Articles tagged with Chirality
Researchers from Nagoya Institute of Technology have successfully demonstrated the first enantioselective Pictet-Spengler reaction of acyclic α-ketoesters with tryptamines, achieving high yields and enantioselectivity. The study expands the scope of the process, which could accelerate drug development.
A team of researchers developed a novel method for producing optically active hydroxy β-lactam derivatives using baker's yeast and microwave irradiation. The process yielded 3:1 ratio of two hydroxyl compounds in 65% yield, with the resulting compounds showing high optical purity.
Researchers discovered how a single mutation in an enzyme enables bacteria to evade antibiotics by using mirrored structures. This finding has implications for developing more resilient inhibitors and proactive drug designs.
Researchers at NTU Singapore have developed a new method to generate sulphur pharmacophores, which are crucial for drug discovery. The method uses a catalyst called pentanidium and can produce multiple variations of pharmacophores, making the process more efficient and fruitful.
Researchers have developed conducting systems that control electron spin and transmit a spin current over long distances without ultra-cold temperatures. This breakthrough enables the creation of new technologies for encoding and transmitting information at room temperature.
Physicists at the University of Bath and Michigan discover a new photonic effect in semiconducting nanohelices, accelerating drug discovery and development. The effect enables chirality measurement in tiny volumes, potentially revolutionizing high-throughput screening for life-saving medicines.
Researchers have created a powerful DNA-peptide hybrid that could lead to advancements in nanotechnology and the study of Alzheimer's disease. The new structure combines three-stranded DNA and peptide structures, overcoming the challenge of chirality between these biomolecules.
Researchers have created a new liquid crystal compound with ultra-short helix pitch and spiral ordering, making it ideal for fast-switching devices. The material's thermally and chemically stable structure allows for easy customization of pitch lengths.
Researchers at Tokyo University of Science have developed a novel light-based method for rapidly racemizing chiral sulfoxides, a crucial step in producing desired enantiomers. This breakthrough utilizes photocatalysts to achieve rapid racemization under moderate conditions, bypassing the need for high temperatures previously required.
A novel cobalt-based catalyst successfully introduces a C-F chiral center in organic compounds, overcoming previous challenges. The catalyst achieves high yield and chirality without auxiliary groups or harsh conditions.
Researchers find that triangular-patterned materials can exhibit a mashup of three different phases, with each phase overlapping and competing for dominance. As temperature increases, the material becomes more ordered due to the breaking down of these competing electron arrangements.
Stabilized blue phase crystals could lead to new optical technologies with better response times. By using a core and shell structure, researchers were able to trap chiral liquid crystal in a 'blue phase' state, allowing for perfect, uniform crystals that can be controlled and predicted.
Researchers developed a novel spintronic-metasurface terahertz emitter that generates broadband, circularly polarized, and coherent terahertz waves. The design offers flexible manipulation of the polarization state and helicity with magnetic fields, enabling efficient generation and control of chiral terahertz waves.
Researchers from Shibaura Institute of Technology synthesized atropisomeric N-aryl quinazoline-4-thiones, showing unprecedented isotopic atropisomerism due to rotational restriction around an N-Ar bond. The findings support the formation of diastereomers and have potential applications in pharmaceuticals.
Researchers generate circularly polarized light at room temperature, a breakthrough for optical quantum information processing. The device uses strained semiconductors to produce twisting 'chiral' valley-polarized light, promising vast data storage capabilities.
A City University of Hong Kong physicist has observed the first unpaired singular Weyl magnetic monopole in a specific kind of single crystalline solid, defying the Nielsen-Ninomiya no-go theorem. The discovery opens up new avenues for understanding bulk topological properties and potential applications in spintronics.
A recent study has identified a nematode attractant in flax seeds, which can be used to develop sustainable and environmentally-friendly agriculture methods. The attractant, consisting of cell wall polysaccharides, is found to contain L-galactose sidechains that are critical for nematode attraction.
Researchers discovered false optical activity in Raman spectroscopic analysis of vitamin B12 and its derivatives, leading to misinterpretations of data. The phenomenon was attributed to circular dichroism and can be computationally modeled or adapted to measurement methods.
Scientists at Skoltech and KTH Royal Institute of Technology predict the existence of antichiral ferromagnetism, a nontrivial property of some magnetic crystals. This phenomenon could lead to unique magnetic domains and skyrmions, distinct from conventional chiral textures.
Researchers successfully synthesized crenarchaeol, a complex organic lipid found in archaea membranes. The correct structure reveals 22 chiral centers and an uncommon cyclohexane group, with implications for understanding oceanic nitrogen cycles and reconstructing past sea temperatures.
