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Letteratura scientifica selezionata sul tema "Ruthenium-based optically pure complexes"

Autore: Grafiati

Pubblicato: 7 settembre 2024

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Articoli di riviste sul tema "Ruthenium-based optically pure complexes"

Clavero, Pau, Arnald Grabulosa, Mercè Rocamora, Guillermo Muller e Mercè Font-Bardia. "Ruthenium complexes of P-stereogenic phosphines with a heterocyclic substituent". Dalton Transactions 45, n. 20 (2016): 8513–31. http://dx.doi.org/10.1039/c6dt00995f.

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Optically pure P-stereogenic monophosphorus ligands containing a heterocyclic substituent have been prepared. They have been coordinated to Ru-η⁶-arene moieties in which the ligands act as mono- or bidentate. The complexes catalyse asymmetric transfer hydrogenation reactions with up to 70% ee.

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Genet, Jean Pierre. "Recent studies on asymmetric hydrogenation. New catalysts and synthetic applications in organic synthesis". Pure and Applied Chemistry 74, n. 1 (1 gennaio 2002): 77–83. http://dx.doi.org/10.1351/pac200274010077.

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CODRu(h3methylallyl)2 is a versatile starting material for the preparation of a wide range of chiral bisphosphines ruthenium(II) complexes: (P*P)Ru(h3methylallyl)2 2, Ru[X4(P*P)2] 3, and cationic monohydride ruthenium complex 4. A facile synthesis of new C2 electron-rich chiral phosphines, bis(phosphetano)benzene 8 and 1,1¢bis(phosphetano)ferrocene 10 is presented. Dynamic kinetic resolution was used for efficient syntheses of key components of the hexahydroazepane core 16 of balanol and of optically pure Boc-(2S,3R,3S)-iso-dolaproïne 19. Catalyst 4 was used in asymmetric hydrogenation of 22 to give (+)-cis-methyl dihydrojasmonate in high enantioselectivity.

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Morvan, Jennifer, François Vermersch, Ziyun Zhang, Laura Falivene, Thomas Vives, Vincent Dorcet, Thierry Roisnel et al. "Optically Pure C1-Symmetric Cyclic(alkyl)(amino)carbene Ruthenium Complexes for Asymmetric Olefin Metathesis". Journal of the American Chemical Society 142, n. 47 (13 novembre 2020): 19895–901. http://dx.doi.org/10.1021/jacs.0c10705.

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Bhaduri, Debjani, John H. Nelson, Tieli Wang e Robert A. Jacobson. "Syntheses and reactions of iron and ruthenium complexes of an optically pure fused cyclopentadienyl ligand". Organometallics 13, n. 6 (giugno 1994): 2291–98. http://dx.doi.org/10.1021/om00018a023.

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Ou-Yang, J. K., N. Saleh, G. Fernandez Garcia, L. Norel, F. Pointillart, T. Guizouarn, O. Cador et al. "Improved slow magnetic relaxation in optically pure helicene-based DyIII single molecule magnets". Chemical Communications 52, n. 100 (2016): 14474–77. http://dx.doi.org/10.1039/c6cc08638a.

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Caspar, Régis, Léna Musatkina, Alexander Tatosyan, Hani Amouri, Michel Gruselle, Carine Guyard-Duhayon, Raphaël Duval e Christine Cordier. "Efficient DNA Binding by Optically Pure Ruthenium Tris(bipyridyl) Complexes Incorporating Carboxylic Functionalities. Solution and Structural Analysis". Inorganic Chemistry 43, n. 25 (dicembre 2004): 7986–93. http://dx.doi.org/10.1021/ic0494657.

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Matsushima, Yuji, Nobuko Komatsuzaki, Yoshiki Ajioka, Mari Yamamoto, Hidetomo Kikuchi, Yasuyuki Takata, Noriko Dodo, Kiyotaka Onitsuka, Mitsunari Uno e Shigetoshi Takahashi. "Synthesis and Properties of Planar-Chiral (η6-Benzene)(η5-cyclopentadienyl)ruthenium(II) Complexes in an Optically Pure Form". Bulletin of the Chemical Society of Japan 74, n. 3 (marzo 2001): 527–37. http://dx.doi.org/10.1246/bcsj.74.527.

