First nanoparticles of Bechgaard salts

Valade

et al. 2016

Fr. Ukr. J. Chem.

Self Cite

Ionic liquids are used for controlling the growth of organic conductors as nanoparticles. We review the conditions of preparation of nanoparticles of conductors derived from tetrathiafulvalene (TTF), tetramethyltetraselenafulvalene (TMTSF) and bis-ethylenedithiotetrathiafulvalene (BEDT-TTF). They are prepared by electrocrystallization using an ionic liquid supporting electrolyte in which the cation plays the role of growth controller and the anion enters the composition of the expected organic conductor. Stable suspensions of nanoparticles are obtained in one case, a valuable characteristic for potential applications in electronic devices.

mentioning

confidence: 78%

“…show that the use of ionic liquids as supporting electrolytes has no consequence on the chemical composition of the isolated materials ( Table 2) [8].…”

Section: Raman Studies Of the Nanoparticle Powdersmentioning

confidence: 99%

Adjusting the cation and anion nature in ionic liquids used for the growth control of nanoparticles of organic conductors

Valade

et al. 2016

Fr. Ukr. J. Chem.

Self Cite

“…The IR spectrum for the particles grown under these conditions ( Figure S6 in the Supporting Information) is identical to that reported previously. [18] (TMTSF) 2 ClO 4 Nanoparticles (TMTSF) 2 ClO 4 was the first organic superconductor at ambient pressure with a T c at 1.3 K. [19] As for (TMTSF) 2 -PF 6 , NPs of (TMTSF) 2 ClO 4 have previously been isolated by electrolysis in the presence of the long-chain ammonium salt [Me(n-Oct) 3 N]ClO 4 , which acts as both the supporting electrolyte and the stabilizer.…”

Section: Ttf[ni(dmit) 2 ] 2 Nanoparticlesmentioning

confidence: 97%

“…[17] NPs of (TMTSF) 2 PF 6 have previously been isolated by electrolysis in the presence of (BMIM)PF 6 , which acts as both the supporting electrolyte and the stabilizer. [18] We have followed similar concentration conditions (TMTSF/IL = 1:10) and have investigated the influence of the current intensity on the shape and size of NPs. The electrolysis was conducted at constant current.…”

Section: Ttf[ni(dmit) 2 ] 2 Nanoparticlesmentioning

confidence: 99%

“…[2a, 18] We have investigated their preparation in the presence of nBu 4 NClO 4 or [Me(n-Oct) 3 -N]ClO 4 as the supporting electrolyte and neutral long-chain molecules as the stabilizers (Table 1 (Figure 5, a). [18] Nevertheless, in the presence of the longer alkyl-chain amine (hexadecylamine), spherical 35 nm diameter nanoparticles were obtained ( Figure 5, b).…”

Section: Ttf[ni(dmit) 2 ] 2 Nanoparticlesmentioning

confidence: 99%

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Four Molecular Superconductors Isolated as Nanoparticles

Valade

et al. 2014

Eur J Inorg Chem

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Upon reduction of a 1H‐cyclobuta[de]naphthalene‐4,5‐diylbis(diarylmethylium) species, a new CC bond is formed between the Cα and Cortho atoms of the two chromophores, which presents an unprecedented coupling pattern for the dimerization of two trityl units. By attaching an annulated cyclobutane ring at the opposite peri position of the naphthalene core, the distance between the Cα carbon atoms was elongated beyond the limit of σ‐bond formation through “scissor effects”. The suppression of CαCα bond formation, which would lead to hexaphenylethane‐type compounds, is key to the first successful isolation of the α,o‐adducts. The 5‐diarylmethylene‐6‐triarylmethyl‐1,3‐cyclohexadiene unit in the α,o‐adducts is stable, and isomerization of the cyclohexadiene unit into an aromatic system was not observed. The newly formed CαCortho bond was cleaved upon two‐electron oxidation to regenerate the dicationic dye.

Nanoparticles of Molecular Conductors and Superconductors: Progress Over the Last Ten Years

Jacob

et al. 2020

Eur J Inorg Chem

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We review conditions for growing molecular conductors and superconductors as nanoparticles, an attractive morphology for integrating them into electronic components or composite materials. Although the one‐dimensional character of these materials does not favor their growth as spheroidal objects, by adding growth controlling molecules to the reaction mixture, we succeeded in growing particles from 2 to 50 nm in size for fourteen systems. The choice of the growth controller depends on the nature of the chemical interactions it can establish with the reactive species to limit growth, and on the chemical or electrochemical synthesis procedure. We show that the chemical nature of the nanoparticles is alike single crystals. Due to resistive boundaries, conducting properties of nanoparticle powders are alike microcrystalline powders. Nevertheless, superconductivity occurs in three of the studied materials. The potential application of these nanomaterials is reported in four fields: composite materials, field‐effect transistors, thermoelectric components and biomedical materials.