A5017111955- Nanocluster Synthesis and Applications
- Nanomaterials for catalytic reactions
- Catalytic Processes in Materials Science
- Asymmetric Hydrogenation and Catalysis
- Catalytic Cross-Coupling Reactions
- Synthetic Organic Chemistry Methods
- Crystallization and Solubility Studies
- Catalytic Alkyne Reactions
- X-ray Diffraction in Crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Oxidative Organic Chemistry Reactions
- Catalytic C–H Functionalization Methods
- Electrocatalysts for Energy Conversion
- Catalysis and Oxidation Reactions
- Organometallic Complex Synthesis and Catalysis
- Synthesis and Reactions of Organic Compounds
- Chemical Synthesis and Reactions
- Catalysis and Hydrodesulfurization Studies
- Chemical Synthesis and Analysis
- Fluorine in Organic Chemistry
- Asymmetric Synthesis and Catalysis
- Synthesis and Catalytic Reactions
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Synthesis and Biological Evaluation
- Advanced Polymer Synthesis and Characterization
Instituto de Tecnología Química
2016-2025
Consejo Superior de Investigaciones Científicas
2016-2025
Universitat Politècnica de València
2016-2025
Lawrence Berkeley National Laboratory
2018-2025
Centro Médico Sanitas Valencia
2016-2020
Universitat de València
2011-2012
Johns Hopkins University
1976
Quality Research
1974
Agricultural Research Service
1974
Beltsville Agricultural Research Center
1972
Very small gold clusters (3 to 10 atoms) formed from conventional salts and complexes can catalyze various organic reactions at room temperature, even when present concentrations of parts per billion. Absorption emission ultraviolet-visible spectroscopy matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry revealed that, for example, the ester-assisted hydration alkynes began only three five atoms were formed. The turnover numbers frequencies associated with these...
Elite cliques: Palladium clusters with three and four atoms were found to be the catalytically active species for ligand-free palladium-catalyzed CC bond-forming reactions. These palladium cluster could stabilized in water stored long periods of time use on demand no loss activity. High yields products turnover frequencies (TOFs) up 10(5) h(-1) observed.
The assumption that oxidative addition is the key step during cross-coupling reaction of aryl halides has led to development a plethora increasingly complex metal catalysts, thereby obviating in many cases exact influence base, which simple, inexpensive, and necessary reagent for this paramount transformation. Here, combined experimental computational study shows not single kinetically relevant different reactions catalyzed by sub-nanometer Pt or Pd species, since reactivity control shifted...
Metal single-atom catalysts (SACs) promise great rewards in terms of metal atom efficiency. However, the requirement particular conditions and supports for their synthesis, together with need solvents additives catalytic implementation, often precludes use under industrially viable conditions. Here, we show that palladium single atoms are spontaneously formed after dissolving tiny amounts salts neat benzyl alcohols, to catalyze direct aerobic oxidation benzoic acids without ligands,...
Alloys of Ag and small amounts Pd are promising as bifunctional catalysts, potentially combining the inherent selectivity noble with that more reactive Pd. Stable PdAg surface alloys prepared via evaporation onto Ag(111) at room temperature followed by annealing 400 K to create a model system. Using this procedure, most stable form alloy under vacuum was determined be Ag-capped alloy, on basis combination X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), density...
Sub-nanometric Cu clusters formed by endogenous reduction of salts and nanoparticles are active selective catalysts for C–N, C–C, C–O, C–S, C–P bond-forming reactions. have also been generated within a polymeric film stored with full stability months. In this way, they ready to be used on demand maintain high activity (TONs up 104) selectivity the above A potential mechanism formation sub-nanometric their electronic nature is presented.
HCl in solution accepts electron density from Au NPs and partially reduces at room temperature, as occurs with other simple diatomic molecules, such O2 H2 . The activation can be run catalytically the presence of alkynes to give exclusively E-vinyl chlorides, after regio- stereoselective transfer HCl. Based also on this method, vinyl chloride monomer (VCM) produced a milder greener way than current industrial processes.
Abstract Noble metals supported on reducible oxides, like CoO x and TiO , exhibit superior activity in many chemical reactions, but the origin of increased is not well understood. To answer this question we studied thin films an Au(111) single crystal surface as a model for CO oxidation reaction. We show that three reaction regimes exist response to topographic restructuring catalyst function reactant gas phase CO/O 2 stoichiometry temperature. Under oxygen-lean conditions moderate...
The reactive nature of carbenes can be modulated, and ultimately reversed, by receiving additional electron density from a metal. Here, it is shown that Au nanoparticles (NPs) generate an electron-rich carbene on surface after transferring to the carbonyl group in situ activated diazoacetate, as assessed Fourier transformed infrared (FT–IR) spectroscopy, magic angle spinning nuclear magnetic resonance (MAS NMR), Raman spectroscopy. Density functional theory (DFT) calculations support...