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Fei, Bao-Li, Shuangyan Tu, Zuzhuang Wei, Pingping Wang, Jian-Ying Long, Chunhua Qiao e Zhen-Feng Chen. "Biological evaluation of optically pure chiral binuclear copper(ii) complexes based on a rosin derivative as highly potential anticancer agents". Dalton Transactions 48, n. 41 (2019): 15646–56. http://dx.doi.org/10.1039/c9dt01942a.

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Piehler, Torsten, e Arne Lützen. "Enantiomerically Pure C2-symmetric Dinuclear Silver(I) and Copper(I) Complexes from a Bis(2,2´-bipyridine)-substituted 9,9´-Spirobifluorene Ligand". Zeitschrift für Naturforschung B 65, n. 3 (1 marzo 2010): 329–36. http://dx.doi.org/10.1515/znb-2010-0316.

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We have prepared a new bis(bipyridyl) ligand 1 based on a chiral 9,9´-spirobifluorene core in both enantiomerically pure forms. This ligand was found to undergo diastereoselective self-assembly to optically pure dinuclear coordination compounds upon coordination to copper(I) and silver(I) ions. Surprisingly, however, the resulting diastereomer was not found to be D2-symmetric which is usually found for similar bis(bidentate) ligands, but rather C2-symmetric with differently configurated metal centers.

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Nasriddinov, Abulkosim, Sergey Tokarev, Olga Fedorova, Ivan Bozhev e Marina Rumyantseva. "In2O3 Based Hybrid Materials: Interplay between Microstructure, Photoelectrical and Light Activated NO2 Sensor Properties". Chemosensors 10, n. 4 (4 aprile 2022): 135. http://dx.doi.org/10.3390/chemosensors10040135.

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In this work, organic–inorganic hybrids based on nanocrystalline indium oxide and ruthenium (II) heteroleptic complexes were used as sensitive materials for room temperature light-activated NO2 detection. In2O3 was obtained by chemical precipitation method and then annealed at three different temperatures (T = 300, 500, 700 °C) in order to investigate the influence of the microstructure of indium oxide on sensor characteristics of hybrid materials and on kinetics of the rise and fall of photoconductivity. The results of the X-ray phase analysis demonstrated that the obtained materials are single-phase with a cubic bixbyite structure. The Ru (II) heteroleptic complex, which was used as a photosensitizer, made it possible to shift the optical sensitivity range of the hybrids to the low energy region of the spectrum and to use a low-power LED (λmax = 470 nm) source for the photoactivation process. The sensor properties were investigated toward NO2 at sub-ppm range at room temperature. It was found that for pure oxides, the sensor signal correlates with a specific surface area, while for hybrid materials, both the sensor signal and photoresponse increase with increasing the matrix crystallinity. In this case, the main role is played by traps of nonequilibrium charge carriers, which are structural defects in the matrix.

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Più fonti

Tesi sul tema "Ruthenium-based optically pure complexes"

Talcik, Jakub. "Conception de catalyseurs chiraux de ruthénium à base de carbènes alkyles amino cycliques (CAACs) pour la métathèse asymétrique des oléfines". Electronic Thesis or Diss., Université de Rennes (2023-....), 2024. http://www.theses.fr/2024URENC001.

