Recent trends in perfluorinated sulfoximines
Publication date: Available online 19 February 2018Source: Comptes Rendus ChimieAuthor(s): Anne-Laure Barthelemy, Emmanuel MagnierAbstractThe search for original perfluorinated moieties is a very modern and attractive challenge. Among the emergent groups, the S-perfluoroalkylated sulfoximines are very peculiar because of their structural diversity and promising properties. A literature survey shows that interest in these molecules is strongly increasing. This short review summarizes the recent works devoted to this topic.RésuméLa recherche de groupes fluorés originaux est un défi moderne de la chimie organique. Parmi c...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Mononuclear ferrous and ferric complexes
Publication date: Available online 24 February 2018Source: Comptes Rendus ChimieAuthor(s): Marie-Laure Boillot, Birgit WeberAbstractThis contribution reports on the recent developments concerning spin-crossover Fe(II) and Fe(III) complexes of mononuclear nature. In the first section, the description of chemical environments encountered in this iron coordination chemistry is briefly introduced. The background related to the switchability and cooperativity of the molecular materials is followed by a summary of the very first developments directed toward applications. Presently, these molecule-based systems are broadly used f...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Mesoscopic structural organization in fluorinated room temperature ionic liquids
Publication date: Available online 3 March 2018Source: Comptes Rendus ChimieAuthor(s): Fabrizio Lo Celso, Yukihiro Yoshida, Renato Lombardo, Charl Jafta, Lorenzo Gontrani, Alessandro Triolo, Olga RussinaAbstractThe presence of fluorous tails in room-temperature ionic liquids imparts new properties to their already rich spectrum of appealing features. The interest towards this class of compounds that are of ionic nature with melting point less than 25 °C is accordingly growing; in particular, compounds bearing relatively long fluorous tails have begun to be considered. In this invited presentation, we show recent results ...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Fluorine-based plasmas: Main features and application in micro-and nanotechnology and in surface treatment
Publication date: Available online 11 March 2018Source: Comptes Rendus ChimieAuthor(s): Christophe CardinaudAbstractFluorine cold plasmas produced by an electrical discharge in SF6, CF4, CHF3 or C4F8 gases, principally, have two main fields of application. The first and historical application is etching of materials for microelectronics and later for micro- and nanotechnology. The second concerns the modification of surface properties, mostly in terms of reflectance and wettability. After an introduction to cold plasmas and plasma–surface interaction principles, the article aims at presenting successively the evolution o...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Structural analysis of spin-crossover materials: From molecules to materials
This article reviews various techniques currently used, ranging from microscopy to diffraction, to study the structural aspects related to spin crossover at different physical scales. Some of the most important recent advances concern the resolution of complex crystal structures, the determination of microstructures, the study of phase coexistence, temporal studies ranging from second to femtosecond, and the description of multistep transition involving intricate ordering of molecules in different electronic states.RésuméDans les matériaux moléculaires à conversion de spin, la modification de l'état de spin est forte...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Squalene versus cholesterol: Which is the best nanocarrier for the delivery to cells of the anticancer drug gemcitabine?
Publication date: Available online 20 March 2018Source: Comptes Rendus ChimieAuthor(s): Arnaud Peramo, Simona Mura, Semen O. Yesylevskyy, Bruno Cardey, Dunja Sobot, Stephanie Denis, Christophe Ramseyer, Didier Desmaële, Patrick CouvreurAbstractIt has been previously shown that the linkage of the anticancer drug gemcitabine (Gem) to the squalene (SQ), a natural lipid precursor of the cholesterol biosynthesis, allowed the resulting bioconjugates to spontaneously self-assemble as nanoparticles (NPs) with improved pharmacological activity. We show here that when the squalene moiety was replaced by the cholesterol and the conj...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Glasses to see beyond visible
Publication date: Available online 22 March 2018Source: Comptes Rendus ChimieAuthor(s): Jacques Lucas, Johann Troles, Xiang Hua Zhang, Catherine Boussard-Pledel, Marcel Poulain, Bruno BureauAbstractGlasses transmitting in the infrared (IR) belong to the families of fluorides and chalcogenides. This brief review is dealing with the originality of these materials such as their glass-forming properties. This contribution is essentially oriented towards their applications, which are illustrated by the creation of four companies. They have found niches in the business of IR, in bringing to the market original fibres and lenses ...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Fluorine in the Earth and the solar system, where does it come from and can it be found?
