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11.
Carmen Villegas Aurel Diacon Thérèse Gorisse Lionel Derue Ingrid Freuze Magali Allain Hussein Awada Olivier Dautel Guillaume Wantz Piétrick Hudhomme 《Helvetica chimica acta》2023,106(6):e202300031
This study presents the synthesis and characterization of novel azido molecules with demonstrated crosslinking ability when used as additives in polymer/fullerene organic solar cells. These compounds derived from fullerenes C60 and C70, or dyes from perylenediimide, perylene and tetraphenylethylene frameworks, bearing a different number of azido groups, are of particular interest to stabilize and increase the thermal stability of the device morphology. In particular, the electro and photoactive dye derivatives allow the introduction of additional functionality with the possibility of extending the absorption domain of the photoactive layer. In addition, and more broadly, such azido crosslinkers could find applications in the field of optoelectronic devices as a simple and cheap strategy to improve the performance and long-term stability of organic solar cells, perovskites solar cells, or organic light-emitting diodes. 相似文献
12.
Dr. Abdalaziz Aljabour Houssein Awada Dr. Luyang Song Dr. He Sun Simon Offenthaler Farzaneh Yari Dr. Matthias Bechmann Prof. Dr. Markus Clark Scharber Prof. Dr. Wolfgang Schöfberger 《Angewandte Chemie (International ed. in English)》2023,62(21):e202302208
As alternative energy sources are essential to reach a climate-neutral economy, hydrogen peroxide (H2O2) as futuristic energy carrier gains enormous awareness. However, seeking for stable and electrochemically selective H2O2 ORR electrocatalyst is yet a challenge, making the design of—ideally—bifunctional catalysts extremely important and outmost of interest. In this study, we explore the application of a trimetallic cobalt(II) triazole pyridine bis-[cobalt(III) corrole] complex CoIITP[CoIIIC]2 3 in OER and ORR catalysis due to its remarkable physicochemical properties, fast charge transfer kinetics, electrochemical reversibility, and durability. With nearly 100 % selective catalytic activity towards the two-electron transfer generated H2O2, an ORR onset potential of 0.8 V vs RHE and a cycling stability of 50 000 cycles are detected. Similarly, promising results are obtained when applied in OER catalysis. A relatively low overpotential at 10 mA cm−2 of 412 mV, Faraday efficiency 98 % for oxygen, an outstanding Tafel slope of 64 mV dec−1 combined with superior stability. 相似文献
13.
Hussein Medlej Hussein Awada Mamatimin Abbas Guillaume Wantz Antoine Bousquet Eric Grelet Kamal Hariri Tayssir Hamieh Roger C. Hiorns Christine Dagron-Lartigau 《European Polymer Journal》2013
Dithienosilole-benzothiadiazole based low bandgap copolymers remain promising material for organic photovoltaics. A new copolymer, poly[(4,4′-dioctyldithieno[3,2-b:2′,3′-d]silole-2,6-diyl)-alt-{4,7-bis[2-(3-hexyl)thienyl]-2,1,3-benzothiadiazole-5,5′-diyl}] (PDTSDTBT) was designed by introducing a thiophene spacer bearing a hexyl chain at β-position in the main backbone and compared to its analog poly[(4,4′-dioctyldithieno[3,2-b:2′,3′-d]silole-2,6-diyl)-alt-(2,1,3-benzothiadiazole-4,7-diyl)] (PDTSBT). In PDTSDTBT, linear alkyl chains on silicon were chosen due to facile and cheap access and the inserted 3-hexylthiophene units were chosen to increase solubility and molar mass, a weak point with PDTSBT. The two parameters are important to optimize photovoltaic performances. To compare characteristics, PDTSDTBT of molar masses greater than, and equal to a sample of PDTSBT, were prepared. Pd-catalyzed Stille cross-coupling reactions in a micro-wave reactor to promote an efficient copolymerisations. A strong absorption ranging from 370 nm to 800 nm and a good thermal stability were observed. PDTSDTBT showed better solubility and higher degree of crystallinity. Facile synthesis of high molar masses meant that higher efficiencies, around 40% greater, could be obtained with PDTSDTBT. The polymer was demonstrated to be susceptible to improvement through the use of device-additives. For example, under initial optimisations using PDTSDTBT:PC60BM blend at a ratio of 1:1 delivered a power conversion efficiency of 2.13% with JSC = 7.73 (mA/cm2), under AM 1.5 (100 mW/cm2) illumination. 相似文献
14.
Tuan‐Anh Nguyen Julien Roger Houssein Nasrallah Vincent Rampazzi Sophie Fournier Hlne Cattey E. Daiann Sosa Carrizo Paul Fleurat‐Lessard Charles H. Devillers Nadine Pirio Dominique Lucas Jean‐Cyrille Hierso 《化学:亚洲杂志》2020,15(18):2879-2885
Di‐tert‐butylated‐bis(phosphino)ferrocene ligands bearing phosphino substituents R (R=phenyl, cyclohexyl, iso‐propyl, mesityl, or furyl) allow tuning the selective formation of Au(I) halide complexes. Thus, dinuclear linear two‐coordinate, but also rare mononuclear trigonal three‐coordinate and tetrahedral four‐coordinate complexes were formed upon tuning of the conditions. Both Au(I) chloride and rarer Au(I) iodide complexes were synthesized, and their X‐ray diffraction analysis are reported. The significance of the control of structure and nuclearity in Au(I) complexes is further illustrated herein by its strong effect on the efficiency and selectivity of gold‐catalysed cycloisomerization. Cationic linear digold(I) bis(dicyclohexylphosphino) ferrocenes outperform other catalysts in the demanding regioselective cycloisomerization of enyne sulphonamides into cyclohexadienes. Conversely, tetrahedral and trigonal cationic monogold(I) complexes were found incompetent for enyne cycloaddition. We used the two‐coordinate linear electron‐rich Au(I) complex 2 b (R=Cy) to extend the scope of selective intramolecular cycloaddition of different 1,6‐enyne sulfonylamines with high activity and excellent selectivity to the endo cyclohexadiene products. 相似文献
15.
