Articles tagged with Chemical Bonding
Researchers at Boston College have developed a new catalytic approach that enables concurrent control of multiple convergences and selectivities in intermolecular amination of allylic carbon-hydrogen bonds in alkenes. The cobalt-based system exploits unique features of homolytic radical reaction to form desired amine products in a high...
Researchers at Rice University have developed a photochemical process that simplifies the manufacture of essential precursors for drugs and agricultural chemicals. By illuminating reagents with visible light, they can form diazides in conditions far gentler than current industrial processes.
Researchers at the University of California, Riverside, have created a novel method to break down per- and polyfluoroalkyl substances (PFAS), also known as 'forever chemicals', in contaminated water. The hydrogen-infusion and UV light-based process achieves high molecular destruction rates without generating unwanted byproducts.
Researchers at UCSF's Cell Design Institute engineered cells with customized adhesion molecules to form complex multicellular ensembles in predictable ways. The discovery represents a major step toward building tissues and organs through regenerative medicine.
Researchers demonstrate the expanded use of a computational method called AFIR, predicting pericyclic reactions with accurate stereoselectivity based on target product molecule information. The technique successfully handles molecules up to 52 atoms and predicts stereochemistry for reactions that break Woodward-Hoffman rules.
Scientists developed a method to control the synthesis of single-atom catalysts, enabling the creation of bimetallic Fe-Co electrocatalysts with desired properties. These catalysts showed superior ammonia yield rates and faradaic efficiency under electrocatalytic nitrogen reduction reaction conditions.
Researchers have developed a novel approach to distinguish the sources of hydrocarbons by analyzing the relative abundance of carbon isotopes. The new method uses carbon-carbon clumping to identify biotic origins and has shown promising results in detecting hydrocarbons from microorganisms, thermogenic processes, and abiotic sources.
Researchers at the University of Colorado Boulder have developed a method to break down durable plastics into their most basic building blocks and reform them into the same material. This breakthrough could lead to the creation of new technologies, new materials, and enable the circular production of more plastic materials in daily life.
Researchers at University of Göttingen develop a new method to convert CO2 into chemical substances by confining molecules in nano-sized environments. The team demonstrates the ability to break individual chemical bonds and restore them in single molecules under controlled conditions.
Scientists have developed a method to control chemical reactions in a single molecule by applying voltage pulses, resulting in unprecedented selectivity. By fine-tuning the voltage, researchers can interconvert different products formed during the reaction.
A team of researchers from Tokyo University of Science has developed a novel multi-proton carrier complex that shows efficient proton conductivity even at high temperatures. The resulting starburst-type metal complex acts as a proton transmitter, making it 6 times more potent than individual imidazole molecules.
Researchers have successfully isolated and characterized rhodium(VII), the third-highest oxidation state of an element, using advanced ion trap technology. This discovery has significant implications for understanding exotic transition metal oxides and potential applications in materials science.
Researchers have developed a novel process converting methane into liquid methanol at ambient temperature and pressure using visible light. The method uses a continuous flow of methane/oxygen-saturated water over a novel metal-organic framework (MOF) catalyst, achieving 100% selectivity with no by-products.
Researchers at UC Riverside have found that common microbial communities can degrade a stubborn class of PFAS called fluorinated carboxylic acids (FCAs) by breaking the carbon-fluorine bond under anaerobic conditions. This breakthrough could lead to new methods for environmental remediation and reduce the harm caused by PFAS.
A new study reveals that two equal charges in enzymes do not repel each other, but instead attract, facilitating chemical reactions. The researchers used protein crystallography to obtain a structural snapshot of the substrate before the reaction and found an attractive interaction between the enzyme and substrate.
Researchers have provided direct insight into the electronic structure of a proton donating group in an amine aromatic photoacid using ultrafast X-ray spectroscopy. The study reveals major electronic structure changes occur on the base side of the Förster cycle, resolving the long-standing open question.
A unified approach to electrochemical energy storage involves recognizing a spectrum between chemical and physical retention of ions. This understanding can lead to the development of devices that combine high energy and high power, such as flexible batteries for wearable electronics.
Researchers developed a new technique called dual-detection impulsive vibrational spectroscopy (DIVS) to measure two distinct types of vibrational signals. DIVS enables synchronous measurement of THz- and fingerprint region vibrations, offering high temporal resolution for real-time chemical analysis.
