A5008113569- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Molecular Junctions and Nanostructures
- Surface Chemistry and Catalysis
- Electrocatalysts for Energy Conversion
- Chemical Synthesis and Reactions
- Quantum and electron transport phenomena
- Catalytic C–H Functionalization Methods
- Oxidative Organic Chemistry Reactions
- Photochromic and Fluorescence Chemistry
- Supramolecular Self-Assembly in Materials
- Fullerene Chemistry and Applications
- Photoreceptor and optogenetics research
- Catalytic Cross-Coupling Reactions
- Electrochemical Analysis and Applications
- Magnetism in coordination complexes
- Graphene research and applications
- Theoretical and Computational Physics
- Nanocluster Synthesis and Applications
- CO2 Reduction Techniques and Catalysts
- Organic and Molecular Conductors Research
- 2D Materials and Applications
- Inorganic Chemistry and Materials
- Nanomaterials for catalytic reactions
- Crystallography and molecular interactions
Columbia University
2018-2022
Direct conversion of solar energy to mechanical work promises higher efficiency than multistep processes, adding a key tool the arsenal solutions necessary for our global future. The ideal photomechanical material would convert sunlight into motion rapidly, without attrition, and proportionally stimulus. We describe crystals tetrahedral isocyanoazobenzene–copper complex that roll continuously when irradiated with broad spectrum white light, including sunlight. rolling results from bending...
Aryl halides are ubiquitous functional groups in organic chemistry, yet despite their obvious appeal as surface-binding linkers and precursors for controlled graphene nanoribbon synthesis, they have seldom been used such molecular electronics. The confusion regarding the bonding of aryl iodides to Au electrodes is a case point, with ambiguous reports both dative Au–I covalent Au–C contacts. Here we form single-molecule junctions series oligophenylene wires terminated asymmetrically iodine...
Coherent tunneling electron transport through molecular wires has been theoretically established as a temperature-independent process. Although several experimental studies have shown counter examples, robust models to describe this temperature dependence not thoroughly developed. Here, we demonstrate that dynamic structures lead temperature-dependent conductance within coherent regime. Using custom-built variable-temperature scanning microscopy break-junction instrument, find...
Abstract A single‐molecule method has been developed based on the scanning tunneling microscope (STM) to selectively couple a series of aniline derivatives and create azobenzenes. The Au‐catalyzed oxidative coupling is driven by local electrochemical potential at nanostructured Au STM tip. products are detected in situ measuring conductance molecular junction elongation compared with analogous measurements expected azobenzene prepared ex situ. This approach robust, it can quickly...
The electric fields created at solid–liquid interfaces are important in heterogeneous catalysis.
An organocatalytic oxidation platform that capitalizes on the capacity of hydrazines to undergo rapid autoxidation diazenes is described. Commercially available benzo[c]cinnoline shown catalyze alkyl halides aldehydes in a novel mechanistic paradigm involving nucleophilic attack, prototropic shift, and hydrolysis. The hydrolysis reoxidation events occur readily with only adventitious oxygen water. A survey scope viable substrates along computational studies give insight into this mode catalysis.
The area of two-dimensional (2D) materials research would benefit greatly from the development synthetically tunable van der Waals (vdW) materials. While bottom-up synthesis 2D frameworks nanoscale building blocks holds great promise in this quest, there are many remaining hurdles, including design that reliably produce lattices and growth macroscopic crystals can be exfoliated to Here we report regioselective cluster [trans-Co6Se8(CN)4(CO)2]3-/4-, a "superatomic" block designed polymerize...
Recent interest in potassium-doped p-terphenyl has been fueled by reports of superconductivity at Tc values surprisingly high for organic compounds. Despite these interesting properties, studies the structure-function relationships within materials have scarce. Here, we isolate a phase-pure crystal p-terphenyl: [K(222)]2[p-terphenyl3]. Emerging antiferromagnetism anisotropic structure is studied depth magnetometry and electron spin resonance. Combining experimental results with density...
Abstract An organocatalytic oxidation platform that capitalizes on the capacity of hydrazines to undergo rapid autoxidation diazenes is described. Commercially available benzo[ c ]cinnoline shown catalyze alkyl halides aldehydes in a novel mechanistic paradigm involving nucleophilic attack, prototropic shift, and hydrolysis. The hydrolysis reoxidation events occur readily with only adventitious oxygen water. A survey scope viable substrates along computational studies give insight into this...
Abstract A single‐molecule method has been developed based on the scanning tunneling microscope (STM) to selectively couple a series of aniline derivatives and create azobenzenes. The Au‐catalyzed oxidative coupling is driven by local electrochemical potential at nanostructured Au STM tip. products are detected in situ measuring conductance molecular junction elongation compared with analogous measurements expected azobenzene prepared ex situ. This approach robust, it can quickly...
The electric fields created at solid-liquid interfaces are important in heterogeneous catalysis. Here we describe the Ullmann coupling of aryl iodides on rough gold surfaces, which monitor situ using scanning tunneling microscope-based break junction (STM-BJ) and ex mass spectrometry fluorescence spectroscopy. We find that this Ullman reaction occurs only surfaces polar solvents, latter implicates interfacial fields. These experimental observations supported by density functional theory...