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Journal articles on the topic 'Chiral Geometries'

Author: Grafiati

Published: 6 September 2023

Last updated: 7 September 2023

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1

De Santo, Maria Penelope, Lorenza Spina, and Federica Ciuchi. "Chiral Chromonics Confined in Spherical Geometries." Applied Sciences 13, no. 7 (2023): 4507. http://dx.doi.org/10.3390/app13074507.

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Chromonic liquid crystals have recently received a lot of attention due to their spontaneous self-assembly in supramolecular columnar structures that, depending on their concentration in water, align to form a nematic liquid crystalline phase. The chirality may be induced in chromonics by adding chiral moieties to the nematic phase or enhanced by confining them in curved geometrical constraints. This review summarizes the recent research developments on chiral chromonic liquid crystals confined in spherical geometry, relating the results to what was observed for thermotropic liquid crystals in

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2

Leemans, Dimitri, and Philippe Tranchida. "On residual connectedness in chiral geometries." Algebraic Combinatorics 4, no. 3 (2021): 491–99. http://dx.doi.org/10.5802/alco.162.

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3

Lowe, David A., and Shubho Roy. "Chiral geometries of (2+1)-d AdS gravity." Physics Letters B 668, no. 2 (2008): 159–62. http://dx.doi.org/10.1016/j.physletb.2008.08.026.

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4

Öeren, Mario, Elena Shmatova, Toomas Tamm, and Riina Aav. "Computational and ion mobility MS study of (all-S)-cyclohexylhemicucurbit[6]uril structure and complexes." Phys. Chem. Chem. Phys. 16, no. 36 (2014): 19198–205. http://dx.doi.org/10.1039/c4cp02202e.

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5

Ma, Wei, Changlong Hao, Maozhong Sun, Liguang Xu, Chuanlai Xu, and Hua Kuang. "Tuning of chiral construction, structural diversity, scale transformation and chiroptical applications." Materials Horizons 5, no. 2 (2018): 141–61. http://dx.doi.org/10.1039/c7mh00966f.

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Dissymmetry is crucial for chiral geometries that utilize either intrinsic anisotropy forces around nanoparticles (NPs) or external organization associated with templates or applied fields and alignment.

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Chen, Sicong, Qiwen Teng та Shi Wu. "Theoretical studies on the binding affinities of β-cyclodextrin to small molecules and monosaccharides". Open Chemistry 4, № 2 (2006): 223–33. http://dx.doi.org/10.2478/s11532-006-0013-5.

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AbstractEquilibrium geometries and electronic structures of complexes between β-cyclodextrin (β-CD) and some small molecules as well as monosaccharides were investigated by Austin Model 1 (AM1) to obtain binding energy of the complexes. It was indicated that β-CD could bind the structurally similar solvent molecules and monosaccharides because of the negative binding energy of the complexes, and especially could show the chiral binding ability to monosaccharides with more hydroxyl groups, due to its chiral characteristics. The complexes were stabilized by the hydrogen bonding between β-CD and

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7

Skolnick, Jeffrey, Hongyi Zhou, and Mu Gao. "On the possible origin of protein homochirality, structure, and biochemical function." Proceedings of the National Academy of Sciences 116, no. 52 (2019): 26571–79. http://dx.doi.org/10.1073/pnas.1908241116.

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Living systems have chiral molecules, e.g., native proteins that almost entirely contain L-amino acids. How protein homochirality emerged from a background of equal numbers of L and D amino acids is among many questions about life’s origin. The origin of homochirality and its implications are explored in computer simulations examining the stability and structural and functional properties of an artificial library of compact proteins containing 1:1 (termed demi-chiral), 3:1, and 1:3 ratios of D:L and purely L or D amino acids generated without functional selection. Demi-chiral proteins have sho

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8

Cirilo-Lombardo, Diego Julio. "Born-Infeld generalization: Axion and Kalb-Ramond from dynamical torsion fields." Europhysics Letters 135, no. 6 (2021): 61001. http://dx.doi.org/10.1209/0295-5075/ac2cfa.

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Abstract We show that in theories of gravitation based on affine geometries the torsion field, that takes a dynamical character, not only the chiral magnetic effect (CME) intervenes in the wash up of the chiral anomaly but also the chiral vortical effect (CVE) and the coupled chiral effect (CCE) coming from the hypermagnetic field interaction with the primordial plasma are crucial in a realistic physical scenario, as in the case of the early universe. We also show that the equation governing the wash up takes the form given in this paper, supplemented with the dynamical equation for the torsio

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9

BRACKEN, PAUL. "LINKS BETWEEN THE QUANTUM HALL EFFECT, CHIRAL BOSON THEORIES AND STRING THEORY." International Journal of Modern Physics E 13, no. 05 (2004): 961–71. http://dx.doi.org/10.1142/s021830130400251x.

