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Browsing by Subject "Gold"

Now showing items 1-20 of 32

Activity of ceria and ceria-supported gold nanoparticles for the carbamoylation of aliphatic amines by dimethyl carbonate

Juárez Marín, Raquel; Corma Canós, Avelino; García Gómez, Hermenegildo (International Union of Pure and Applied Chemistry, 2011-09-19)

Aliphatic amines react sluggishly with dimethyl carbonate (DMC) to give a mixture of N-methylation and carbamoylation. Nanoparticulated ceria as catalyst increases, in general, conversion and selectivity toward carbamoylation. ...
Air-Stable, Dinuclear and Tetranuclear sigma,pi-Acetylide Gold(I) Complexes and Their Catalytic Implications

Grirrane, Abdessamad; García Gómez, Hermenegildo; Corma Canós, Avelino; Alvarez González, Eleuterio (John Wiley & Sons, 2013)

[EN] Two for one gold: Factors governing the formation of isolable digold(I) ó,ð-acetylide complexes are given (see scheme), indicating the general tendency of phosphine AuI precatalysts to form this type of complexes, ...
Alginate as template in the preparation of active titania photocatalysts

Buaki-Sogo, Mireia; Serra, Marco; Primo Arnau, Ana María; Alvaro Rodríguez, Maria Mercedes; García Gómez, Hermenegildo (WILEY-VCH Verlag GmbH & Co. KGaA,, 2012)

[EN] A simple and reliable procedure to prepare TiO2 and Au/TiO2 samples with high photocatalytic activity for hydrogen generation from water/methanol mixtures is reported, which uses natural alginate as the templating ...
Au@MOF-5 and Au/MOx@MOF-5 (M = Zn, Ti; x = 1, 2): Preparation and Microstructural Characterisation

Müller, Maike; Stuart, Turner; Lebedev, Oleg, I.; Wang, Yuemin; Van Tendeloo, Gustaaf; Fischer, Roland A. (Wiley-VCH Verlag, 2011)

[EN] The Zn-carboxylate-based porous coordination polymer MOF-5 [Zn4O(bdc)(3)] and the metal oxide loaded materials ZnO@MOF-5 and TiO2@MOF-5 were loaded in a second step with the precursor [ClAuCO] to yield intermediate ...
Bimetallic Oriented (Au/Cu2O) vs. Monometallic 1.1.1 Au (0) or 2.0.0 Cu2O Graphene-Supported Nanoplatelets as Very Efficient Catalysts for Michael and Henry Additions

Simion, Andrada; Candu, Natalia; Coman, Simona M.; Primo Arnau, Ana Maria; Esteve-Adell, Iván; Michelet, Veronique; Parvulescu, Vasile I.; García Gómez, Hermenegildo (John Wiley & Sons, 2018-12-02)

[EN] Michael and Henry addition reactions have been investigated using mono (Au and Cu2O) and bimetallic nanoplatelets (Au/Cu2O) grafted onto few-layers graphene (fl-G) films as heterogeneous catalysts by comparison with ...
Coupling two multistep catalytic cycles for the one-pot synthesis of propargylamines from alcohols and primary amines on nanoparticulated gold catalyst

Corma Canós, Avelino; Navas Escrig, Javier; Sabater Picot, Mª José (Wiley-VCH Verlag, 2012)

[EN] A one-pot reaction was performed with a nanoparticulated gold catalyst. A secondary amine is formed through N-monoalkylation of a primary amine with an alcohol by a borrowing hydrogen methodology in a three-step ...
Cyanido-Bridged FeII-MI Dimetallic Hofmann-Like Spin-Crossover Coordination Polymers Based on 2,6-Naphthyridine

Piñeiro-López, L.; Valverde-Muñoz, F. J.; Seredyuk, M.; Bartual-Murgui, C.; Muñoz Roca, María Del Carmen; Real, J. A. (John Wiley & Sons, 2018-01-31)

[EN] Two new 3D spin-crossover (SCO) Hofmann-type coordination polymers {Fe(2,6-naphthy)[Ag(CN)2][Ag2(CN)3]} (1; 2,6-naphthy = 2,6-naphthyridine) and {Fe(2,6-naphthy)- [Au(CN)2]2}·0.5PhNO2 (2) were synthesized and ...
Demonstration of near infrared gas sensing using gold nanodisks on functionalized silicon

Rodríguez Cantó, Pedro Javier; Martínez Marco, Mª Luz; Rodríguez Fortuño, Francisco José; Tomás Navarro, Begoña; Ortuño Molinero, Rubén; Peransi Llopis, Sergio Manuel; Martínez Abietar, Alejandro José (Optical Society of America, 2011)

[EN] In this work, we demonstrate experimentally the use of an array of gold nanodisks on functionalized silicon for chemosensing purposes. The metallic nanostructures are designed to display a very strong plasmonic resonance ...
Double A(3)-Coupling of Primary Amines Catalysed by Gold Complexes

Grirrane, Abdessamad; Alvarez-González, Eleuterio; García Gómez, Hermenegildo; Corma Canós, Avelino (John Wiley & Sons, 2018)

[EN] A novel family of dipropargylamines has been synthesized in one pot through a double catalytic A3-coupling of five component. Several reactions of LAu-amine complexes with organic reagents were studied and followed ...
El azar y la intuición como medio de producción pictórica

Saura Perez, Cristina (2020-07-29)