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La métathèse des oléfines est une réaction emblématique de la chimie verte pour la formation de nouvelles doubles liaisons carbone-carbone. Permettant une grande économie d’atome et la réduction du nombre d’étapes de synthèse, cette réaction offre des atouts incontestables pour la production de molécules d’intérêts. Ainsi, une multitude de complexes de ruthénium ont été développés depuis les années 1990 avec pour objectif d’étendre les champs d’applications de la métathèse. Si des avancées majeures ont été accomplies au niveau de l’activité et de la stabilité de ces précatalyseurs, le contrôle de la sélectivité de la réaction lors de la formation de centres stéréogènes constitue toujours un réel défi. C’est dans ce contexte que s’inscrivent ces travaux de thèse.Ainsi, deux nouvelles familles de complexes de ruthénium contenant des ligands Carbènes Alkyl Amino Cycliques (CAACs) chiraux ont été développées. Les complexes à base de CAACs associant une chiralité centrée et une chiralité axiale ont permis d’obtenir d’excellentes énantiosélectivités allant jusqu’à 99% ee en métathèse croisée par ouverture de cycle (AROCM). Les complexes CAACs de type Blechert ont, quant à eux, permis de combiner une remarquable activité à des charges catalytiques en deçà de 0.05 mol% et d’excellentes énantiosélectivités (95% ee). Enfin, une nouvelle classe de ligands CAACs contenant un motif barrélène (CABCs) a été développée et évaluée dans diverses réactions de métathèse
Olefin metathesis is an important reaction of green chemistry for the formation of new carbon-carbon double bonds. Allowing a better atom economy and shortening synthetic pathways, this technology offers many advantages for the production of highly valuable molecules. Thus, numerous ruthenium-based complexes have been developed since the 1990s aiming to extend the field of application of metathesis. While major advances were reached in terms of activity and stability of these precatalysts, controlling the selectivity of the reaction during the formation of stereogenic centers is still a major challenge.Hence, in this PhD thesis, two new families of chiral Cyclic alkylaminocarbenes (CAAC)-based ruthenium complexes were developed. Complexes containing CAACs that combined both centered and axial chirality enabled to achieve excellent enantioselectivities up to 99% ee in Asymmetric ring-opening cross metathesis (AROCM). Blechert type CAAC-Ru complexes reached remarkable activity at loadings below 0.05 mol% with very high enantioselectivities (95% ee). Finally, a novel class of CAAC family ligands carrying a barrelene scaffold (CABCs) was studied and the associated Ru complexes were evaluated across various metathesis reactions

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Atti di convegni sul tema "Ruthenium-based optically pure complexes"

Zhao, S. N., H. Chang, J. Wei e Z. Wei. "Pseudo-Color Coded Optical System Based on the Spatial Light Modulator and Charge-Coupled Device". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86642.

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A new pseudo-color coded optical system based on the liquid crystal spatial light modulator (LC-SLM) and a digital camera (CCD) is proposed. The SLM is used to replace the holographic grating with gray-scale image information, a gray-scale image in real-time modulation methods is proposed by synthesizing phase hologram and Ronchi grating, combined with the 4f coherent optical processing system and spatial filtering. For the high resolution gray image processed with existing digital pseudo-color method, the color sensitivity is low, algorithm is very complex. For traditional optical pseudo-color method, the gray scale image needs chemical pretreatment. The process is complex and time-consuming, and the real-time modulation could not be achieved. Our new method has enhanced the flexibility and adaptability of the optical pseudo-color, and give full play to the high sensitivity, high-capacity, rich colors and other features of the optical processing mode. At the same time, it overcomes the disadvantages of pure optical system which could not perform real-time processing. Therefore, it can be widely used in the field of remote sensing, biomedical, environmental monitoring, public security and criminal investigation, etc.

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Salmela, Juha, Sanna Haavisto, Antti Koponen, Ari Jäsberg e Markku Kataja. "Rheological Characterization of Micro-Fibrillated Cellulose Fibre Suspensions Using Multi Scale Velocity Profile Measurements". In Advances in Pulp and Paper Research, Cambridge 2013, a cura di S. J. I’ Anson. Fundamental Research Committee (FRC), Manchester, 2013. http://dx.doi.org/10.15376/frc.2013.1.495.

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A rheometric method based on velocity pro ling simultaneously by optical coherence tomography and the ultrasound velocity profilometry was introduced and used in a preliminary study of the rheological and boundary layer ow properties of micro fibrillated cellulose. The two velocity pro ling methods appear adequate and complementary for rheological characterization of opaque complex fluids. The ultrasound method is useful in measuring the velocity profile in the interior parts of the tube, while the optical technique is capable of high-resolution measurement of the boundary layer ow close to the tube wall. The preliminary results obtained for a 0.4% micro-fibrillated cellulose suspension show typical shear thinning behaviour in the interior part of the tube while the near wall behaviour shows existence of a slip layer of thickness ~200 m. Both the velocity profile measurement and the imaging mode data obtained by the optical coherence tomographic method indicate that the slip layer is related to a concentration gradient appearing near the tube wall. In a sublayer of thickness ~100 m, the fluid appears nearly Newtonian, and the viscosity value approaches that of pure water with decreasing distance from the wall.