Researchers at Nagoya University have observed a new type of topological defect in chiral magnets, which has implications for fields of physics and technology. The team used Lorentz transmission electron microscopy to visualize the defects, revealing contrasting pairs of bright and dark areas.
Researchers at NTHU and IU developed a novel four-component coupling strategy for olefins, resulting in asymmetric radical trifluoromethylation. The reaction utilizes chiral VO species as catalysts under aerobic conditions, offering high diastereo-/enantio-controls and potential applications for biomedical compounds.
A team led by Dr. Shoufeng Lan is investigating the use of electromagnetic control over the synthesis of chiral compounds at an atomic level, which could lead to safer and cheaper pharmaceuticals. The researchers hope to create chiral seeds at the atomic scale and transfer chirality using cutting-edge technologies.
A Chinese-Australia collaboration successfully induced Dzyaloshinskii-Moriya interactions (DMI) in TaS2 by intercalating iron atoms, which can be further tuned by gate-induced proton intercalation. This enables electrical control of chiral spin textures and potential applications in energy-efficient spintronic devices.
Scientists demonstrated spatial distribution of circularly polarized light emitted by micro-spherical molecular assemblies, shedding light on helical molecular structures and chirality. This finding may inspire new versatile tools for studying molecular structure to enhance computer displays and everyday technologies.
Researchers developed a new EBSD-based method to determine enantiomorph distribution in polycrystalline materials, including the chiral elemental structure β-Mn. This simplifies the preparation of materials with defined handedness.
The study investigates chirality in magnetic structures, revealing a memory effect for helicity after phase transition to achiral state. Coauthors describe the importance of chirality in defects and dislocations.
Researchers from JAIST have synthesized high-performance BioNylons using itaconic acid and amino acids, which degrade under the pepsin enzyme found in mammal stomachs. These novel materials show improved thermal/mechanical performances compared to conventional nylons.
Physicists at FAU have confirmed the long-predicted chiral Faraday effect in an experiment using nickel helices. This breakthrough provides a new piece of fundamental magneto-optical theory and has implications for astrophysics and quantum electronics.
Researchers have advanced understanding of light-matter interactions in chiral materials with a magnetic field, confirming the magneto-chiral dichroism theory. The study provides detailed measurements and quantum-chemical calculations for two model systems, opening the door to future applications.
The Electron Ion Collider will take 3D images of electrons colliding with polarized protons and ions, shedding light on fundamental questions in nuclear physics. The collider's experimental equipment may also detect the elusive chiral magnetic effect, a crucial prediction for understanding the universe's matter-antimatter imbalance.
Chinese scientists summarize the latest progress of CPL-active organic micro-/nano-structures, which can reduce energy loss in displays and photonic technologies. The review discusses design principles, external stimuli regulation, and potential applications, including OLEDs, optical information recording, and sensing technologies.
Researchers have successfully created chiral objects using DNA origami and gold nanoparticles, exhibiting efficient energy transmission. The discovery enables potential applications in virus detection and optical computing, leveraging the unique properties of plasmonic transmitters.
A team at the Indian Institute of Science developed a catalytic version of the Fischer indole synthesis that primarily produces one enantiomer. The reaction involves a dynamic kinetic resolution mechanism with a chiral catalyst, resulting in moderate yields and good to excellent enantiomeric selectivity.
Scientists at Japan's National Institutes of Natural Sciences have successfully synthesized zigzag nanotubes using a novel method. This breakthrough enables the controlled production of all three types of nanotubes: armchair, chiral, and zigzag.
The researchers created a new sensor using two layers of nanopores that can detect specific enantiomers of chiral molecules, allowing for faster and cheaper detection than traditional methods. The sensor operates by exploiting surface plasmon resonance and takes less than 5 minutes to analyze.
Researchers developed a new type of LED that utilizes spintronics to produce circularly polarized light emission. The technology uses chiral molecules to self-assemble into standing arrays, which actively spin-polarize injected electrons and emit circularly polarized light.
Researchers at Hong Kong University of Science and Technology have developed a novel approach to synthesize chiral tetraarylmethanes, a type of spherical molecule. The new method enables efficient access to this previously underexplored chemical space, with promising activity against cancer cells and enterovirus.
Scientists create and experimentally realize a pair of class I acoustic 3D Dirac points, demonstrating surface state dispersion evolution toward Weyl points. The team also designs pseudospin-polarized interface states with chirality inversion, inspiring topological device design.
Researchers at USTC developed a mild and general nickel-catalysed asymmetric reductive hydroalkylation to synthesise chiral aliphatic amines. They achieved this by replacing equivalent metal reagents with olefins, facilitating carbon-carbon coupling under mild conditions.
