A5068661260- Graphene research and applications
- Molecular Junctions and Nanostructures
- X-ray Diffraction in Crystallography
- Surface Chemistry and Catalysis
- Crystallization and Solubility Studies
- Cyclization and Aryne Chemistry
- Force Microscopy Techniques and Applications
- Magnetism in coordination complexes
- Quantum and electron transport phenomena
- Porphyrin and Phthalocyanine Chemistry
- Crystallography and molecular interactions
- Synthesis and Properties of Aromatic Compounds
- Electron Spin Resonance Studies
- Carbon Nanotubes in Composites
- Fullerene Chemistry and Applications
- Diamond and Carbon-based Materials Research
- Molecular spectroscopy and chirality
- Synthesis and pharmacology of benzodiazepine derivatives
- Synthesis and Reactions of Organic Compounds
- Fluorine in Organic Chemistry
- Chemical synthesis and alkaloids
- Quantum-Dot Cellular Automata
- Cyclopropane Reaction Mechanisms
- Advanced Memory and Neural Computing
- Organic Chemistry Cycloaddition Reactions
Universidade de Santiago de Compostela
2016-2024
Center for Research in Molecular Medicine and Chronic Diseases
2016-2024
University of Oxford
2022-2023
Max-Planck-Institut für Kohlenforschung
2020
In recent years, synthetic transformations based on aryne chemistry have become particularly popular, mostly due to the spread of methods generate these highly reactive intermediates in a controlled manner under mild reaction conditions. fact, cycloadditions such as Diels-Alder are nowadays widely used for efficient preparation polycyclic aromatic compounds. 1998, our group discovered that arynes can undergo transition metal-catalyzed reactions, finding opened new perspectives chemistry....
Graphene nanoribbons (GNRs), low-dimensional platforms for carbon-based electronics, show the promising perspective to also incorporate spin polarization in their conjugated electron system. However, magnetism GNRs is generally associated with localized states around zigzag edges, difficult fabricate and high reactivity. Here we demonstrate that can be induced away from physical GNR edges through atomically precise engineering topological defects its interior. A pair of substitutional boron...
Controlling selectivity of reactions is a quest in chemistry. Here, we demonstrate reversible and selective bond formation dissociation promoted by tip-induced reduction-oxidation on surface. Molecular rearrangements leading to different constitutional isomers are selected the polarity magnitude applied voltage pulses from tip combined scanning tunneling atomic force microscope. Characterization dependence determination reaction rates isomerization provide insight into underlying mechanisms....
Four decades after the first (and only) reported synthesis of kekulene, this emblematic cycloarene has been obtained again through an improved route involving construction a key synthetic intermediate, 5,6,8,9-tetrahydrobenzo[m]tetraphene, by means double Diels-Alder reaction between styrene and versatile benzodiyne synthon. Ultra-high-resolution AFM imaging single molecules kekulene computational calculations provide additional support for molecular structure with significant degree bond...
Spin-hosting graphene nanostructures are promising metal-free systems for elementary quantum spintronic devices. Conventionally, spins protected from quenching by electronic bandgaps, which also hinder access to their state. Here, we present a narrow nanoribbon substitutionally doped with boron heteroatoms that combines metallic character the presence of localized spin 1/2 states in its interior. The ribbon was fabricated on-surface synthesis on Au(111) substrate. Transport measurements...
Abstract The Cu‐catalyzed reaction of substituted α‐diazoesters with fluoride gives α‐fluoroesters ee values up to 95 %, provided that chiral indane‐derived bis(oxazoline) ligands are used carry bulky benzyl substituents at the bridge and moderately isopropyl groups on their core. apparently homogeneous solution CsF in C 6 F /hexafluoroisopropanol (HFIP) is best medium, but biphasic mixture CH 2 Cl /HFIP also provides good results. DFT studies suggest initially attacks Cu‐ rather than C‐atom...