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Chiral boson theory is introduced and its relevance to the quantum Hall effect is explained. It is shown that the chiral boson theory admits mode expansions which are essentially those which appear and are made use of in bosonic string theories. This immediately leads to a way of quantizing the theory. Restrictions on various parameters appearing in the model can be imposed in a natural way. Finally, it is suggested that some of these ideas have important applications to other geometries which could give rise to new types of physical behavior.

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10

Sevrin, Alexander, Wieland Staessens, and Alexander Wijns. "AnN= 2 worldsheet approach to D-branes in bihermitian geometries: I. Chiral and twisted chiral fields." Journal of High Energy Physics 2008, no. 10 (2008): 108. http://dx.doi.org/10.1088/1126-6708/2008/10/108.

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11

Rozanski, S. A., L. Naji, F. Kremer, and R. Stannarius. "Influence of Confining Geometries on Collective Dynamic Modes in Chiral Smectogens." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 329, no. 1 (1999): 483–90. http://dx.doi.org/10.1080/10587259908025972.

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12

Buß, Volker, Verena Haas, and Ute Wingen. "Strukturuntersuchungen an chiralen Schiff-Basen des 11-cis-Retinals/Structure Investigation of Chiral Schiff Bases of 11-cis-Retinal." Zeitschrift für Naturforschung B 44, no. 3 (1989): 333–44. http://dx.doi.org/10.1515/znb-1989-0315.

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CD and UV spectra of four chiral 11-cis-retinal Schiff bases obtained by condensing the aldehyde with asymmetric amines are used to gain structural information about the polyene conformation. The spectra are temperature-dependent indicating the same 12-s-cis/trans equilibrium as in 11-cis-retinal. In addition, CD absorptions arise at lower temperatures whose only origin is the inherent dissymmetric nature of the retinylidene Chromophore. CNDO /S-calculations performed on the basis of force-field optimized geometries give results which can partially be rationalized on the basis of experimental

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13

Jang, Dongmin, Yoonbai Kim, O.-Kab Kwon, and D. D. Tolla. "Exact Holography of Massive M2-brane Theories and Entanglement Entropy." EPJ Web of Conferences 168 (2018): 07002. http://dx.doi.org/10.1051/epjconf/201816807002.

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We test the gauge/gravity duality between the N = 6 mass-deformed ABJM theory with Uk(N) × U-k(N) gauge symmetry and the 11-dimensional supergravity on LLM geometries with SO(4)=ℤk × SO(4)=ℤk isometry. Our analysis is based on the evaluation of vacuum expectation values of chiral primary operators from the supersymmetric vacua of mass-deformed ABJM theory and from the implementation of Kaluza-Klein (KK) holography to the LLM geometries. We focus on the chiral primary operator (CPO) with conformal dimension Δ = 1. The non-vanishing vacuum expectation value (vev) implies the breaking of conforma

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14

Sereda, Olha, and Helen Stoeckli-Evans. "Crystal structures of {[Cu(Lpn)2][Fe(CN)5(NO)]·H2O}nand {[Cu(Lpn)2]3[Cr(CN)6]2·5H2O}n[where Lpn = (R)-propane-1,2-diamine]: two heterometallic chiral cyanide-bridged coordination polymers." Acta Crystallographica Section E Crystallographic Communications 71, no. 4 (2015): 392–97. http://dx.doi.org/10.1107/s2056989015005253.

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The title compounds,catena-poly[[[bis[(R)-propane-1,2-diamine-κ2N,N′]copper(II)]-μ-cyanido-κ2N:C-[tris(cyanido-κC)(nitroso-κN)iron(III)]-μ-cyanido-κ2C:N] monohydrate], {[Cu(Lpn)2][Fe(CN)5(NO)]·H2O}n, (I), and poly[[hexa-μ-cyanido-κ12C:N-hexacyanido-κ6C-hexakis[(R)-propane-1,2-diamine-κ2N,N′]dichromium(III)tricopper(II)] pentahydrate], {[Cu(Lpn)2]3[Cr(CN)6]2·5H2O}n, (II) [where Lpn = (R)-propane-1,2-diamine, C3H10N2], are new chiral cyanide-bridged bimetallic coordination polymers. The asymmetric unit of compound (I) is composed of two independent cation–anion units of {[Cu(Lpn)2][Fe(CN)5)(NO)]

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15

Pang, Xiaojuan, Chenwei Jiang, Yongnan Qi, et al. "Ultrafast unidirectional chiral rotation in the Z–E photoisomerization of two azoheteroarene photoswitches." Physical Chemistry Chemical Physics 20, no. 40 (2018): 25910–17. http://dx.doi.org/10.1039/c8cp04762f.