Scientists at USTC developed a new technique to detect chiral structures using vortex light, which interacts with the structure's microstructure to produce significant scattering. This technique allows for monochromatic light detection and provides a novel method for studying chiral light-matter interactions.
Researchers developed a multidimensional vibrational circular dichroism system using a quantum cascade laser to analyze peptides containing D-amino acid residues. The instrument achieves high intensity and narrow focusing, allowing for the detection of chiral components in proteins.
Researchers have developed a method to synthesize N-C axially chiral compounds, which have promising applications in medicine and agriculture. The team's breakthrough enables the creation of highly enantioselective syntheses using chiral catalysts, leading to potentially useful compounds with therapeutic properties.
Scientists at Nagoya Institute of Technology have developed a new method for synthesizing chiral N,N-acetals, which are crucial components in diuretic drugs and other bioactive compounds. The method uses diketones as starting materials and produces high enantiopurity with yields up to 99%.
Researchers at the University of Tokyo have designed a new tetrahedral 'chiral zinc' molecule with exceptional stability and catalytic activity. This discovery could lead to breakthroughs in pharmaceuticals and optical electronics by allowing for more efficient synthesis of chiral molecules, which are essential for many drugs.
Scientists have developed a method to predict the specific colors of thin films made from combining any of the 466 varieties of single-walled carbon nanotubes. The research shows that the thinnest and most colorful tubes affect visible light more than those with larger diameters and faded colors.
A joint research project has achieved a new milestone in ultra-fast control of magnetism by investigating femtosecond time-resolved x-ray scattering signals. The results indicate a faster recovery of chiral order compared to collinear magnetic order dynamics, suggesting that twists are more stable than straight magnetic configurations.
Researchers developed a new photodiode that can detect circularly polarized light without a filter, enabling higher sensitivity and miniaturization. This technology has the potential to reveal previously unidentified information about object surfaces, including stress intensity and distribution.
Researchers have efficiently generated chiral terahertz waves with adjustable polarization, enabling the development of ultrafast opto-spintronics and information encryption applications. The generation process utilizes a three-dimensional topological insulator of bismuth telluride (Bi2Te3) nanofilms driven by femtosecond laser pulses.
Scientists at Tokyo Tech and ICFO develop a method to generate circularly polarized light from a sphere by breaking its symmetry through electron beam excitation. This enables the precise control of phase and polarization, paving the way for novel quantum communication and encryption technologies. The approach has been experimentally v...
Researchers have demonstrated the use of elastic vibrations to manipulate the spin states of optically active color centers in SiC at room temperature. The findings show a non-trivial dependence on the spin quantization direction, enabling chiral spin-acoustic resonances and full control of spin states without external microwave fields.
Researchers discuss theoretical frameworks for electromagnetic chirality in chiral materials and fields, enabling understanding of complex chiroptical phenomena. Chirality is a qualitative property but measurable quantities can be described using chiroptical parameters.
Scientists discovered that the ratio of chiral alpha-pinene molecules varies with altitude, time of day, and season in the Amazon rainforest. Insects, particularly termites, are found to be a significant source of plus-alpha-pinene, previously unknown in forest emissions.
Researchers simulated a 3D chiral topological insulator using nitrogen-vacancy centers, observing dynamical bulk-surface correspondence and symmetry protection in momentum space. They measured spin textures on band inversion surfaces, revealing perfect (broken) topology depending on the preserved or broken chiral symmetry.
Physicists at the University of Bath have accurately measured and characterised a single, twisted nanoparticle using a new method, taking them closer to producing medicines on demand. The discovery could lead to mini-labs that can mix substances in a completely new way, producing pharmaceuticals from minute droplets of active ingredients.
Researchers at the University of Chicago have developed a way to stretch and strain liquid crystals to generate different colors, leading to a wide range of optical effects. This technology has potential applications in temperature and strain sensors, enabling remote measurement without contact.
Researchers have observed that palladium gallium (PdGa) reaches the maximum allowed Chern number of four, a fundamental aspect yet to be settled in topological physics. The team also demonstrated control over the sign of the Chern number by manipulating the crystal's handedness during growth.
Researchers developed a platform for rapid chiral analysis, producing chromatogram-like output without separation. The method effectively resolved a wide range of chiral molecules, including pharmaceuticals and biomolecules.
A Cornell-led collaboration has developed a new electrochemical reaction that enables the creation of chiral molecules, crucial for drug synthesis. The breakthrough could lead to the manufacture of a host of new, low-cost drugs with improved efficacy and reduced production costs.
Researchers at GIST designed new chiral ligands to generate useful compounds in a single step, achieving high enantioselectivity and efficiency. The novel catalytic reaction paves the way for synthesizing novel drugs and natural products with numerous bioactivities.