Synthesis of a triporous nanographene with 102 sp<sup>2</sup> carbon atoms by combining solution and surface chemistry.
Vanadium(IV) magnetic centers are prime candidates for molecular quantum units. One long-standing question is how to obtain a scaffold that connects multiple and allows two communication modalities: electronic. We have synthesized studied selection of vanadyl porphyrin dimers as models the most synthetically accessible linear arrays. show strongly π-conjugated backbone places system in an intermediate regime dominated by exchange coupling (J) protects coherence against electron pair...
The synthesis of an efficient precursor the novel 1,7-naphthodiyne synthon is reported.
Using high-resolution atomic force microscopy (AFM) with CO-functionalized tips, we atomically resolved individual molecules from Murchison meteorite samples. We analyzed powdered material directly, as well processed extracts that prepared to facilitate characterization by AFM. From the untreated sample, very few molecules, sample contained mostly small could not be identified By contrast, using a procedure based on several trituration and extraction steps organic solvents, isolated fraction...
Abstract Unimolecular current rectifiers are fundamental building blocks in organic electronics. Rectifying behavior has been identified numerous systems due to electron‐hole asymmetries of orbital levels interfaced by a metal electrode. As consequence, the rectifying ratio (RR) determining diode efficiency remains fixed for chosen molecule‐metal interface. Here, mechanically tunable molecular exhibiting an exceptionally large rectification (>10 5 ) and reversible direction is presented....
During the last two decades aryne and bisaryne equivalents have been increasingly used as privileged building blocks for synthesis of polycyclic aromatic hydrocarbons (PAHs). Here we report reactivity an efficient precursor 2,6,10-triphenylenotriyne synthon, which constitutes best example to date a trisaryne equivalent on benzofused polyaromatic core.
Vanadium(IV) magnetic centers are prime candidates as molecular quantum information units. One of the longstanding problems is to obtain an extendable scaffold that transmits interaction a degree usable for processing, and allows upscaling multiple centers, while preserving sufficiently long coherence time. Here, we show fused porphyrins allow tailored scaffolding vanadyl units, with almost flat conjugated π-system offers substantial advantages communication between ions, leading...
Vanadium(IV) magnetic centers are prime candidates as molecular quantum units. One longstanding question is how to obtain a scaffold that connects multiple and allows two communication modalities: electronic. We have synthesized studied selection of vanadyl porphyrin dimers, models the most synthetically accessible linear arrays. show strongly π-conjugated backbone places system in strong coupling regime protects coherence against electron pair flip-flop processes at low temperatures (<10...
The reaction of 2-(trimethylsilyl)thiophen-3-yl triflate with CsF in the presence 2,3,4,5-tetraphenylcyclopentadienone affords 4,5,6,7-tetraphenylbenzo[b]thiophene, as it would be expected from hypothesized generation and trapping 2-thiophyne. However, a detailed experimental computational study discards intermediacy this elusive 5-membered hetaryne. Instead, complex mechanism involving an intermediate ketocarbene, which adds to cyclopentadienone give isolable tricyclic intermediate,...
Unimolecular current rectifiers are fundamental building blocks in organic electronics. Rectifying behavior has been identified numerous systems due to electron-hole asymmetries of orbital levels interfaced by a metal electrode. As consequence, the rectifying ratio (RR) determining diode efficiency remains fixed for chosen molecule-metal interface. Here, we present mechanically tunable molecular exhibiting an exceptionally large rectification (>10^5) and reversible direction. The system...
Spin-hosting graphene nanostructures are promising metal-free systems for elementary quantum spintronic devices. Conventionally, spins protected from quenching by electronic bandgaps, which also hinder access to their state. Here, we present a narrow nanoribbon substitutionally doped with boron heteroatoms that combines metallic character the presence of localized spin 1/2 states in its interior. The ribbon was fabricated on-surface synthesis on Au(111) substrate. Transport measurements...