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Based on a large number of trajectories starting from the Z-isomer, for both azoheteroarenes, more than 99% of the trajectories decay through conical intersections with the same helicities as their initial geometries.

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16

Bracho, Javier, Isabel Hubard, and Daniel Pellicer. "Chiral Polyhedra in 3-Dimensional Geometries and from a Petrie–Coxeter Construction." Discrete & Computational Geometry 66, no. 3 (2021): 1025–52. http://dx.doi.org/10.1007/s00454-021-00317-0.

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17

Zeng, Yang, Federico Masini, Anton M. H. Rasmussen, et al. "The most stable adsorption geometries of two chiral modifiers on Pt(111)." Surface Science 676 (October 2018): 17–22. http://dx.doi.org/10.1016/j.susc.2018.02.008.

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18

Benito-Garagorri, David, Kurt Mereiter, and Karl Kirchner. "Synthesis and Characterization of Ni(II) and Pd(II) Complexes Bearing Achiral and Chiral Bidentate Aminophosphine Ligands." Collection of Czechoslovak Chemical Communications 72, no. 4 (2007): 527–40. http://dx.doi.org/10.1135/cccc20070527.

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The synthesis of a range of achiral and chiral bidentate aminophosphine ligands and their complexes with nickel(II) and palladium(II) has been investigated. The ligands and the complexes have been characterized by NMR spectroscopy, and X-ray structures of representative compounds have been determined. In addition, DFT calculations have been performed to investigate different geometries of the nickel(II) complexes in the solid state and in solution.

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19

Lorenzo, Salvatore, Benedetto Militello, Anna Napoli, Roberta Zambrini, and G. Massimo Palma. "Quantum synchronisation and clustering in chiral networks." New Journal of Physics 24, no. 2 (2022): 023030. http://dx.doi.org/10.1088/1367-2630/ac51a9.

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Abstract We study the emergence of synchronisation in a chiral network of harmonic oscillators. The network consists of a set of locally incoherently pumped harmonic oscillators coupled pairwise in cascade with travelling field modes. Such cascaded coupling leads to feedback-less dissipative interaction between the harmonic oscillators of the pair which can be described in terms of an effective pairwise Hamiltonian a collective pairwise decay. The network is described mathematically in terms of a directed graph. By analysing geometries of increasing complexity we show how the onset of synchron

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20

Dincer, Furkan, Oguzhan Akgol, Muharrrem Karaaslan, Emin Unal, Ekrem Demirel, and Cumali Sabah. "New generation chiral metamaterials based on omega resonators with small and smooth chirality over a certain frequency band." Modern Physics Letters B 30, no. 05 (2016): 1650040. http://dx.doi.org/10.1142/s0217984916500408.

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In this paper, we have designed, simulated and analyzed a new generation chiral metamaterials (MTMs) with two geometries. There are various types of chiral MTM structures in the literature and almost all of them are indented to be designed for high level of chirality. In fact, small chirality and its application areas were mostly ignored by researchers. In this sense, our study is one of the pioneer works for this type of research. Each structure based on omega resonators (ORs) with small chirality value is investigated both numerically and experimentally. The results are in very good agreemen

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21

Rubino, S., P. Schattschneider, M. Stöger-Pollach, et al. "Energy-loss magnetic chiral dichroism (EMCD): Magnetic chiral dichroism in the electron microscope." Journal of Materials Research 23, no. 10 (2008): 2582–90. http://dx.doi.org/10.1557/jmr.2008.0348.

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A new technique called energy-loss magnetic chiral dichroism (EMCD) has recently been developed [P. Schattschneider, et al. Nature441, 486 (2006)] to measure magnetic circular dichroism in the transmission electron microscope (TEM) with a spatial resolution of 10 nm. This novel technique is the TEM counterpart of x-ray magnetic circular dichroism, which is widely used for the characterization of magnetic materials with synchrotron radiation. In this paper we describe several experimental methods that can be used to measure the EMCD signal [P. Schattschneider, et al. Nature441, 486 (2006); C. H

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22

GUNARA, BOBBY E., FREDDY P. ZEN, FIKI T. AKBAR, AGUS SUROSO, and ARIANTO. "SOME ASPECTS OF SPHERICAL SYMMETRIC EXTREMAL DYONIC BLACK HOLES IN 4D N = 1 SUPERGRAVITY." International Journal of Modern Physics A 28, no. 18 (2013): 1350084. http://dx.doi.org/10.1142/s0217751x1350084x.