The combination of well-defined Fe3+ isolated single-metal atoms and Ag2 subnanometer metal clusters within the channels a metal-organic framework (MOF) is reported characterized by single-crystal X-ray diffraction for first time. resulting hybrid material, with formula [Ag02(Ag0)1.34FeIII0.66]@NaI2{NiII4[CuII2(Me3mpba)2]3}·63H2O (Fe3+Ag02@MOF), capable catalyzing unprecedented direct conversion styrene to phenylacetylene in one pot. In particular, Fe3+Ag02@MOF─which can easily be obtained...
Clusters get the gold: Atomic gold clusters Aun (n=3–6) are very active species (sub-mol %) for gold-catalyzed carbon–carbon and carbon–heteroatom bond-forming reactions of interest in organic synthesis. The can be formed situ or generated ex introduced into reaction media. Salts, complexes, nanoparticles (NPs) used as a starting source gold. Ts=para-toluenesulfonyl.
Propiolates cyclotrimerize in the presence of catalytic amounts gold nanoparticles to give aryl benzoates high yields and with turnover frequencies thousands per hour. Types alkynes other than propiolates do not react, and, if molecular oxygen is present dissociated by nanoparticles, electron-rich arenes engage propiolate form a new C–C bond. The activation bonds, beyond gold-catalyzed Michael additions, constitutes example how where modify electronic density unsaturated bonds opens door...
Abstract Heterogeneous catalysts are complex materials with multiple interfaces. A critical proposition in exploiting bifunctionality alloy is to achieve surface migration across interfaces separating functionally dissimilar regions. Herein, we demonstrate the enhancement of more than 10 4 rate molecular hydrogen reduction a silver oxide presence palladium compared pure resulting from transfer atomic islands onto surrounding formed oxidation palladium–silver alloy. The interface also...
Simple zeolites (NaY, NaX,…) catalyze the halogen switch between two different alkyl halides under either batch or flow reaction conditions. Sodalite cages are proposed to trigger transformation.
Abstract Cobalt is an efficient catalyst for Fischer−Tropsch synthesis (FTS) of hydrocarbons from syngas (CO + H 2 ) with enhanced selectivity long-chain when promoted by Manganese. However, the molecular scale origin enhancement remains unclear. Here we present experimental and theoretical study using model catalysts consisting crystalline CoMnO x nanoparticles thin films, where Co Mn are mixed at sub-nm scale. Employing TEM in-situ X-ray spectroscopies (XRD, APXPS, XAS), determine...
Gold complexes and salts decompose to catalytically active 3–5 atom gold clusters during the one-pot acylation–hydration of propargyl alcohols. Kinetic spectroscopic studies show that released ligands counteranions exert a direct effect on formation stability clusters.
Metal(oid) association facilitates hydrosilylation intermediates compared to the accepted highly-strained Chalk–Harrod mechanism and enables solid catalyst design.
The design of cascade reactions for synthetic programs is interest, particularly if the individual steps involve catalyzed reactions, and simple highly available molecules such as carbon dioxide (CO2), water (H2O) dihydrogen (H2) are employed. Here we show a three–step sequential reaction from epoxides to dehydrogenated diols, by combination commercially ionic liquids supported Pt species on charcoal (Pt/C), in low amounts (<0.05 mol%). process involves first carbonation with CO2,...
Abstract The supporting of pre‐formed soluble metal catalysts on solids is a typical methodology to transform but unrecoverable complexes into recoverable and reusable solid catalysts. However, this has been barely implemented for ligand‐less, bare single atoms (SMAs) nanoclusters (NCs) in organic synthesis, despite these ultrasmall species can be formed in‐situ during reaction the truly catalytic species. aim review explore how speciate active clusters homogeneous catalysis (in solution),...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInsect chemosterilants. 11. Substituted 3,5-diamino-1,2,4-dithiazolium salts and related compoundsJ. E. Oliver, S. C. Chang, R. T. Brown, J. B. Stokes, A. BorkovecCite this: Med. Chem. 1972, 15, 3, 315–320Publication Date (Print):March 1, 1972Publication History Published online1 May 2002Published inissue 1 March 1972https://pubs.acs.org/doi/10.1021/jm00273a025https://doi.org/10.1021/jm00273a025research-articleACS PublicationsRequest reuse...
Auf kleinstem Nenner: Palladiumcluster mit drei oder vier Atomen erwiesen sich als katalytisch aktive Spezies in ligandenfreien palladiumkatalysierten C-C-Kupplungen (siehe Bild). Die Cluster konnten Wasser stabilisiert und ohne Aktivitätseinbuße lange Zeit aufbewahrt werden. Hohe Produktausbeuten Umsatzfrequenzen (TOF) bis 105 h−1 wurden beobachtet. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed...