Category: catalyst-ligand

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A robust in vitro Anticancer, Antioxidant and Antimicrobial Agents Based on New Metal-Azomethine Chelates Incorporating Ag(I), Pd (II) and VO (II) Cations: Probing the Aspects of DNA Interaction

A novel azomethine ligand (HNAP) [HNAP = 1-(Pyridin-3-yliminomethyl)-naphthalen-2-ol] and its Ag(I), Pd (II) and VO (II) chelates have been synthesized and structurally inspected using a wide range of spectroscopic and analytical tools, including infra-red (IR), ultraviolet-visible (UV-Vis) and 1H NMR spectroscopy techniques, CHN analysis, molar conductance, magnetic susceptibility, and thermogravimetric analysis. The molar conductance measurements reveal that the chelates are non-electrolytes. The thermal behavior of the investigated metal chelates shows that the hydrated, coordinated water molecules and the anions are removed in successive steps followed immediately by decomposition of the ligand in the subsequent steps. The activation thermodynamic parameters are calculated from the TG curves and discussed. Complexes formation study via continuous variation m molar ratio has been investigated, and results were consistent to those found in the solid complexes with a ratio of (M:L) as (1:1) or 1:2 (M:L) molar ratio for all the monolithic and bi-valent metal complexes with square planar for Pd (II), and Ag(I) cations while, square pyramidal geometry for VO (II) cation. DFT calculations for the titled different metal-chelates have been studied and showed a good correlation with the experimental data. The prepared compounds had been checked In vitro towards numerous sorts of plant pathogenic fungi and bacteria to evaluate their antimicrobial properties and compared with some known antibiotics. Significantly, all the complexes show excellent antimicrobial activity against various strains of bacteria and fungi, including both Gram-negative and Gram-positive bacteria. Besides, the complexes exhibited high cytotoxicity against various carcinoma cell lines, including HCT-116, MCF-7, and HepG-2. Moreover, the effect of the new synthesized compounds as antioxidants was determined by reduction of 1,1-diphenyl-2-picryl hydrazyl (DPPH) and compared with that of Vitamin C. Furthermore, the binding interactions of the complexes with CT-DNA were explored using UV-Vis spectroscopy, viscosity and gel electrophoreses measurements. They cooperatively bind to DNA possibly through intercalations. The binding ability of the complexes was shown as HNAPAg > HNAPPd > HNAPVO complex.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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A Retrospective: 10 Years of Oligo(phenylene-ethynylene) Electrolytes: Demystifying Nanomaterials

In this retrospective, we first reviewed the synthesis of the oligo(phenylene-ethynylene) electrolytes (OPEs) we created in the past 10 years. Since the general antimicrobial activity of these OPEs had been reported in our previous account in Langmuir, we are focusing only on the unusual spectroscopic and photophysical properties of these OPEs and their complexes with anionic scaffolds and detergents in this Feature Article. We applied classical all-atom MD simulations to study the hydrogen bonding environment in the water surrounding the OPEs with and without detergents present. Our finding is that OPEs could form a unit cluster or unit aggregate with a few oppositely charged detergent molecules, indicating that the photostability and photoreactivity of these OPEs might be considerably altered with important consequences to their activity as antimicrobials and fluorescence-based sensors. Thus, in the following sections, we showed that OPE complexes with detergents exhibit enhanced light-activated biocidal activity compared to either OPE or detergent individually. We also found that similar complexes between certain OPEs and biolipids could be used to construct sensors for the enzyme activity. Finally, the OPEs could covalently bind to microsphere surfaces to make a bactericidal surface, which is simpler and more ordered than the surface grafted from microspheres with polyelectrolytes. In the Conclusions and Prospects section, we briefly summarize the properties of OPEs developed so far and future areas for investigation.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Product Details of 1119-97-7, Which mentioned a new discovery about 1119-97-7

Role of kosmotrope-chaotrope interactions at micelle surfaces on the stabilization of lyotropic nematic phases