Publication date: Available online 23 March 2018Source: Comptes Rendus ChimieAuthor(s): Kenneth T. Koga, Estelle F. Rose-KogaAbstractThis review (1) presents a summary of the distribution of fluorine in different fluid (surficial, subterranean, metamorphic, and magmatic–hydrothermal–geothermal) and solid (oceanic and continental crust, mantle, and core) domains of the Earth, and various extraterrestrial materials and bodies (meteorites, planets and moons, and the Sun); (2) it provides an estimate of the total fluorine abundance for the Earth and in its dominant reservoirs contributing to the Earth's fluorine endowment;...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Effect of fluorination on the stability of carbon nanofibres in organic solvents
Publication date: Available online 24 March 2018Source: Comptes Rendus ChimieAuthor(s): Nadiège Nomède-Martyr, Elodie Disa, Katia Guérin, Pierre Bonnet, Marc DuboisAbstractBeneficial effects of fluorination on the stability of carbon nanofibre (CNF) dispersion in organic solvents as a function of time are evidenced. Because of their excellent friction properties, fluorinated CNFs (CF0.85) can be used as nanoparticles of tribo-active phase in lubrication; however, they have to be added into a matrix. We have shown that mixtures of CF0.85 are more stable than CNF solutions. Investigations by ultraviolet–visible spectros...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Surfaces, thin films and patterning of spin crossover compounds
Publication date: Available online 24 March 2018Source: Comptes Rendus ChimieAuthor(s): Talal Mallah, Massimiliano CavalliniAbstractSpin crossover compounds are multifunctional switching materials that change their spin state and many other physical properties, such as colour, magnetic susceptibility, electric conductivity, dielectric constant and mechanical properties, upon external stimuli. Spin crossover materials have been proposed for a variety of technological applications that require the elaboration of highly controlled thin films and patterns. Here, we present a brief overview of the most diffused approaches for t...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Elastic models, lattice dynamics and finite size effects in molecular spin crossover systems
Publication date: Available online 24 March 2018Source: Comptes Rendus ChimieAuthor(s): Cristian Enachescu, William NicolazziAbstractThe experimental studies of spin-crossover compounds switched in the last decade from bulk measurements and macroscopic observations to the nanoscale and microscopic approaches. In this context, new and sometimes unexpected behaviours have been documented, which could be partially described only by the classical phenomenological models developed in the last period of the last century. In this context, the development of more complex models, able to reproduce the nucleation and domain propagat...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Synergies and competition between current approaches to materials discovery
Publication date: Available online 21 April 2018Source: Comptes Rendus ChimieAuthor(s): Martin JansenAbstractDiscovery of novel materials is impaired by lack of predictability of solid-state synthesis. In addressing this impediment, an approach toward rational planning of syntheses of solid state and materials is presented. Within the underlying “chemical energy landscape” concept, the whole materials world is projected onto an energy landscape, associated with a respective configuration space. Evidently, all chemical compounds possible are present in virtuo in such a landscape. For the identification of targets for sy...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
From hydrophilic to hydrophobic wood using direct fluorination: A localized treatment
Publication date: Available online 24 April 2018Source: Comptes Rendus ChimieAuthor(s): Martial Pouzet, Marc Dubois, Karine Charlet, Alexis BéakouAbstractWhen controlled by the treatment duration or the quantity of reactive molecules, direct fluorination using F2 gas is efficient to decrease the hydrophilicity of wood both in the form of massive piece and powder. To prove that silver fir pieces and wood flour (mix of spruce and silver fir species) were investigated as representative examples. In both the cases, hydroxyl groups are converted into CF bonds resulting in the decrease in affinity for water. Fluorination is mai...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
Photocatalytic and photosensitized water splitting: A plea for well-defined and commonly accepted protocol
Publication date: Available online 8 May 2018Source: Comptes Rendus ChimieAuthor(s): Arindam Indra, Prashanth W. Menezes, Matthias DriessAbstractThe amount of “free” energy provided by the sun in 1 h is more than what currently mankind uses from fossil fuels and other renewable energy sources. Water covers 71% of the earth surface, making it easily available and one of the cheapest natural resources. Therefore, the concept of sunlight-driven water splitting (oxygen and hydrogen evolution) by converting the solar energy into chemical energy could be a cheap substitute for fuels and thus is of paramount interest. Moreov...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
High activity heterogeneous catalysts by plasma-enhanced chemical vapor deposition of volatile palladium complexes on biomorphic carbon
Publication date: Available online 10 May 2018Source: Comptes Rendus ChimieAuthor(s): Lisa Czympiel, Michael Frank, Andreas Mettenbörger, Sven-Martin Hühne, Sanjay MathurAbstractSix new palladium complexes based on allyl and alkenolate ligands were synthesized and structurally characterized. Combination of delocalized allylic sp2-hybridized carbon centers and a strongly binding NˆO chelating unit (e.g., 3,3,3-trifluoro(pyridin-2-yl)propen-2-ol) offered a promising combination of high volatility and thermal lability not commonly observed in noble metal precursors. Application of the new Pd compounds in thermal metal–or...
Source: Comptes Rendus Chimie - July 5, 2018 Category: Chemistry Source Type: research
