Yves Mollier

SYNTHESE ET ETUDE ELECTROCHIMIQUE DE POLY(ALKYL-3 SELENOPHENES)

Abstract Synthesis of 3-alkyl selenophenes via chloromethyl ketones and acetylenic chlorhydrins is described. The electropolymerisation yields electroactive and soluble polymers with high conductivity in the doped state.

Ethers d'enols β-lithies; synthese d'aldehydes α-ethyleniques

Abstract β-Bromoenol ethers readily undergo bromine-lithium exchange with t-butyllithium in ether or THF at −70°C. The resulting lithium products react with aldehydes and ketones to produce, after hydrolysis, β-hydroxyenol ethers (basic medium) or α-unsaturated aldehydes (acidic medium).

Synthese d'une nouvelle classe de donneurs: Bis(selenopyrannylidenes)-4:4′(BSeP)

Abstract We report here the first synthetic method to reach biselenopyranylidenes derivatives from either the selenopyrylium ions or the corresponding selenopyranethiones. TCNQ and DDQ complexes are described.

Etude structurale des chalcogenochromones

Abstract Preparation of tellurochromone led us to complete a comparative structural study of the four chalcogenochromones, based on various physical methods (IR, UV, dipole moments, 1 H and 13 C NMR), and on comparison with the corresponding chromanones.

Transition metal complexes derived from multisulfur ligands

Abstract Dithiolato-nickel complexes are synthesized with several donors. The oxidation can be carried out with chemical or electrochemical methods. The formation of π donor-acceptor complexes with TTF and BEDT-TTF leads to highly conductive materials. A highly conducting mixed valence salt [Ni(dmbit) 2 ](NBu 4 ) 030 complex is also prepared.

SYNTHESE DIRECTE DE METHYL-3 ET DE DIMETHYL-2,4 SELENOPHENES ET TELLUROPHENES

Abstract 3-Methyl and 2,4-dimethyl selenophenes and tellurophenes can be prepared in a convenient synthesis from acetylenic chlorohydrins without the need for hydrogen selenide and telluride.

Organic Conductors - Synthesis and Physical Properties of 4:4′-Bi(pyranylidenes) and Bi(chalcogenopyranylidenes): Charge Transfer Complexes and Radical Ion Salts

Abstract This review describes the synthesis of electron π donors in the 4:4′-bi(pyranylidenes), 4:4′-bi(thiopyranylidenes), 2:2′-bi(thiopyranylidenes), 4:4′-bi(selenopyranylidenes), 4:4′-bi(telluropyranylidenes) series symmetrically substituted at the α, α′-positions of the heteroatom. Some selected properties of these compounds are included (oxidation potentials, spectroscopic data, crystal structures) and the optical, magnetic and electrical characteristics of the charge transfer complexes and radical ion salts derived from these electron donors have been collected and are discussed.

Conducteurs organiques: Preparation et Caracterisation de Sels a Transfert de Charge de bis(selenopyrannylidenes)-4:4’ Avec L'iode

Abstract Radical cation salts of 2,2′,6,6′-tetra(methyl and aryl)-4,4′-biselenopyranylidenes, are prepared by direct iodine oxidation. Several polyiodide salts are isolated (from each donor), the stoichiometries of which are a function of molecular ratio of the reagents. The salts are investigated by optical absorption spectroscopy (between 0.025 and 4.94 eV) and conductivity measurement determined on compressed pellets at room temperature. Optical spectra show peculiar absorption peaks: above 1 eV, intramolecular and isovalent transition peaks and between 0.25 and 0.99 eV, for the complexes with low iodine stoichiometry, and intervalence charge-transfer transition band relative to a transition between neutral donor and radical-cation. This band is characteristic of a mixed valence state. The degree of charge-transfer increases when the iodine stoichiometry increases for a given substituent with a subsequent decrease of the electrical conductivity attributed to an augmentation of the Coulombs repulsions....

‘Organic metals’: complex formation of 1,2-dithiole derivatives with tetracyanoquinodimethane or tetrathiosquarate salts

Some organic charge-transfer complexes have been prepared with 1,2-dithiolylium derivatives and tetracyanoquinodimethane (TCNQ) or tetrathiosquarate salts; the complexes with TCNQ have a conductivity of ca. 0·4 Ω–1 cm–1.

Conducteurs Organiques: Synthèse, structure et études physiques de sels de l'anion radical du tétracyanoquinodiméthane avec des cations dithiole-1, 2 ylium et disélénole-1, 2 ylium

Abstract New TCNQ anion radical salts with various 1.2-dithiolylium and the bi(3.5-dimethylamino) 1.2-diselenolylium cations have been prepared. The conductivity values, determined on compacted powder are about 10−1 - 10−4 (Ω cm)−1 for 1 : 1 stoichiometry salts and about 0,5 (Ω cm)−1 for complex salts whose optical spectra exhibit a peak around 3000 cm−1 characteristic of monodimensional organic conductors. Optical conductivity, from reflectivity measurements, for bi(3,5-dimethylamino)-1,2-diselenolylium-TCNQ 1 : 2 is equal to 385 (Ω cm)−1. RX structures of 5-t-butyl-3-methylthio-1,2-dithiolylium-TCNQ 1 : 2 and 3-p-methoxyphenyl-1,2 dithiolylium-TCNQ 2 : 3 show segregated stacks for counterion and TCNQ molecules with zig-zag chains for 1 : 2 salts and triadic chains for 2 : 3 salt. The room temperature value of stack axis conductivity of 5-t-butyl-3-methylthio-1,2-dithiolylium-TCNQ 1 : 2 is 4 (Ω cm)−1. The temperature dependence of the conductivity of simple crystal correspond to a semi-conductor material...