Researchers have successfully created a transuranium complex with a multiple bond to just one element, enabling the isolation of such compounds for the first time. The discovery has significant implications for nuclear waste clean-up and opens up new opportunities for actinide science.
Researchers at Pusan National University discovered that tempered glass is more resistant to water-promoted fracture growth than annealed glass. The study found that water droplets penetrate microcracks in glass surfaces, dissolving silicon-oxygen bonds and degrading mechanical strength.
Researchers at Arizona State University have developed a new microscopy method that can track 100 single molecules simultaneously in three dimensions. The technique uses surface plasmon resonance (SPR) technology to precisely image molecular binding events and study their dynamic activities in real time.
Scientists from UCLA develop a do-it-yourself radiative cooler using household materials, achieving moderate to large temperature drops. The design's reproducibility and low cost make it an attractive standard for research settings.
Researchers have developed a new light-emitting material that doubles the intensity of existing LEDs while also being more energy-efficient. The material, cerium-doped zinc oxide, has the potential to be used in commercial LED lighting applications and could make lighting more affordable for households and businesses worldwide.
Researchers at Skoltech created a new electronegativity scale, improving Pauling's original scale with a formula that treats molecule stabilization as a multiplicative effect. The new scale works for both small and large differences in electronegativity, accurately predicting chemical bond energies and reactions.
A new machine learning approach offers important insights into catalysis by providing a tool to design efficient catalytic processes. The Bayeschem model explains how catalysts interact with different intermediates and determines the optimal bond strengths.
Scientists discovered that collagen produces harmful radicals when stretched, but these are quickly scavenged by nearby aromatic residues. The study suggests that collagen has evolved as a radical sponge to combat damage and may hold promise for improving tissue repair and transplantation in sports medicine.
Researchers employ neural networks to predict molecular bond energies, reducing computational cost and improving accuracy. The combination of AI and quantum chemistry calculations provides an efficient tool for quickly predicting molecular bond energies in complex systems.
Researchers at The University of Tokyo have developed a method to actively break chemical bonds using tiny antennae created by infrared lasers. This technique enables selective control over chemical reactions, increasing yields while minimizing unwanted side products.
Researchers at Tohoku University have successfully observed the microscopic chemical bonding state of ultrathin MgO using AR-HAXPES. This breakthrough could lead to improved MgO quality and accelerated development of STT-MRAM, a non-volatile memory with high-performance and low power consumption.
Researchers developed polymers that change color or fluorescence when subjected to mechanical load, addressing limitations of previous force-transducing molecules. The new concept allows for reversible detection of stress and is versatile, enabling applications in built-in monitors and stress mapping.
Researchers at UC Santa Cruz have developed nonmigratory plasticizers that attach to PVC polymer via a chemical bond, reducing leaching and potential health risks. The 'tadpole' plasticizer is particularly promising due to its ease of production and effectiveness.
A team of international researchers has successfully simulated chemical bonds using trapped ions on a quantum computer, marking a significant breakthrough in the development of full-scale quantum computers. This achievement demonstrates the potential of quantum chemistry to unlock new insights into material properties and behavior.
Researchers created a transparent hybrid film combining natural clay minerals and dyes that changes color in response to environmental humidity. The novel mechanism involves the confinement of dye molecules within nanometer-scale gaps, allowing for reversible color change without breaking chemical bonds.
Researchers at UMass Amherst have developed a molecular switch that uses light to control the release of compounds. The system consists of a thin membrane made up of chemical bonds, which can be compromised by the movement of a single chemical bond to allow the compounds to react with each other.
Future medications can be scaled up using electrochemistry, creating vicinal diamines without toxic waste. This process employs Earth-abundant manganese, offering a more sustainable alternative to traditional chemical synthesis methods.
UT Southwestern researchers have developed a method for direct conversion of double bond-containing hydrocarbons into multifunctional compounds with high purity. The new reaction utilizes a specially designed chiral catalyst to selectively create desirable molecules, accelerating pharmaceutical production.
Researchers have successfully created the first-ever iron-bismuth bond under extreme pressures equivalent to those within Mars' core. The new compound, FeBi2, shows promise in being superconductive and magnetic.
The study proposes an occupancy frequency approach to select representative configurations for reaction mechanism calculations, reducing the number of QM calculations required in hybrid simulations. This method focuses on average structure configurations, enabling a powerful tool for multiscale simulations.
Researchers have developed a simple and inexpensive way to extract high-purity silica compounds from agricultural waste using ethylene glycol and ethanol. This process could significantly reduce carbon emissions and costs associated with traditional methods.