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In this paper, we study several aspects of extremal spherical symmetric black hole solutions of four-dimensional N = 1 supergravity coupled to vector and chiral multiplets with the scalar potential turned on. In the asymptotic region, the complex scalars are fixed and regular which can be viewed as the critical points of the black hole and the scalar potentials with vanishing scalar charges. It follows that the asymptotic geometries are of a constant and nonzero scalar curvature which are generally not Einstein. These spaces could also correspond to the near horizon geometries which are the pr

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23

Korytár, Richard, and Ferdinand Evers. "Current-induced mechanical torque in chiral molecular rotors." Beilstein Journal of Nanotechnology 14 (June 12, 2023): 711–21. http://dx.doi.org/10.3762/bjnano.14.57.

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There has been great endeavor to engineer molecular rotors operated by an electrical current. A frequently met operation principle is the transfer of angular momentum taken from the incident flux. In this paper, we present an alternative driving agent that works also in situations where angular momentum of the incoming flux is conserved. This situation arises typically with molecular rotors that exhibit an easy axis of rotation. For quantitative analysis we investigate here a classical model where molecule and wires are represented by a rigid curved path. We demonstrate that in the presence of

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24

Ferreira-Gomes, Bruno, Osvaldo N. Oliveira, and Jorge Ricardo Mejía-Salazar. "Chiral Dielectric Metasurfaces for Highly Integrated, Broadband Circularly Polarized Antenna." Sensors 21, no. 6 (2021): 2071. http://dx.doi.org/10.3390/s21062071.

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We report on the design of a low-profile integrated millimeter-wave antenna for efficient and broadband circularly polarized electromagnetic radiation. The designed antenna comprises a chiral dielectric metasurface built with a 2×2 arrangement of dielectric cylinders with slanted-slots at the center. A broadbeam high-gain with wide axial ratio (AR)<3 dB bandwidth was reached by pairing the electric and magnetic resonances of the dielectric cylinders and the slanted slots when excited by an elliptically polarized driven-patch antenna. This electric-magnetic pairing can be tuned by varying th

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25

Terasaki, Osamu, Zheng Liu, Tetsu Ohsuna, Hyun June Shin, and Ryong Ryoo. "Electron Microscopy Study of Novel Pt Nanowires Synthesized in the Spaces of Silica Mesoporous Materials." Microscopy and Microanalysis 8, no. 1 (2002): 35–39. http://dx.doi.org/10.1017/s1431927602010073.

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Structures of Pt-nanowires, synthesized in channels of silica mesoporous materials MCM-41, SBA-15 and MCM-48, were investigated by transmission electron microscopy. One dimensional (1D) Pt-nanowires were formed inside the channels of the MCM-41, and were single crystals with a length of several tens to several hundreds nanometers and a diameter of ca. 3 nm Pt-nanowires synthesized in SBA-15 formed a new 3D-network following 3D-pore geometry of SBA-15; that is, the main 1D-channels are interconnected to each other through randomly distributed tunnels. These Pt-nanowires showed a well single cry

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Știufiuc, Gabriela Fabiola, Valentin Toma, Anca Onaciu, Vasile Chiș, Constantin Mihai Lucaciu, and Rareș Ionuț Știufiuc. "Proving Nanoscale Chiral Interactions of Cyclodextrins and Propranolol Enantiomers by Means of SERS Measurements Performed on a Solid Plasmonic Substrate." Pharmaceutics 13, no. 10 (2021): 1594. http://dx.doi.org/10.3390/pharmaceutics13101594.

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Chiral separation is an important issue for the pharmaceutical industry. Over the years, several separation methods have been developed, mainly based on chromatography. Their working principle is based on the formation of transient diastereoisomers, but the very subtle nanoscale interactions responsible for separation are not always understood. Recently, Raman and surface-enhanced Raman (SERS) spectroscopy have provided promising results in this field. Here we present Raman/SERS experimental data that provide useful information concerning the nanoscale interactions between propranolol enantiom

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27

Golze, Spencer D., Stefania Porcu, Chen Zhu, et al. "Sequential Symmetry-Breaking Events as a Synthetic Pathway for Chiral Gold Nanostructures with Spiral Geometries." Nano Letters 21, no. 7 (2021): 2919–25. http://dx.doi.org/10.1021/acs.nanolett.0c05105.