Abstract.: Three lyotropic quaternary systems of ionic surfactants were prepared to investigate the role of kosmotrope-chaotrope interactions at the micelle surfaces on stabilizing the different nematic phases. The ionic surfactants were potassium laurate (KL), sodium dodecylsulfate (SDS) and tetradecyltrimethylammonium bromide (TDTMABr), where KL is a kosmotrope surfactant, and others are chaotrope. The first system consisted of KL/decanol (DeOH)/water/alkali sulfate and the second of SDS/DeOH/water/alkali sulfate. The third system was prepared by adding sodium salts of chaotropic or kosmotropic anions to the primary mixture of TDTMABr/DeOH/water, separately. The characteristic textures of discotic nematic (ND), biaxial nematic (NB) and calamitic nematic (NC) phases were identified under polarizing light microscope. Laser conoscopy was employed to determine the uniaxial-to-biaxial phase transitions. The kosmotrope-kosmotrope or chaotrope-chaotrope interactions between the head groups of the surfactants and the ions of the electrolytes led to the stabilization of the ND phase. On the other hand, kosmotrope-chaotrope interactions stabilize the NB and/or NC phases. Graphical abstract: [Figure not available: see fulltext.]

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 2082-84-0, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.2082-84-0, Name is N,N,N-Trimethyldecan-1-aminium bromide, molecular formula is C13H30BrN. In a article£¬once mentioned of 2082-84-0

Effects of hydrophobic modification of chitosan and Nafion on transport properties, ion-exchange capacities, and enzyme immobilization

This research compares the mass transport and ion-exchange properties of two hydrophobically modified micellar polymers, chitosan and Nafion. It was shown that hydrophobically modified micellar polymers alter the transport properties of redox species to the electrode surface as a function of the size and charge of the redox species. This research details the first use of hydrophobically modified chitosan to modify electrode surfaces, along with evidence that oxidoreductase enzymes can be effectively immobilized in the polymers while maintaining enzymatic activity. Glucose oxidase was immobilized within the hydrophobically modified chitosan and the resulting enzyme activity was compared to buffer measurements and immobilization within hydrophobically modified Nafion. It was shown that the increase in hydrophobicity increases the enzyme activity, resulting in a more optimal membrane for enzyme immobilization.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application of 79815-20-6, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.79815-20-6, Name is H-Idc-OH, molecular formula is C9H9NO2. In a Article£¬once mentioned of 79815-20-6

Enantioselective Desymmetrization of Cyclobutanones Enabled by Synergistic Palladium/Enamine Catalysis

The enantioselective intramolecular alpha-arylation of cyclobutanones has been established by combining palladium and enamine catalyst systems. Two different enantioselective control strategies have been developed for cyclobutanone substrates bearing O- or N-tethered aryl bromides. Further synthetic applications are also reported.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Application In Synthesis of (S)-Diphenyl(pyrrolidin-2-yl)methanol, Which mentioned a new discovery about 112068-01-6

Control of five contiguous stereogenic centers in an organocatalytic kinetic resolution via michael/acetalization sequence: Synthesis of fully substituted tetrahydropyranols

An organocatalytic kinetic resolution of racemic secondary nitroallylic alcohols via Michael/acetalization sequence to give fully substituted tetrahydropyranols is described. The process affords the products with high to excellent stereoselectivities (up to 19.9:1.5:1 dr and 98% ee). The highly enantioenriched, less reactive (S)-nitroallylic alcohols 3 were isolated with good to high chemical yields (30-44%). The synthetic application of the resolved substrate is shown toward the synthesis of enantioenriched (+)-(2S,3R)-3-amino-2-hydroxy-4-phenylbutyric acid.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application of 41203-22-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.41203-22-9, Name is 1,4,8,11-Tetramethyl-1,4,8,11-tetraazacyclotetradecane, molecular formula is C14H32N4. In a Article£¬once mentioned of 41203-22-9

Electron-transfer Chemistry of the Luminescent Excited State of trans-Dioxo-osmium(VI)

Excitation of trans-dioxo-osmium(VI) complexes in the solid state and in fluid solutions at room temperature at 350-400 nm results in red emission with maxima at 620-710 nm.Rate constants for electron-transfer quenching of trans-2+. (L1 = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) and trans-2+. heptadeca-1(17),13,15-triene> by a series of structurally related aromatic hydrocarbons with varying redox potentials have been determined in acetonitrile.The3Eg states of trans-2+ and trans-2+ are powerful one-electron oxidants, the excited-state reduction potentials of which in acetonitrile, E0 (OsVI*-OsV), have been found to be 2.39(10) and 2.00(10) V vs. normal hydrogen electrode respectively, which agree well with estimations using spectroscopic and electrochemical data.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ COA of Formula: C27H18O6, Which mentioned a new discovery about 50446-44-1