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Du, H., S. H. Ng, K. T. Neo, M. Ng, I. S. Altman, S. Chiruvolu, N. Kambe, R. Mosso e K. Drain. "Inorganic-Polymer Nanocomposites for Optical Applications". In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17088.

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The combination of organic and inorganic materials forms unique composites with properties that neither of the two components provides. Such functional materials are considered innovative advanced materials that enable applications in many fields, including optics, electronics, separation membranes, protective coatings, catalysis, sensors, biotechnology, and others. The challenge of incorporating inorganic particles into an organic matrix still remains today, especially for nanoparticles, due to the difficulties in their dispersion, de-agglomeration and surface modification. NanoGram has pioneered a nanomaterials synthesis technology based on laser pyrolysis process to produce a wide range of crystalline nanomaterials including complex metal oxides, nitrides and sulfides and with precisely controlled compositions, crystal structure, particle size and size distributions. In this paper we will present some examples of nanocomposites prepared using different polymer host materials and phase-pure rutile TiO2. The inorganic component can be dispersed at higher 50 weight percent into the polymer matrix. We have demonstrated a 0.2–0.3 increase of refractive index in the composite over that of host polymer while maintaining high optical transparency. These nanocomposites can be used in a range of applications or optical devices, such as planar waveguides, flat panel displays, optical sensors, high-brightness LEDs, diffraction gratings and optical data storage. Experimental data on TiO2 nanoparticle characterization, dispersion technique, surface modification and will be presented and nanocomposite properties discussed.

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Zhang, Feng, Feng Yang, Dong Lin e Chi Zhou. "Parameter Study on 3D-Printing Graphene Oxidize Based on Directional Freezing". In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8846.

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Graphene is one of the most promising carbon nanomaterial due to its excellent electrical, thermal, optical and mechanical properties. However, it is still very challenging to unlock its exotic properties and widely adopt it in real-world applications. In this paper, we introduces a new 3D graphene structure printing approach with pure graphene oxide material, better inter-layer bonding, and complex architecture printing capability. Various parameters related to this novel process are discussed in detail in order to improve the printability, reliability and accuracy. We have shown that the print quality largely depends on the duty cycle of print head, applied pressure and travel velocity during printing. A palette of printed samples are presented to demonstrate the effectiveness of the proposed technique along with the optimal parameter settings. The proposed process proves to be a promising 3D printing technique for fabricating multi-scale nanomaterial structures. The theory revealed and parameters investigated herein are expected to significantly advance the knowledge and understanding of the fundamental mechanism of the proposed directional freezing based 3D nano printing process. Furthermore the outcome of this research has the potential to open up a new avenue for fabricating multi-functional nanomaterial objects.

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Berten, Olivier, Patrick Hendrick, Alberto Villar e David Seveno. "Using a Lubrication Test Bench for Testing New Oil Quality Sensors". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94980.

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The Université Libre de Bruxelles/ Aero-Thermo-Mechanics Department (ULB/ATM) has developed a flow bench used to mimic the complete behaviour of an aircraft gas turbine engine lubrication system. This test bench has been improved to be fully instrumented and is really multi-purposes in order to test different lubrication devices in the supply circuit (pure oil) or in the scavenge part (two-phase flow) simulating real flight conditions (oil flow rate, oil temperature and pressure…). The paper will first present the characteristics of the lubrication test bench and its capabilities. In a second part, it will be presented the integration and the test results of two different types of sensors into the lubrication test bench. One sensor is based on measuring the change in frequency of a quartz crystal resonator. The other one is composed of two optical sensors, which are able to monitor different properties of the oil and also to detect particles in the oil.

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Gao, G., L. Pershin e J. Mostaghimi. "Optical Emission Spectroscopic Diagnostics of Atmospheric Argon Radio Frequency Inductively Coupled Plasma". In ITSC2003, a cura di Basil R. Marple e Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p1337.