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28

Ito, Jun-ichi, Takahiro Ishihara, Takaki Fukuoka, Siti Rokiah Binti Mat Napi, Hajime Kameo, and Hisao Nishiyama. "Modulation of the coordination geometries of NCN and NCNC Rh complexes for ambidextrous chiral catalysts." Chemical Communications 55, no. 85 (2019): 12765–68. http://dx.doi.org/10.1039/c9cc06520b.

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29

Pointner, Andreas, and Rudolf Herrmann. "Transition State Geometry and Solvent Effects in the Enantioselective Oxidation of Sulfides to Chiral Sulfoxides by Oxaziridines." Zeitschrift für Naturforschung B 50, no. 9 (1995): 1396–403. http://dx.doi.org/10.1515/znb-1995-0917.

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AbstractFor the enantioselective oxidation of methyl phenyl sulfide and tert-butyl methyl sulfide to the corresponding chiral sulfoxides by 3,3-dibromo-(camphorsulfonyl)oxaziridine, semiempirical calculations (MNDO, AMI, PM3) concerning transition state geometries were performed. The results show that only PM3 is able to localize a transition state. For methyl phenyl sulfide, a spiro arrangement of the oxaziridine ring and the sulfur atom explains the observed direction of the selectivity better than a planar transition state. The solvent dependence of the observed enantioselectivity is relate

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30

Øwre, Anders, Morten Vinum, Michal Kern, Joris van Slageren, Jesper Bendix, and Mauro Perfetti. "Chiral, Heterometallic Lanthanide–Transition Metal Complexes by Design." Inorganics 6, no. 3 (2018): 72. http://dx.doi.org/10.3390/inorganics6030072.

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Achieving control over coordination geometries in lanthanide complexes remains a challenge to the coordination chemist. This is particularly the case in the field of molecule-based magnetism, where barriers for magnetic relaxation processes as well as tunneling pathways are strongly influenced by the lanthanide coordination geometry. Addressing the challenge of design of 4f-element coordination environments, the ubiquitous Ln(hfac)3 moieties have been shown to be applicable as Lewis acids coordinating transition metal acetylacetonates facially leading to simple, chiral lanthanide–transition me

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Vassakis, Emmanouil, Ioannis Orfanos, Ioannis Liontos, and Emmanouil Skantzakis. "Generation of Energetic Highly Elliptical Extreme Ultraviolet Radiation." Photonics 8, no. 9 (2021): 378. http://dx.doi.org/10.3390/photonics8090378.

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In this study, the generation of energetic coherent extreme ultraviolet (XUV) radiation with the potential for controlled polarization is reported. The XUV radiation results from the process of high harmonic generation (HHG) in a gas phase atomic medium, driven by an intense two-color circularly polarized counter-rotating laser field, under loose focusing geometry conditions. The energy of the XUV radiation emitted per laser pulse is found to be of the order of ~100 nJ with the spectrum spanning from 17 to 26 eV. The demonstrated energy values (along with tight XUV focusing geometries) are suf

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32

Saberi, Ingmar, and Brian R. Williams. "Twisted characters and holomorphic symmetries." Letters in Mathematical Physics 110, no. 10 (2020): 2779–853. http://dx.doi.org/10.1007/s11005-020-01319-4.

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Abstract We consider holomorphic twists of arbitrary supersymmetric theories in four dimensions. Working in the BV formalism, we rederive classical results characterizing the holomorphic twist of chiral and vector supermultiplets, computing the twist explicitly as a family over the space of nilpotent supercharges in minimal supersymmetry. The BV formalism allows one to work with or without auxiliary fields, according to preference; for chiral superfields, we show that the result of the twist is an identical BV theory, the holomorphic $$\beta \gamma $$ β γ system with superpotential, independen

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Nair, Greshma, Haobijam Johnson Singh, Debadrita Paria, Murugesan Venkatapathi, and Ambarish Ghosh. "Plasmonic Interactions at Close Proximity in Chiral Geometries: Route toward Broadband Chiroptical Response and Giant Enantiomeric Sensitivity." Journal of Physical Chemistry C 118, no. 9 (2014): 4991–97. http://dx.doi.org/10.1021/jp4117535.

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Zhang, Xin Wei, Cun Li, and Jun Qi Xu. "Study on the Second-Order Nonlinear Optical Properties of [6]Helicenes with Chromophores." Applied Mechanics and Materials 303-306 (February 2013): 2563–66. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2563.