Researchers at the University of Pittsburgh have discovered a new halogenation enzyme that can selectively replace inert C-H bonds with C-X bonds, enabling the creation of tailored molecules with improved pharmacological profiles. This breakthrough is expected to revolutionize the fields of pharmaceutical and agricultural industries.
Chemists at the University of Utah discovered a method to predict chemical reactions using bond vibrations, which can lead to more efficient catalysts for medicines, industrial products, and new materials. The researchers used infrared spectroscopy to analyze bond vibrations and built a mathematical model to predict reaction outcomes.
Scientists from Helmholtz-Zentrum Berlin used RIXS spectroscopy and ab initio theory to study the iron carbonyl complex. They discovered a strong orbital mixing between metal and ligands, weakening the chemical bond during excitation. This fundamental insight can help control catalytic properties and produce novel materials.
A new process called chemical lift-off lithography (CLL) enables precise patterning of biomolecules at the nanoscale, avoiding diffused patterns. The technique uses chemically treated stamps to remove molecules already in place on gold substrates.
Researchers developed a comprehensive model to describe molecular bonding, enabling predictions of binding free energy and resolving past inconsistencies. The new model provides a clear means for measuring this key parameter, critical for understanding material interactions.
Scientists have developed a novel technique to image the distribution of carbon and oxygen in samples with complex chemistry. The new method allows for the detection of tiny inclusions of water or diamond inside martian rock samples, providing insights into the molecular level structure of various materials.
Scientists observed a chemical bond breaking into two separate atoms in record-breaking detail, revealing the rearrangement of electrons. The research uses ultra-fast X-ray pulses to capture the process, with precision below 500 zeptoseconds.
Researchers at the University of Liverpool construct molecular 'knots' with dimensions of around two nanometers, using a process called self-assembly to mechanically bond interpenetrating loops. The discovery has potential applications in building molecular machines to trap harmful gases and pollutants.
Researchers found that molecular bonds don't always break faster when pulled, contradicting the intuitive notion of rubber bands. The sulfur-sulfur bond's fragmentation rate depends on nearby atom movement and protein structure changes.
Researchers analyze chlorotrinitromethane molecule to reveal extremely short carbon-clorine single bond of 1.69 Angstroms, breaking previous measurements. Theoretical calculations confirm electrostatic interactions between atoms contribute to this unusual bond length.
Researchers describe a unified description of electron movements through certain proteins, uncovering key pathways that optimize energy harvesting in photosynthesis and animal cells. The study reveals complex routing options that allow electrons to take shortcuts, increasing the challenge for theoreticians.
Researchers at MIT have identified a class of chemical molecules that preserve the metallic properties of carbon nanotubes, enabling them to be assembled and manipulated without losing conductivity. This breakthrough has potential applications in detectors, sensors, and optoelectronics.
A Dutch-German research team has successfully controlled a chemical reaction by steering the motion of electrons with ultrashort laser pulses. The team used phase-controlled laser pulses to manipulate the timing of electron motion, leading to a preferential emission of deuterium ions and atoms in specific directions.
Researchers used atomic force microscopes to 'yank' chemical bonds, accelerating reaction speeds while maintaining the order of bond formation and breaking. This discovery may aid in developing self-healing polymers and lead to a better understanding of fundamental energy exchange in chemical reactions.
Researchers at UC Davis have successfully synthesized a chromium-based compound with a five-fold bond, a feat previously thought impossible. This breakthrough challenges the current understanding of metal chemistry and opens up new avenues for research in carbon chemistry.
Scientists at Penn State have observed extended chains of phenylene molecules that align and interact without forming chemical bonds, paving the way for controlling growth and assembly of molecules. This discovery could lead to manipulating nanostructured materials with unprecedented precision.
Researchers have found a new bonding arrangement for carbon molecules, which could shed light on how carbon bonds with atoms to form molecules. The discovery challenges traditional understanding of carbon's basic structure and opens up new ideas about life's most basic element.
Scientists at the University of Chicago have discovered exactly how beta-lactamase deactivates penicillin, a crucial step in understanding the mechanism of resistance. This breakthrough could lead to improved antibiotic design and help combat hospital-acquired infections caused by resistant bacteria.
A team of Virginia Tech researchers has developed new oligoetherimides with improved secondary bonding adhesive applications. The new materials exhibit high adhesive strengths and retain most of their strength at different aging conditions.