Abstract The demand for nanocomposites of graphene and carbonaceous materials decorated with metallic nanoparticles is increasing on account their applications in science technology. Traditionally, the production graphene-metal assemblies achieved by non-environmentally friendly reduction salts suspensions. However, precursor residues during nanoparticle growth may reduce surface activity promote cross-chemical undesired effects. In this work we present a laser-based alternative to...

The catalytic dehydrogenative coupling of silanes and alcohols represents a convenient process to produce hydrogen on demand. catalyst, an iridium complex the formula [IrCp*(Cl)2(NHC)] containing N-heterocyclic carbene (NHC) ligand functionalized with pyrene tag, catalyzes efficiently reaction at room temperature producing H2 quantitatively within few minutes. As result, 1,4-disilabutane methanol enables effective storage capacity 4.3 wt % that is as high contained in dehydrogenation formic...

Green efficient synthesis of carboxylic acids catalyzed by molecular ruthenium complexes supported on graphene using water as solvent and with the formation hydrogen a by-product.

Abstract The compound [Ru( p ‐cym)(Cl) 2 (NHC)] is an effective catalyst for the room‐temperature coupling of silanes and alcohols with concomitant formation molecular hydrogen. High activity observed a variety substrates affording quantitative yields in minutes at room temperature loading as low 0.1 mol %. reaction thermodynamically and, presence Ru complex, kinetically favourable allows rapid hydrogen generation on‐demand temperature, under air, without any additive. pair silane/alcohol...

Abstract The potential application of the primary amine/nitrile pair as a liquid organic hydrogen carrier (LOHC) has been evaluated. Ruthenium complexes formula [( p ‐cym)Ru(NHC)Cl 2 ] (NHC=N‐heterocyclic carbene) catalyze acceptorless dehydrogenation amines to nitriles with formation molecular hydrogen. Notably, reaction proceeds without any external additive, under air, and mild conditions. catalytic properties ruthenium complex supported on surface graphene have explored for reutilization...

The catalytic properties of graphene-derived materials are evaluated in acceptorless dehydrogenation N-heterocycles. Among them, reduced graphene oxides (rGOs) active (quantitative yields 23 h) under mild conditions (130 °C) and act as efficient heterogeneous carbocatalysts. rGO exhibits reusability stability at least during eight consecutive runs. Mechanistic investigations supported by experimental evidence (i.e., organic molecules model compounds, purposely addition metal impurities...

Palladium nanoparticles (NPs) have been obtained by decomposition of well-defined palladium complexes noncovalently anchored onto the surface reduced graphene oxide. Morphological analysis microscopy showed presence small NPs homogeneously distributed on support. Characterization X-ray photoelectron spectroscopy confirmed that contain Pd(2+) and Pd(0) oxidation states N-heterocyclic carbene bromo ligands. The catalytic properties with without support evaluated in hydrogenation alkynes....

A simple, safe and robust system for the continuous, in situ on demand hydrogen generation under mild conditions. The highly pure generated can be used further hydrogenation reactions both batch continuous flow

The reduction of aryl azides in the presence water and air without an obvious reducing agent is reported.

The use of different metals acting together in a synergistic way allows synthetic transformations that are not achievable by other means. Metal cooperation becomes important catalytic processes for the synthesis compounds with sophisticated structures or difficult transformations. Rational design multiple‐metal‐catalysed requires metal complexes and reaction conditions compatible, which general is straightforward. A key feature success found all systems involving multimetallic catalyst...

Gold(III) complexes containing trifluoromethyl ligands are efficient catalysts in the hydration of alkynes, operating at low catalyst loadings, without additives, using environmentally friendly solvents and mild conditions (60 °C). Hydration terminal internal alkynes provides corresponding ketones quantitative yields special precautions as dry or inert atmospheres. Remarkably, asymmetric proceeds with moderate to notable regioselectivities, providing mixtures two possible isomers ratios up 90 : 10.

Abstract A copper complex bearing an N ‐heterocyclic carbene ligand with a pyrene “tail” attached to the backbone has been prepared and supported on reduced graphene oxide (rGO). The free materials have employed as homogeneous heterogeneous catalysts in functionalization of hydrocarbons such n ‐hexane, cyclohexane, benzene through incorporation CHCO 2 Et unit from ethyl diazoacetate. graphene‐anchored displays higher reaction rates induces yields than its soluble counterpart, features that...

Herein, a novel silver and chromium nanostructured N-doped carbonaceous material has been synthesized by biomass-annealing approach using readily available chitosan as raw material. The resulting catalyst AgCr@CN-800 applied for the dehydrogenative coupling reaction of various silanes with different alcohols to obtain corresponding silyl ethers under aerobic mild conditions. Besides excellent activity selectivity, as-prepared exhibits good stability reusability. Characterization X-ray...

Gold nanoparticles stabilized by NHC ligands and supported onto reduced graphene oxide (rGO) catalyse the functionalization of cyclohexane benzene C-H bonds upon insertion carbene CHCO2Et (from N2CHCO2Et) groups. This is first example in which such Csp3-H or Csp2-H are functionalized with this strategy nanoparticulated gold. Au-NP@rGO material shows an exceptional activity, providing TON values 5-10 times higher than those already reported for molecular gold catalysts. Recyclability also...

This work describes a complete laboratory experiment that involves the synthesis of ruthenium complex [Ru(p-cym)(NHC)Cl2] (NHC = N-heterocyclic carbene) and its use as catalyst for coupling hydrosilanes alcohols. The hydrogen gas produced in reaction is measured using an inverted buret to trap which allows student monitor evolution reaction. experience constitutes opportunity focus on experimental skills fundamental concepts organometallic chemistry catalysis.

Nanocomposites formed by graphene and metal nanoparticles (MNPs) are considered to become one of the most important technological advances due their wide application range, as it is possible exploit combination electronic characteristics in optical metallic nanostructures [1]. Conventionally, in-situ synthesis these kind nanocomposites achieved means reduction salts presence derivatives or separated fabrication MNPs subsequent decoration [2]. The traditional approach neither avoid creation...