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A series of chiral [6]helicenes have been designed using the molecular engineering of organic nonlinear optical materials. The geometries of [6]helicenes 1, 2, 3, 4,5 are optimized using density functional theory (DFT-B3LYP) method at the 6-31g (d, p) basis set level. Based on the obtained stable molecular configuration, we adopt the TDHT/PM3 method and time-dependent density-functional theory (TD-DFT) to calculate the nonlinear optical (NLO) properties and electronic spectra of these molecules. Results show that the static hyperpolarizability βµ alternates between positive value and negative

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Starodubtsev, Evgenii. "Reflection and transmission of nanoresonators including bi-isotropic and metamaterial layers: opportunities to control and amplify chiral and nonreciprocal effects for nanophotonics applications." EPJ Applied Metamaterials 10 (2023): 5. http://dx.doi.org/10.1051/epjam/2023002.

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Electromagnetic waves reflected from and transmitted through the multilayer nanoresonators including the main layer made of a bi-isotropic material or metamaterial sandwiched between dielectric, epsilon-near-zero or metallic spacer layers have been analytically modeled. The numerical and graphical analysis, based on the exact solution of the electromagnetic boundary problem, confirms opportunities to use such nanoresonators as utracompact polarization converters. The proposed systems are characterized by wide ranges of parameters and significantly reduced (subwavelength) thicknesses. The space

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Wang, Yuekui, and Chunxia Zhang. "Theoretical Analysis of the Unusual Vicinal Effects on Electronic Circular Dichroism Spectra of Cobalt(III) Complexes with ED3A-Type and Related Ligands." Zeitschrift für Naturforschung A 69, no. 7 (2014): 371–84. http://dx.doi.org/10.5560/zna.2014-0032.

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To investigate the origin of unusual N-vicinal effects, the geometries of the two series of cobalt(III) complexes, [Co(ED3A-type)(X)]-(X = CN-, NO2-) and [Co(EDDS-type)]-, with the pentadentate ethylenediamine-N;N;N0-triacetate (ED3A), hexadentate (S,S)-ethylenediamine-N;N0-dissuccinate (EDDS), and their N-alkyl-substituted ligands in aqueous solution have been optimized at the DFT/B3P86/6-311++G(2d,p) level of theory. Based on the optimized geometries, the excitation energies and rotational strengths have been calculated using the time dependent density functional theory (TDDFT) method with t

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Bocian, Wojciech, Elżbieta Bednarek та Katarzyna Michalska. "Explanation of the Formation of Complexes between Representatives of Oxazolidinones and HDAS-β-CD Using Molecular Modeling as a Complementary Technique to cEKC and NMR". International Journal of Molecular Sciences 22, № 13 (2021): 7139. http://dx.doi.org/10.3390/ijms22137139.

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Molecular modeling (MM) results for tedizolid and radezolid with heptakis-(2,3-diacetyl-6-sulfo)-β-cyclodextrin (HDAS-β-CD) are presented and compared with the results previously obtained for linezolid and sutezolid. The mechanism of interaction of chiral oxazolidinone ligands belonging to a new class of antibacterial agents, such as linezolid, tedizolid, radezolid, and sutezolid, with HDAS-β-CD based on capillary electrokinetic chromatography (cEKC), nuclear magnetic resonance (NMR) spectroscopy, and MM methods was described. Principles of chiral separation of oxazolidinone analogues using ch

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Govorov, Alexander O. "Plasmon-Induced Circular Dichroism of a Chiral Molecule in the Vicinity of Metal Nanocrystals. Application to Various Geometries." Journal of Physical Chemistry C 115, no. 16 (2011): 7914–23. http://dx.doi.org/10.1021/jp1121432.

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Zhuo, Wang, Shulin Sun, Qiong He, and Lei Zhou. "A review of high-efficiency Pancharatnam–Berry metasurfaces." Terahertz Science and Technology 13, no. 3 (2020): 73–89. http://dx.doi.org/10.1051/tst/2020133073.

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Manipulating circularly polarized (CP) electromagnetic waves as desired is important for a wide range of applications ranging from chiral-molecule manipulations to optical communication, but conventional natural-materials-based devices suffer from bulky configuration and low efficiencies. Recently, Pancharatnam–Berry (PB) metasurfaces have demonstrated strong capabilities to control CP waves in different frequency domains. In this article, we present a concise review on PB metasurfaces for CP light manipulations, focusing mainly on the research works done by our own group. After briefly introd

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Liu, Ya-Ling, Pei Zou, Hao Wu, Min-Hao Xie та Shi-Neng Luo. "3,4,6-Tri-O-acetyl-1,2-O-[1-(exo-ethoxy)ethylidene]-β-D-mannopyranose 0.11-hydrate". Acta Crystallographica Section C Crystal Structure Communications 68, № 9 (2012): o338—o340. http://dx.doi.org/10.1107/s0108270112032076.

