Institut Català d'Investigació Química (ICIQ): Enviaments recents
Ara mostrant els elements 241-260 de 1286
Site-Selective Distal C(sp3)–H Bromination of Aliphatic Amines as a Gateway for Forging Nitrogen-Containing sp3 Architectures
Herein, we disclose a new strategy that rapidly and reliably incorporates bromine atoms at distal, secondary C(sp3)–H sites in aliphatic amines with excellent and predictable site-selectivity pattern. The resulting halogenated ...
Photo-Cross-Linked Fullerene-Based Hole Transport Material for Moisture-Resistant Regular Fullerene Sandwich Perovskite Solar Cells
Despite the high efficiencies currently achieved with perovskite solar cells (PSCs), the need to develop stable devices, particularly in humid conditions, still remains. This study presents the synthesis of a novel ...
Alkoxy Diazomethylation of Alkenes by Photoredox-Catalyzed Oxidative Radical-Polar Crossover
Herein, we present the discovery and development of the first photoredox-catalyzed alkoxy diazomethylation of alkenes with hypervalent iodine reagents and alcohols. This multicomponent process represents a new disconnection ...
Double polymer networks comprising covalent and hydrogen-bonded cross-links
We report the investigation of rubbery double networks that are based on poly(n-butyl acrylate) (BA) backbones and feature either non-covalent or covalent cross-links. The polymers for the supramolecular network were ...
Experimental evidences of the direct influence of external magnetic fields on the mechanism of the electrocatalytic oxygen evolution reaction
The use of magnetic fields as external stimuli to improve the kinetics of electrochemical reactions is attracting substantial attention, given their potential to reduce energy losses. Despite recent reports showing a ...
An Electrocatalytic Cascade Reaction for the Synthesis of Ketones Using CO2 as a CO Surrogate
The construction of carbonyl compounds via carbonylation reactions using safe CO sources remains a long-standing challenge to synthetic chemists. Herein, we propose a catalyst cascade Scheme in which CO2 is used as a CO ...
Enabling white color tunability in complex 3D-printed composites by using lead-free self-trapped exciton 2D perovskite/carbon quantum dot inks
The generation of stable white light emission using lead-free perovskites remains a huge challenge in the development of future display and lighting technologies, due to fast material deterioration and the decrease of the ...
Vinyl and Alkynyl Substituted Heterocycles as Privileged Scaffolds in Transition Metal Promoted Stereoselective Synthesis
Biologically active compounds and pharmaceutically relevant intermediates often feature sterically congested stereogenic centers, in particular, carbon stereocenters that are either tertiary tetrasubstituted ones or ...
Investing in entropy: the strategy of cucurbit[n]urils to accelerate the intramolecular Diels–Alder cycloaddition reaction of tertiary furfuryl amines
Cucurbit[n]urils, renowned for their host–guest chemistry, are becoming versatile biomimetic receptors. Herein, we report that cucurbit[7]uril (CB[7]) accelerates the intramolecular Diels–Alder (IMDA) reaction for previously ...
Battery-Less NFC Conductivity Sensor for Bovine Mastitis Detection in Farming 4.0
This work proposes a battery-less Near-Field Communication (NFC) milk conductivity sensor for the early-stage detection of bovine mastitis. A proof-of-concept prototype is designed, which is composed of a loop antenna, an ...
Droplet-Based Microfluidics Reveals Insights into Cross-Coupling Mechanisms over Single-Atom Heterogeneous Catalysts
Single-atom heterogeneous catalysts (SACs) hold promise as sustainable alternatives to metal complexes in organic transformations. However, their working structure and dynamics remain poorly understood, hindering advances ...
Local CO2 reservoir layer promotes rapid and selective electrochemical CO2 reduction
Electrochemical CO2 reduction reaction in aqueous electrolytes is a promising route to produce added-value chemicals and decrease carbon emissions. However, even in Gas-Diffusion Electrode devices, low aqueous CO2 solubility ...
Low-nuclearity CuZn ensembles on ZnZrOx catalyze methanol synthesis from CO2
Metal promotion could unlock high performance in zinc-zirconium catalysts, ZnZrOx, for CO2 hydrogenation to methanol. Still, with most efforts devoted to costly palladium, the optimal metal choice and necessary atomic-level ...
Strategies to improve hydrogen activation on gold catalysts
Catalytic reactions involving molecular hydrogen are at the heart of many transformations in the chemical industry. Classically, hydrogenations are carried out on Pd, Pt, Ru or Ni catalysts. However, the use of supported ...
Stability and lifetime of diffusion-trapped oxygen in oxide-derived copper CO2 reduction electrocatalysts
Oxide-derived Cu has an excellent ability to promote C–C coupling in the electrochemical carbon dioxide reduction reaction. However, these materials largely rearrange under reaction conditions; therefore, the nature of the ...
Solar hydrogen production from electrochemical ammonia splitting powered by a single perovskite solar cell
For carbon-free electrochemical fuel formation, the electrochemical cell must be powered by renewable energy. Obtaining solar-powered H2 fuel from water typically requires multiple photovoltaic cells and/or junctions to ...
Tetra-azobenzene extended calix[4]pyrroles: influence of photo-isomerization on chloride binding and its transport through liposomal membranes
In this work, we report the synthesis of three tetra-azobenzene extended calix[4]pyrroles and describe their photo-isomerization behavior in dichloromethane monitored by UV-Vis and NMR spectroscopies. We study and compare ...
CPE-Na-Based Hole Transport Layers for Improving the Stability in Nonfullerene Organic Solar Cells: A Comprehensive Study
Organic photovoltaic (OPV) cells have experienced significant development in the last decades after the introduction of nonfullerene acceptor molecules with top power conversion efficiencies reported over 19% and considerable ...
Systematic screening of transition-metal-doped hydroxyapatite for efficient photocatalytic CO2 reduction
We present the first comprehensive investigation of transition metal-substituted Hydroxyapatite (TM-HAP) materials for photocatalytic CO2 reduction (CO2RR). Density functional theory (DFT) was used to study in a systematic ...
Molecular Engineering of Electrocatalytic Nanomaterials for Hydrogen Evolution: The Impact of Structural and Electronic Modifications of Anchoring Linkers on Electrocatalysis
The anticipated shortage of an increasing number of critical elements, especially metals, requires a shift toward molecularly defined materials with low metal loadings. More particularly, surface-anchored molecular catalysts ...