Aluminum Metal Organic Framework Materials

The invention relates to monocrystalline single crystals of metal-organic framework materials comprising at least one aluminium metal ion, processes for preparing the same, methods for employing the same, and the use thereof. The invention also relates to monocrystalline aluminium metal-organic frameworks.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 1119-97-7, Chemistry is the experimental science by definition. We want to make observations to prove hypothesis. For this purpose, we perform experiments in the lab. 1119-97-7, Name is MitMAB,introducing its new discovery.

Preparation of nanocomposites from styrene and modified graphite oxides

Graphite oxide was prepared and modified with several ammonium salts and these modified graphite oxides were used to prepare nanocomposites with polystyrene by in situ polymerization of styrene monomer and by melt blending with polystyrene. Nanocomposites were characterized by X-ray diffraction, cone calorimetry, thermogravimetric analysis and the evaluation of mechanical properties. Nanocomposites are formed by in situ polymerization but not by melt blending; the graphite oxide undergoes thermal degradation at the temperature of melt blending so nanocomposite formation would be unlikely. Mechanical properties of the melt blended nanocomposites are improved relative to the virgin polystyrene while those prepared by in situ polymerization are decreased, except in the case of Young’s Modulus, where melt blended and in situ polymerized materials show similar results.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ HPLC of Formula: C12H28BrN, Which mentioned a new discovery about 1941-30-6

Pervaporation of acetic acid/water mixtures through silicalite filled polydimethylsiloxane membranes

The preferential pervaporation of acetic acid over water is achieved with silicalite filled polydimethylsiloxane (PDMS) membranes. The effect of silicalite addition is not positive at the feed temperature of 25C, but improves with increasing feed temperature. At a feed temperature of 45C, silicalite addition enhances not only the separation factor but also the permeation flux of the pervaporation. This improvement may be attributed to the reduction in kinetic limitation on sorption/desorption processes and the enlargement of sorption difference between acetic acid and water towards silicalite. At 25C, the sorption ratio of acetic acid to water is 3.9, but 4.9 at 45C. It is further found that at a silicalite loading of 49.9wt.%, the separation factor versus feed acetic acid concentration curve exhibits a maximum and this maximum shifts to lower feed acetic acid concentrations with increasing feed temperature. Further increasing the silicalite loading to 69.2wt.%, results in the formation of connected pores in the membrane and thus failure of the membrane in providing a separative pervaporation. The addition of silicalite is also found to enhance the thermal stability of the membrane. The pervaporation behavior of the silicalite filled PDMS membrane seems to fall in between those of pure PDMS and pure silicalite membranes. Copyright (C) 2000 Elsevier Science B.V. The preferential pervaporation of acetic acid over water is achieved with silicalite filled polydimethylsiloxane (PDMS) membranes. The effect of silicalite addition is not positive at the feed temperature of 25 C, but improves with increasing feed temperature. At a feed temperature of 45 C, silicalite addition enhances not only the separation factor but also the permeation flux of the pervaporation. This improvement may be attributed to the reduction in kinetic limitation on sorption/desorption processes and the enlargement of sorption difference between acetic acid and water towards silicalite. At 25 C, the sorption ratio of acetic acid to water is 3.9, but 4.9 at 45 C. It is further found that at a silicalite loading of 49.9 wt.%, the separation factor versus feed acetic acid concentration curve exhibits a maximum and this maximum shifts to lower feed acetic acid concentrations with increasing feed temperature. Further increasing the silicalite loading to 69.2 wt.%, results in the formation of connected pores in the membrane and thus failure of the membrane in providing a separative pervaporation. The addition of silicalite is also found to enhance the thermal stability of the membrane. The pervaporation behavior of the silicalite filled PDMS membrane seems to fall in between those of pure PDMS and pure silicalite membranes.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI