Institut Català d'Investigació Química (ICIQ): Envíos recientes
Mostrando ítems 281-300 de 1286
Ion mobility mass spectrometry uncovers regioselectivity in the carboxylate-assisted C–H activation of palladium N-heterocyclic carbene complexes
Carboxylate-assisted Pd-catalyzed C–H bond activation constitutes a mild and versatile synthetic tool to efficiently and selectively cleave inert C–H bonds. Herein, we demonstrate a simple method to experimentally evaluate ...
Kinetically-Controlled Ni-Catalyzed Direct Carboxylation of Unactivated Secondary Alkyl Bromides without Chain Walking
Herein, we report the direct carboxylation of unactivated secondary alkyl bromides enabled by the merger of photoredox and nickel catalysis, a previously inaccessible endeavor in the carboxylation arena. Site-selectivity ...
Catalytic Domino Three-Component Synthesis of Functionalized Heterocycles from Carbon Dioxide
A catalytic domino, three-component reaction has been developed for the transformation of carbon dioxide into functionalized six-membered cyclic carbonates. The catalytic process combines an initial carboxylative cyclization ...
Air-Stable Gold Nanoparticles Ligated by Secondary Phosphine Oxides for the Chemoselective Hydrogenation of Aldehydes: Crucial Role of the Ligand
The synthesis of air-stable and homogeneous gold nanoparticles (AuNPs) employing tert-butyl(naphthalen-1-yl)phosphine oxide as supporting ligand is described via NaBH4 reduction of a Au(I) precursor, [(tert-butyl(naphtha ...
Enantioselective hydrogenation of ketones by iridium nanoparticles ligated with chiral secondary phosphine oxides
Chiral iridium nanoparticles (IrNPs) were synthesized by H2 reduction of (1,5-cyclooctadiene)(methoxy)iridium(I) dimer ([Ir(OMe)(COD)]2) in the presence of an asymmetric secondary phosphine oxide (4,5-dihydro-3H-dinaphth ...
Self-assembled molecules as selective contacts for efficient and stable perovskite solar cells
The charge-selective contacts play a crucial role in the charge dynamics of solar cells. In the fast race to achieve higher power conversion efficiencies in perovskite-based devices, the avoidance of the detrimental effects ...
Lattice-Stabilized Chromium Atoms on Ceria for N2O Synthesis
The development of selective catalysts for direct conversion of ammonia into nitrous oxide, N2O, will circumvent the conventional five-step manufacturing process and enable its wider utilization in oxidation catalysis. ...
Air-Stable Gold Nanoparticles Ligated by Secondary Phosphine Oxides as Catalyst for the Chemoselective Hydrogenation of Substituted Aldehydes: a Remarkable Ligand Effect
Air-stable and homogeneous gold nanoparticles (AuNPs, 1a–5a) ligated by various secondary phosphine oxides (SPOs), [R1R2P(O)H] (R1 = Naph, R2 = tBu, L1; R1 = R2 = Ph, L2; R1 = Ph, R2 = Naph, L3; R1 = R2 = Et, L4; R1 = R2 ...
Recent Advances in Ni-Catalyzed 1,1-Difunctionalization of Unactivated Olefins
Unactivated olefins rank amongst the most important feedstocks in organic synthesis. Their availability makes them particularly useful synthons for subsequent functionalization, particularly in a catalytic manner. Driven ...
One-Step Solution Deposition of Tin-Perovskite onto a Self-Assembled Monolayer with a DMSO-Free Solvent System
We show for the first time DMSO-free tin-based perovskite solar cells with a self-assembled hole selective contact (MeO-2PACz). Our method provides reproducible and hysteresis-free devices with MeO-2PACz, having the best ...
Bioinspired photocatalytic systems towards compartmentalized artificial photosynthesis
Artificial photosynthesis aims to produce fuels and chemicals from simple building blocks (i.e. water and carbon dioxide) using sunlight as energy source. Achieving effective photocatalytic systems necessitates a comprehensive ...
Phosphinothiolates as Ligands for Polyhydrido Copper Nanoclusters
The reaction of [CuI(HSC6H4PPh2)]2 with NaBH4 in CH2Cl2/EtOH led to air- and moisture-stable copper hydride nanoparticles (CuNPs) containing phosphinothiolates as new ligands, one of which was isolated by crystallization. ...
Challenges in the design and synthesis of self-assembling molecules as selective contacts in perovskite solar cells
Self-assembling molecules (SAMs), as selective contacts, play an important role in perovskite solar cells (PSCs), determining the performance and stability of these photovoltaic devices. These materials offer many advantages ...
Reversible vis-NIR electrochromic/electrofluorochromic switching in dual-functional devices modulated by different benzothiadiazole-arylamine anodic components
Redox active materials, whose optical emission and absorption spectra are both electrically switchable, are said to be dual functional electrochromic and electrofluorochromic materials. They are intriguing for a wide range ...
Triisopropylsilylethynyl-Functionalized Anthracene-Based Hole Transport Materials for Efficient Hybrid Lead Halide Perovskite Solar Cells
The development of hole transport materials (HTMs) is a prolific area of research due to the application of these materials in various technologies such as organic light-emitting diodes (OLEDs) or perovskite solar cells ...
On Surface Synthesis of an Eleven-Ring Sulphur-Doped Nonacene
Ditihienoacenes with a heptacene core, the heptaceno[2,3-b:11,12-b′]bis[1]benzothiophene, have been synthesized through the combination of solution and surface assisted chemistry. The atomic composition, structural arrangement ...
High-Throughput Experimentation as an Accessible Technology for Academic Organic Chemists in Europe and Beyond
For years now, High-Throughput Experimentation (HTE) have been applied to organic chemistry for reaction optimization and reaction discovery as a powerful tool for time and cost reduction. If this technology has been first ...
Influence of the carbazole moiety in self-assembling molecules as selective contacts in perovskite solar cells: interfacial charge transfer kinetics and solar-to-energy efficiency effects
The use of self-assembled molecules (SAMs) as hole transport materials (HTMs) in p–i–n perovskite solar cells (iPSCs) has triggered widespread research due to their relatively easy synthetic methods, suitable energy level ...
Solvation rules: aromatic interactions outcompete cation-π interactions in synthetic host-guest complexes in water
Chemical double mutant cycles were used to measure the interaction of a N-methyl pyridinium cation with a π-box in a calix[4]pyrrole receptor. Although the cation–π interaction is attractive (−11 kJ mol−1), it is 7 kJ mol−1 ...
Supercritical CO2 as an Efficient Medium for Macromolecular Carbonate Synthesis through Ring-Opening Co- and Teroligomerization
Ring-opening polymerization and teroligomerization processes that involve two different epoxides and carbon dioxide are significantly more efficiently executed in a supercritical CO2 medium. Here, we demonstrate that this ...