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The title compound, C16H24O10·0.11H2O, is a key intermediate in the synthesis of 2-deoxy-2-[18F]fluoro-D-glucose (18F-FDG), which is the most widely used molecular-imaging probe for positron emission tomography (PET). The crystal structure has two independent molecules (AandB) in the asymmetric unit, with closely comparable geometries. The pyranose ring adopts a4C1conformation [Cremer–Pople puckering parameters:Q= 0.553 (2) Å, θ = 16.2 (2)° and ϕ = 290.4 (8)° for moleculeA, andQ= 0.529 (2) Å, θ =15.3 (3)° and ϕ = 268.2 (9)° for moleculeB], and the dioxolane ring adopts an envelope conformation

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Shastry, B. Sriram, and Boris I. Shraiman. "Raman Scattering in Mott-Hubbard Systems." International Journal of Modern Physics B 05, no. 01n02 (1991): 365–88. http://dx.doi.org/10.1142/s0217979291000237.

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We present a theory of Raman Scattering in the Hubbard model. The scattering of light has resonant and non-resonant contributions. The resonant term gives rise to scattering by spin degrees of freedom in the insulating case, for which we derive a general form of the effective scattering Hamiltonian. The later involves four terms with distinct symmetry properties, one of them being the “chiral” spin operator ∑ Si · (Sj×Sk). The corresponding four distinct correlation function can be measured directly in the experiments with different scattering geometries. The nonresonant term contributes to th

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Miranda, Alexandre S., Paula M. Marcos, José R. Ascenso, et al. "Dihomooxacalix[4]arene-Based Fluorescent Receptors for Anion and Organic Ion Pair Recognition." Molecules 25, no. 20 (2020): 4708. http://dx.doi.org/10.3390/molecules25204708.

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Fluorescent dihomooxacalix[4]arene-based receptors 5a–5c, bearing two naphthyl(thio)ureido groups at the lower rim via a butyl spacer, were synthesised and obtained in the cone conformation in solution. The X-ray crystal structures of 1,3- (5a) and 3,4-dinaphthylurea (5b) derivatives are reported. Their binding properties towards several anions of different geometries were assessed by 1H-NMR, UV-Vis absorption and fluorescence titrations. Structural and energetic insights of the naphthylurea 5a and 5b complexes were also obtained using quantum mechanical calculations. The data showed that all

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Novotná, Vladimíra, Lubor Lejček, Věra Hamplová, and Jana Vejpravová. "Defect Structures of Magnetic Nanoparticles in Smectic A Liquid Crystals." Molecules 26, no. 18 (2021): 5717. http://dx.doi.org/10.3390/molecules26185717.

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Topological defects in anisotropic fluids like liquid crystals serve as a playground for the research of various effects. In this study, we concentrated on a hybrid system of chiral rod-like molecules doped by magnetic nanoparticles. In textures of the smectic A phase, we observed linear defects and found that clusters of nanoparticles promote nucleation of smectic layer defects just at the phase transition from the isotropic to the smectic A (SmA) phase. In different geometries, we studied and analysed creation of defects which can be explained by attractive elastic forces between nanoparticl

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Sortino, S., G. De Guidi, S. Fazio, S. Giuffrida, M. G. Salemi та S. Monti. "On the absorption and emission properties of three new non-steroidal anti-inflammatory drugs-β-cyclodextrin host-guest inclusion complexes: differentiated sensitivity to the microenvironment upon light excitation". International Journal of Photoenergy 1, № 1 (1999): 19–23. http://dx.doi.org/10.1155/s1110662x99000045.

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The effects ofβ-cyclodextrin (β-CD) complexation on the absorption and emission properties of the non-steroidal anti-inflammatory drugs tolmetin (TM), diflunisal (DF), and fenbufen (FB) have been investigated. The absorption spectra of all these compounds are only slightly affected by the addition ofβ-CD. In contrast, the emission properties were markedly influenced by CD complexation and in a different manner for the three compounds due to a differentiated sensitivity of the excited drugs to the microenvironment. The complexes are all characterised by a 1: 1 stoichiometry and two different in

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Komen, Irina, Sabrya E. van Heijst, Martin Caldarola, Sonia Conesa-Boj, and L. Kuipers. "Revealing the nanogeometry of WS₂ nanoflowers by polarization-resolved Raman spectroscopy." Journal of Applied Physics 132, no. 17 (2022): 173103. http://dx.doi.org/10.1063/5.0102381.