Arnaud Deraemaeker Houssein Nasser 《International Journal of Solids and Structures》2010,47(24):3272-3285
This paper focuses on the evaluation of the homogeneous properties of the active layer in Macro Fiber Composite (MFC) transducers using finite element periodic homogenization. The proposed method is applied to both d31 and d33-MFCs and the results are compared to previously published analytical mixing rules, showing a good agreement. The main advantages of the finite element homogenization is the possibility to take into account local details in the representative volume element such as complicated electrode patterns or local variations of the poling direction due to curved electric field lines. Although these influences have been found to be rather small in the present study, the method presented is useful for a better understanding of the behavior of piezocomposite transducers. 相似文献
16.
Gilberto Siqueira Houssein Abdillahi Julien Bras Alain Dufresne 《Cellulose (London, England)》2010,17(2):289-298
The chemical composition and morphology of Syngonanthus nitens (Capim Dourado) fibers were investigated. An unusual low lignin content and high holocellulose content have been observed.
High aspect ratio cellulose whiskers were prepared from these lignocellulosic fibers by an acid hydrolysis treatment. The
average diameter and length were 4.5 nm and 300 nm, respectively, giving rise to an aspect ratio around 67. Natural Rubber
nanocomposite films reinforced with cellulose whiskers extracted from capim dourado were prepared by film casting. The mechanical
properties of the ensuing nanocomposite films were investigated in both the linear and the non-linear range using dynamical
mechanical analysis and tensile tests, respectively. The reinforcing effect observed above the glass transition temperature
of the matrix was higher than the one observed for other polysaccharide nanocrystals and cellulose whiskers extracted from
other sources. 相似文献
17.
Mouhamad Awada Sébastien Floquet Jérôme Marrot Mohamed Haouas Sara P. Morcillo Christophe Bour Vincent Gandon Vincent Coeffard Christine Greck Emmanuel Cadot 《Journal of Cluster Science》2017,28(2):799-812
Five new tartrate-containing Keplerate compounds have been synthesized and characterized in the solid state and in solution. These characterizations evidenced the total replacement of inner sulfate ligands by L- or D-tartrate ligands in aqueous medium under heating during several days. To our knowledge these compounds correspond to the first Keplerate molecules incorporating chiral ligands. The 1H NMR studies supported by X-ray crystallographic analysis are consistent with the coordination of 24–30 tartrates within the Mo132 capsule which are located in close vicinity. The NMR signals of the encapsulated ligands appear particularly broad which precludes the use of advanced NMR methodologies but the solid state NMR provided further characterization of ligand substitution within the capsule by carboxylates. To our knowledge it is the first time that a solid state NMR study of a Keplerate is reported in the literature. 相似文献
18.
Houssein IbrahimChloée Bournaud Régis GuillotMartial Toffano Giang Vo-Thanh 《Tetrahedron letters》2012,53(36):4900-4902
A new class of monophosphine ligands has been prepared from natural chirality renewable source, 1,4:3,6-dianhydrohexitol compounds, via a nucleophilic substitution process, or a hydrophosphination reaction involving microwave activation. These ligands have been evaluated for the rhodium-catalyzed enantioselective hydrogenation of olefins giving good conversion and enantioselectivity up to 95% and 96% ee, respectively. 相似文献
19.
Chapurina Y Ibrahim H Guillot R Kolodziej E Collin J Trifonov A Schulz E Hannedouche J 《The Journal of organic chemistry》2011,76(24):10163-10172
The in situ preparation of chiral amido alkyl ate yttrium complexes from an array of chiral N-benzyl-like-substituted binaphthyldiamines is reported. These chiral heteroleptic complexes are shown to be efficient catalysts for the enantioselective intramolecular hydroamination of primary amines tethered to sterically demanding alkenes at high reaction temperatures. Fine tuning of their chiral environment allowed up to 77% ee to be reached for the cyclization of aminoalkenes bearing 1,2-dialkyl-substituted carbon-carbon double bonds. These chiral complexes also demonstrate the ability to promote the cyclization of amine-tethered trisubstituted alkenes in up to 55% ee, as the first report of the formation of enantioenriched quaternary centers by an hydroamination reaction. 相似文献
20.
R. V. Sokolova S. P. Ermakova S. M. Awada T. N. Zvyagintseva H. M. Kanaan 《Chemistry of Natural Compounds》2011,47(3):329-334
The polysaccharide compositions of the brown algae Dictyopteris polypodioides and Sargassum sp. from the Mediterranean Sea were determined. The principal polysaccharide of the studied algae (about 12% of the dry alga
weight) was alginic acid. The content of water-soluble polysaccharides was low. The amount of fucoidan was less than 1% of
the dry alga weight; of neutral polysaccharides, less than 0.25%. The monosaccharide compositions of fucoidans and neutral
polysaccharides were investigated. Experiments on soft agar-agar models showed that fucoidans from D. polypodioides and Sargassum sp. exhibited antitumor activity against RPMI-7951 human melanoma cells. 相似文献