Bulky alkylaminophenol chelates with high potential for functionalization
Publication date: Available online 24 August 2018Source: Comptes Rendus ChimieAuthor(s): Monika Olesiejuk, Karolina Bakalorz, Tomasz Krawczyk, Nikodem KuźnikAbstractAminophenols are an important class of N,O-ligands, particularly for the coordination of first-row transition metals. While their structural and electronic character and the additional possibility of bioactivation are well appreciated in coordination chemistry, particularly of responsive systems, the synthesis of the more branched and structurally demanding models is still a challenge. Therefore, the synthesis of bulky bis(hydroxybenzyl)-N’-(aminopyridyl)pro...
Source: Comptes Rendus Chimie - August 25, 2018 Category: Chemistry Source Type: research
Polynuclear Fe(II) complexes: Di/trinuclear molecules and coordination networks
Publication date: Available online 23 August 2018Source: Comptes Rendus ChimieAuthor(s): Jose Ramón Galán Mascarós, Guillem Aromí, Mohanad DarawshehAbstractWe review here the recent progress made in the synthesis of spin crossover (SCO) Fe(II) coordination complexes with two or three metal atoms, as well as coordination polymers, with the main focus on that in the last five years. We discuss these as well as their magnetic properties to derive magnetostructural correlations. This manuscript is organized through the ligand types that serve to produce the various coordination systems presented. The ligand structure and e...
Source: Comptes Rendus Chimie - August 24, 2018 Category: Chemistry Source Type: research
A novel magnetic biosorbent prepared using an oak shell waste material as an efficient adsorbent for consecutive removal of Pb2+, Ag+, Ba2+, Sr2+, and CrO42− from aqueous solutions
Publication date: Available online 23 August 2018Source: Comptes Rendus ChimieAuthor(s): Maryam Adibmehr, Hossein FaghihianAbstractIn this research, the performance of a new biosorbent prepared using low-cost oak shell waste materials for consecutive removal of particular cations and chromate anions from aqueous solutions was studied. The adsorbent impregnated with Pb2+, Ag+, Ba2+, and Sr2+ was used to remove chromate anions by the formation of an appropriate insoluble precipitate. The biosorbent was characterized by FTIR, XRD, SEM, TG-DTG, and VSM techniques. The adsorption capacities of 133.84, 53.12, 50.12, and 40.39 m...
Source: Comptes Rendus Chimie - August 23, 2018 Category: Chemistry Source Type: research
Facile synthesis of nanoparticles of the molecule-based superconductor κ-(BEDT-TTF)2Cu(NCS)2
Publication date: Available online 17 August 2018Source: Comptes Rendus ChimieAuthor(s): Benoît Cormary, Christophe Faulmann, Dominique de Caro, Lydie Valade, Pascale de Caro, Belén Ballesteros, Jordi FraxedasAbstractWell-dispersed roughly spherical nano-objects of the molecule-based superconductor κ-(BEDT-TTF)2Cu(NCS)2 have been prepared in an organic solution by using an easy synthetic route. Long alkyl-chain aconitate esters have been used as growth controlling agents. Nano-objects exhibiting sizes in the 35–120 nm range are made of aggregated individual smaller nanoparticles ranging from 3 to 10 nm. Nanoparticle...
Source: Comptes Rendus Chimie - August 18, 2018 Category: Chemistry Source Type: research
A practical and highly efficient transfer hydrogenation of aryl azides using a [Ru(p-cymene)Cl2]2 catalyst and sodium borohydride
Publication date: Available online 14 August 2018Source: Comptes Rendus ChimieAuthor(s): Benan Kilbas, Yunus Emre Yilmaz, Sinem ErgenAbstractVarious aniline derivatives were synthesized by selective reduction of aryl azides in the presence of a dichloro(p-cymene)ruthenium(II) dimer ([Ru(p-cymene)Cl2]2) via hydrolysis of sodium borohydride. The hydrogenation reactions were carried out in aqueous media at room temperature. Most of the reactions were completed within 10 min with quantitative yields.Graphical abstract (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - August 14, 2018 Category: Chemistry Source Type: research
Design and development of several polymeric metal–organic frameworks, spectral characterization, and their antimicrobial activity
Publication date: Available online 7 August 2018Source: Comptes Rendus ChimieAuthor(s): Shamim Ahmad Khan, Shahnawaz Ahmad Bhat, Shahab A.A. Nami, Abdul Kareem, Nahid NishatAbstractCoordination polymers were obtained by the reaction of metal acetates, M(CH3COO)2·xH2O {where M = Mn(II), Co(II), Ni(II) and Cu(II)} with AFP ligand (AFP = 5,5'-(piperazine-1,4-diylbis(methylene))bis(2-aminobenzoic acid). The AFP ligand was prepared by the one-pot, two-step reaction of formaldehyde, 2-aminobenzoic acid, and piperazine. Structural and spectroscopic properties have been studied by elemental, spectral (FT-IR, 1H NMR, 13C NMR, ...
Source: Comptes Rendus Chimie - August 8, 2018 Category: Chemistry Source Type: research
Extraction and refinement of agricultural plant fibers for composites manufacturing
This article reviews chemical treatments, which have been used to extract and refine fibers both from purpose-grown fiber crops, such as hemp and flax, and agricultural waste such as coconut husks and pineapple leaves. The treatments are discussed in terms of changes in the mechanical properties and surface chemistry of the fibers. (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - August 1, 2018 Category: Chemistry Source Type: research
Molecular electronics: Scanning tunneling microscopy and single-molecule devices
Publication date: Available online 17 July 2018Source: Comptes Rendus ChimieAuthor(s): Amandine Bellec, Jérôme Lagoute, Vincent RepainAbstractAmong switchable molecules, spin-crossover molecules are particularly appealing for molecular electronics as their change in spin state is associated with a large change in conductance and can also be used for molecular spintronic devices. In this article, we review the techniques that allow one to measure the electronic transport through single spin-crossover molecules. We particularly emphasize recent experiments using scanning tunneling microscopy and spectroscopy, where the spi...
Source: Comptes Rendus Chimie - July 18, 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 11, 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 11, 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 11, 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 11, 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 11, 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 11, 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 11, 2018 Category: Chemistry Source Type: research
