour are described. The occurrence of mesophases in the acetylenic and diacetylenic derivatives is discussed as a function of the spacer length and of the size of the mesogen moiety. The diacetylenic derivatives containing the methoxybiphenyl groups do not exhibit any liquid-crystalline behaviour but are able to polymerize under U.V. radiation.


Molecular Crystals and Liquid Crystals | 1997

Magnetic Properties of Iminonitroxide and Nitronylnitroxide Based Diradicals

Pascale Wautelet; André Bieber; Philippe Turek; Jacques Le Moigne; Jean-Jacques André

Abstract The properties of a series of stable diradicals based either on iminonitroxide (IN) or nitronylnitroxide (NN) are described. Both radical fragments are coupled by various phenylene and phenylethynylene (triple bond) bridges. They are characterized by EPR studies both in solution and in glassy state. Magnetic coupling is evidenced at a very large distance between both radical fragments (up to 36 A). The intramolecular coupling is found to be antiferromagnetic in all cases and in particular for meta- or ortho- substituted phenylene. Semiempirical calculations using configuration interaction show that the linkers with triple bonds induce a stronger conjugated character than the corresponding ones involving a double bond, in agreement with the experimental optical spectra, and that the relevant geometrical parameters are the twist angles; the corresponding barriers of rotation are then evaluated. Calculations show that, for some values of the twist angle, an antiferromagnetic state may be stabilized.


Molecular Crystals and Liquid Crystals | 1995

Intramolecular Long Range Electronic Spin Exchange Coupling in Diradicals: A New Magnetic Coupling Unit

Philippe Turek; Pascale Wautelet; Jacques Le Moigne; Jean-Louis Stanger; Jean-Jacques André; André Bieber; Paul Rey; André De Cian; Jean Fischer

Abstract A phenyl diethynyl bridge is used as a magnetic coupling unit (MCU) between two iminonitroxide π-radicals. The ethynyl moiety is attached to the central phenyl ring either in the para or in the meta position. The magnetic properties of the resulting bis-imino nitroxide diradicals (p-BIN and m-BIN) are investigated both at the molecular scale and in the condensed phases. An intramolecular through bond spin coupling is observed at an unusual long distance (about 20 AS) in both derivatives. However, the ground state is found to be a singlet spin state in both compounds. The results suggest an interplay between the spin polarization and the spin delocalization (π-conjugation). An intermolecular weak antiferromagnetic spin coupling is occuring in both compounds.


Organic photonic materials and devices. Conference | 2000

Spectral characteristics of DFB polymer lasers

Vincent Dumarcher; Licinio Rocha; Christine Denis; Céline Fiorini-Debuisschert; Jean-Michel Nunzi; Frank Sobel; B. Sahraoui; Denis Gindre; Kevin P. Kretsch; Werner J. Blau; S. Pfeiffer; Hartwig Tillmann; Hans-Heinrich Hoerhold; T. Maillou; Jacques Le Moigne

We present a study of Distributed Feedback laser emission in various polymer materials. This laser scheme permits efficient control of the stimulated emission in dye doped polymer materials. Optical feedback is provided by distributed Bragg gratings formed in the film by interference patterns from the pump beam. We demonstrate broad tunability of laser emission in polymeric waveguides doped with stilbenoid, phenylene vinylene and oligomers of phenyl ethynylene used for OLEDs. Laser action was also obtained with Rhodamine 6G in PMMA deposited on surface relief grating and excited in a transverse single beam pumping geometry.


Journal of Organic Chemistry | 2003

Spin exchange interaction through phenylene-ethynylene bridge in diradicals based on iminonitroxide and nitronylnitroxide radical derivatives. 1. Experimental investigation of the through-bond spin exchange coupling.

Pascale Wautelet; Jacques Le Moigne; Vladimira Videva,†,‖ and; Philippe Turek


Archive | 1987

Temperature indicators based on polydiacetylene compounds

A. Thierry; Jacques Le Moigne


Chemistry: A European Journal | 2005

Towards a Better Understanding of Magnetic Interactions within m‐Phenylene α‐Nitronyl Nitroxide and Imino Nitroxide Based Radicals, Part III: Magnetic Exchange in a Series of Triradicals and Tetraradicals Based on the Phenyl Acetylene and Biphenyl Coupling Units

Laure Catala; Jacques Le Moigne; Nathalie Gruber; Juan J. Novoa; Pierre Rabu; Elie Belorizky; Philippe Turek


Synthesis | 2002

Synthesis of Phenyl Ethynylene Coupled Biradicals and Polyradicals Based on Galvinoxyl

Pascale Wautelet; Philippe Turek; Jacques Le Moigne

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Philippe Turek

University of Strasbourg

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A. Thierry

Centre national de la recherche scientifique

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Pascale Wautelet

Centre national de la recherche scientifique

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Laure Catala

Institut Charles Sadron

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André De Cian

Centre national de la recherche scientifique

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Daniel Guillon

Centre national de la recherche scientifique

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Paul Rey

Centre national de la recherche scientifique

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