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Abstract An experimental study is conducted to determine the property fields of 40 MHz argon radio frequency inductively coupled plasma using optical emission spectroscopy. The pure argon plasma was operated at the input power of 0.3 kW and under atmospheric pressure. 29 atomic argon lines with upper level energies ranging from 12.9 to 15.5 eV, continuum emission and line width are used to evaluate plasma parameters such as temperature and electron number density. Since 40 MHz plasma is in almost complete nonequilibrium, the validaty and accuracy of most usual spectroscopic methods are questioned. Analysis based on the Boltzmann diagram, line-to-continuum intensity ratio, population of continuum extrapolated level, and continuum intensity reveals the departure from thermodynamic equilibrium in the plasma. Among these methods, the Boltzmann diagram method is shown to provide reliable plasma excitation temperature as long as the Boltzmann plot is drawn based on enough spectra lines covering from infrared to ultraviolet regions. The continuum emission at wavelengths within visible region can give good estimation of the electron density by using excitation temperature in the continuum relation. The line-to-continuum is not a reliable method for the temperature measurement of nonequilibrim plasma. The electron density obtained from the Saha plot can provide rough estimation of the electron density. It is shown that the electron-atom interaction contribution to the continuum radiation is more important than being expected before for the argon plasma in our study. The non-axisymmetric distribution of the emission was found to exist within the coil zone of the plasma, which may affect the estimation of the local emission coefficient, and consequently the measured plasma fields.

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Sergiienko, Ruslan, Roman Serhiiko, Volodymyr Shcheretskyi, Anatolii Verkhovliuk, Oleksandr Shcheretskyi, Ievgen Byba e Oleksandr Roik. "Structure and physical-mechanical properties of cast heat-resistant FeNiCrCuAl high-entropy alloys". In IXth INTERNATIONAL SAMSONOV CONFERENCE “MATERIALS SCIENCE OF REFRACTORY COMPOUNDS”. Frantsevich Ukrainian Materials Research Society, 2024. http://dx.doi.org/10.62564/m4-rs1734.

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The crystal lattice of high-entropy alloys (HEAs) undergoes significant deformation, that is why HEAs have high strength, significant wear resistance and corrosion resistance in environments with high chemical activity [1]. This work was aimed at creating new heat-resistant high-entropy alloys, based on inexpensive elements and prepared from common master-alloys, studying their phase composition and structure, as well as determining their physical-mechanical properties. FeNiCrCuAl alloys do not contain such an expensive element as cobalt (Co), which is usually present in similar metallic systems. FeNiCrCuAl high-entropy alloys were made from a mixture of pure metals (Cu, Ni, Al), low-carbon ferrochromium (FeCr70C1), stainless steel (GX10CrNiMn-18-9-1) and cast iron (content, wt.%: C = 2.60, Si =1.80, Mn = 1.30, Ni = 17.00, Cr = 2.30, Cu = 3.60, S = 0.05, P = 0.07). The investigated alloys were prepared by lost foam and sand mold casting methods. The phase composition of the as-cast FeNiCrCuAl alloys is represented by three phases: BCC-ordered solid solution of type B2, FCC solid solution and complex carbides (FeCr)₇C₃. Carbides were formed due to the presence of carbon in the charge materials such as cast iron (C = 2.6 wt. %) and stainless steel (C = 0.1 wt. %). A wide number of different meltings were performed therefore the chemical composition of the alloys fluctuated and the period of the BCC lattice parameter varied from 2.8859 Å to 2.8983 Å, and the FCC lattice parameter was from 3.6406 Å to 3.6666 Å. The microstructural analysis of the optical photographs revealed that the structure of the alloys was heterogeneous and consisted of granular and lamellar dendrites and interdendritic space. The HEAs of the FeNiCrCuAl system are characterized by relatively high hardness and samples suffered brittle failure during tensile tests due to the presence of carbides and BCC phase. The Brinell hardness and tensile strength in the as-cast alloys were in the range of 275 HB to 415 HB and from 300 MPa to 748 MPa, respectively.

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