[ES] En el presente trabajo se exploran las posibilidades del azar y la intuición como forma de producción pictórica a través de la técnica del pouring, color field y dripping. En la parte teórica se aborda la abstracción ...
Enhancement of the catalytic activity of supported gold nanoparticles for the fenton reaction by light

Navalón Oltra, Sergio; De Miguel de la Torre, Maykel; Martín González, Roberto; Alvaro Rodríguez, Maria Mercedes; García Gómez, Hermenegildo (American Chemical Society, 2011)

[EN] Laser flash photolysis of supported gold nanopar-ticles exciting at the surface plasmon band (532 nm) has allowed in the case of Au/CeO 2 and Au/OH-npD (OH-npD: Fenton-treated diamond nanoparticles) detection of ...
Exceptional oxidation activity with size-controlled supported gold clusters of low atomicity

Corma Canós, Avelino; Concepción Heydorn, Patricia; Boronat Zaragoza, Mercedes; Sabater Picot, Mª José; Navas Escrig, Javier; Yacaman, Miguel José; Larios, Eduardo; Posadas, Álvaro; López Quintela, M. Arturo; Buceta, David; Mendoza, Ernest; Guilera, Gemma; Mayoral, Álvaro (Nature Publishing Group, 2013-09)

[EN] The catalytic activity of gold depends on particle size, with the reactivity increasing as the particle diameter decreases. However, investigations into behaviour in the subnanometre regime (where gold exists as small ...
Functionalized Gold Nanoparticles as an Approach to the Direct ColorimetricDetection of DCNP Nerve Agent Simulant

Martí, Almudena; Costero Nieto, Ana María; Gaviña, Pablo; Gil Grau, Salvador; Parra Álvarez, Margarita; Brotons-Gisbert, Mauro; Sanchez-Royo, Juan Francisco (Wiley-VCH Verlag, 2013-08)

[EN] New functionalized gold nanoparticles have been synthesized and their ability to act as colorimetric molecular probes for the naked-eye detection of nerve agent simulant DCNP has been studied. The detection process ...
Generation of defects on oxide supports by doping with metals and their role in oxygen activation

Boronat Zaragoza, Mercedes; Corma Canós, Avelino (Elsevier, 2011-07-01)

Doping of anatase TiO2 with Au and Fe has been investigated using DFT methods. The geometry distortion, charge and spin density distribution in the lattice and oxygen vacancy formation energies calculated for the Au- and ...
Gold Catalysis Opens Up a New Route for the Synthesis of Benzimidazoylquinoxaline Derivatives from Biomass Derived Products (Glycerol)

Climent Olmedo, María José; Corma Canós, Avelino; Iborra Chornet, Sara; Martínez Silvestre, Sergio (Wiley-VCH Verlag, 2013-12)

Process intensification by using well-defined solid catalysts able to perform one-pot multistep reactions is one of the open fronts in heterogeneous catalysis. This is even more relevant if new, more efficient synthesis ...
Gold(III) stabilized over ionic liquids grafted on MCM-41 for highly efficient three component coupling reactions

Bobadilla, Luis F; Blasco Lanzuela, Teresa; Odriozola, José Antonio (Royal Society of Chemistry, 2013)

[EN] Two alkoxysilyl-modified ionic liquids (ILs) have been synthesized and further grafted onto mesoporous silica, MCM-41; these ionic liquids were used for dispersing AuCl3 catalysts that activate C-H bonds as required ...
Heterogenized Gold Complexes: Recoverable Catalysts for Multicomponent Reactions of Aldehydes, Terminal Alkynes, and Amines

Villaverde, Gonzalo; Corma Canós, Avelino; Iglesias, Marta; Sánchez, Félix (American Chemical Society, 2012-02)

[EN] A series of gold complexes were tested as catalysts in the synthesis of propargylamines by the three component coupling reaction of amines, aldehydes, and alkynes. These complexes are efficient catalysts for the ...
Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses

Rodríguez Fortuño, Francisco José; Martínez Marco, Mª Luz; Tomás Navarro, Begoña; Ortuño Molinero, Rubén; Martí Sendra, Javier; Martínez Abietar, Alejandro José; Rodríguez Cantó, Pedro Javier (American Institute of Physics, 2011)

In this work, we report the design, fabrication, and characterization of gold nanocrosses for chemosensing purposes. The nanocrosses are designed to exhibit a localized surface plasmon resonance which is very sensitive to ...
Influence of the preparation procedure on the catalytic activity of gold supported on diamond nanoparticles for phenol peroxidation

Martín González, Roberto; Navalón Oltra, Sergio; Delgado, Juan José; Calvino, José J.; Alvaro Rodríguez, Maria Mercedes; García Gómez, Hermenegildo (Wiley-VCH Verlag, 2011-08-16)

The catalytic activity of diamond-supported gold nanoparticle (Au/D) samples prepared by the deposition/precipitation method have been correlated as a function of the pH and the reduction treatment. It was found that the ...
Intervención en la ornamentación dorada del espacio central y acceso sur de la Basílica de la Virgen de los Desamparados de Valencia

Alfonso Muñoz, Mireia; Ferragut Adam, Xavier; Guerola Blay, Vicente; Roig Picazo, M. Pilar (Instituto Universitario de Restauración del Patrimonio de la UPV, 2008)

El objetivo de este artículo es mostrar las posibles soluciones de intervención sobre diferentes problemáticas en las ornamentaciones doradas de grandes conjuntos monumentales. A partir de la intervención del espacio ...