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Recent studies of transition metal dichalcogenides (TMDs) have revealed exciting optical properties, such as stable excitons and chiral light–matter interactions. Chemical vapor deposition techniques provide a platform for the fabrication of nanostructures with diverse geometries, ranging from horizontal flakes to flower-like structures. Raman spectroscopy is commonly used to characterize TMDs and their properties. Here, we use polarization-resolved Raman spectroscopy to probe the nanogeometry and orientation of [Formula: see text] nanoflower petals. Exciting the nanoflowers with linearly pola

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Planas, Ferran, Michael J. McLeish, and Fahmi Himo. "Computational characterization of enzyme-bound thiamin diphosphate reveals a surprisingly stable tricyclic state: implications for catalysis." Beilstein Journal of Organic Chemistry 15 (January 16, 2019): 145–59. http://dx.doi.org/10.3762/bjoc.15.15.

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Thiamin diphosphate (ThDP)-dependent enzymes constitute a large class of enzymes that catalyze a diverse range of reactions. Many are involved in stereospecific carbon–carbon bond formation and, consequently, have found increasing interest and utility as chiral catalysts in various biocatalytic applications. All ThDP-catalyzed reactions require the reaction of the ThDP ylide (the activated state of the cofactor) with the substrate. Given that the cofactor can adopt up to seven states on an enzyme, identifying the factors affecting the stability of the pre-reactant states is important for the o

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Donnelly, Claire, Aurelio Hierro-Rodríguez, Claas Abert, et al. "Complex free-space magnetic field textures induced by three-dimensional magnetic nanostructures." Nature Nanotechnology 17, no. 2 (2021): 136–42. http://dx.doi.org/10.1038/s41565-021-01027-7.

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AbstractThe design of complex, competing effects in magnetic systems—be it via the introduction of nonlinear interactions1–4, or the patterning of three-dimensional geometries5,6—is an emerging route to achieve new functionalities. In particular, through the design of three-dimensional geometries and curvature, intrastructure properties such as anisotropy and chirality, both geometry-induced and intrinsic, can be directly controlled, leading to a host of new physics and functionalities, such as three-dimensional chiral spin states7, ultrafast chiral domain wall dynamics8–10 and spin textures w

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Jaycox, Gary D. "Stimuli-Responsive Polymers VI. Azobenzene Modified Copolyaramides with Chiral Helical Geometries: Influence of Rigid, Helix-Disrupting Segments on Physiochemical and Chiroptical Behavior." Polymer Journal 34, no. 4 (2002): 280–90. http://dx.doi.org/10.1295/polymj.34.280.

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Fantuzzi, Nicholas, Patrizia Trovalusci, and Raimondo Luciano. "Material Symmetries in Homogenized Hexagonal-Shaped Composites as Cosserat Continua." Symmetry 12, no. 3 (2020): 441. http://dx.doi.org/10.3390/sym12030441.

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In this work, material symmetries in homogenized composites are analyzed. Composite materials are described as materials made of rigid particles and elastic interfaces. Rigid particles of arbitrary hexagonal shape are considered and their geometry described by a limited set of parameters. The purpose of this study is to analyze different geometrical configurations of the assemblies corresponding to various material symmetries such as orthotetragonal, auxetic and chiral. The problem is investigated through a homogenization technique which is able to carry out constitutive parameters using a pri

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Xu, Yao-Chang, Andrew L. Roughton, Raymond Plante, Solo Goldstein, and Pierre Deslongchamps. "Stereocontrolled construction of 1,7-dimethyl A.B.C.[6.6.6] tricycles. Part I. Transannular Diels–Alder reactions of 14-membered macrocycles containing trans-dienophiles." Canadian Journal of Chemistry 71, no. 8 (1993): 1152–68. http://dx.doi.org/10.1139/v93-152.

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Transannular Diels–Alder reactions of 14-membered macrocyclic trienes possessing a methyl substituent on both the diene and dienophile moiety have been investigated. Macrocyclic structures 1a, 1b, and 1c having cis-trans-trans (CTT), trans-cis-trans (TCT), and trans-trans-trans (TTT) geometries could be stereoselectively constructed by coupling appropriately functionalized dienes 5 and dienophile 4 following an intramolecular displacement of an allylic halide by the anion of an appropriately located dimethyl malonate unit. The transannular Diels–Alder reaction performed on 1a led to a mixture

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