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Готові списки джерел за темами / Discotic molecules / Статті в журналах

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Статті в журналах з теми "Discotic molecules"

Автор: Grafiati

Опубліковано: 26 жовтня 2024

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1

Zhu, Lei, Ying Wang, Wenguang Wang, Xianyao Wu, and Ti Wu. "Synthesis and research of a kind of perylene imide discoid molecule." Journal of Physics: Conference Series 2226, no. 1 (March 1, 2022): 012007. http://dx.doi.org/10.1088/1742-6596/2226/1/012007.

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Abstract Discotic liquid crystal molecules are excellent organic semiconductor materials due to their high carrier mobility. Dibenzocoronene derivatives obtained by nuclear expansion with perylene diimide as a matrix are one of the discotic molecules. The key factor for the application of this type of molecule is that it can form stable and long-range ordered organic nano-scale thin films. It can be used as an efficient carrier transport channel. This paper intends to use the “channel effect” to obtain the corresponding long-range orderly ideal film. The “channeling effect” referred to in this article is to bond functional discoid molecules on the substrate firstly, than generate the corresponding self-assembled monomolecular membranes (SAMs) to form an ordered channel on the surface which strongly induces and restricts the discoid molecules that arranged in parallel and orderly with each other along the “channels” created on the surface of the SAMs. Perylene diimide derivatives are a kind of good electron transport materials, which are characterized by high carrier mobility, low processing cost, and good thermal stability. However, it has the large rigid core and the melting point is relatively high. In this paper, a monobenzocoperylene diimide derivative is designed and synthesized, which will have a strong effect on the surface of the silicon substrate, and reduce the molecular melting point by reducing the size of the perylene imide discotic molecular core expansion.

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2

Jing, Tammy. "Alkynyl-Containing Discotic Liquid Crystal Molecules." Science Insights 41, no. 3 (August 28, 2022): 619–24. http://dx.doi.org/10.15354/si.22.re075.

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Under specific circumstances, organized columnar phases can be formed from the planar discoid shapes of the molecules that make up discotic liquid crystals. These materials offer unusual features because of their distinct columnar phase structure. They are utilized in organic semiconductors, liquid crystal magnetic materials, and photoelectric conversion. It has numerous applications, so researchers are paying more and more attention to it. In this paper, the effects of alkynyl groups on the properties of discotic liquid crystals at various positions are emphatically discussed. The main focus is on the alkynyl-containing discotic liquid crystal molecules and their properties reported in domestic and foreign literature in the past ten years.

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3

Mi, Yong Sheng, Zhou Yang, Dong Wang, Peng Xia Liang, and Zhao Kui Jin. "Self-Assembly Micro-Nanostructures of Discotic Organic Molecules." Applied Mechanics and Materials 331 (July 2013): 567–71. http://dx.doi.org/10.4028/www.scientific.net/amm.331.567.

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A series of discotic organic molecules with different substituents have been successfully synthesized. The structures of these compounds were fully characterized by 1H-NMR, FT-IR and MS. Their optical and electrical properties were investigated by means of Uv-vis absorption, fluorescence emission and cyclic voltammogram. By exploring the self-assembly behavior of different substituted discotic molecules through method of solvent exchange-evaporation, organic micro-nanostructures such as nanoparticles, nanotubes and nanorods were obtained through supramolecular self-assembly. In order to investigate the applications of these discotic organic molecules, the relationship of molecular design, structural design and material properties has been studied based on the experimental work.

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4

Joshi, Ashutosh, V. Manjuladevi, Raj Kumar Gupta, and Sandeep Kumar. "Nanoribbons of discotic liquid crystal molecules." Materials Today: Proceedings 46 (2021): 5866–69. http://dx.doi.org/10.1016/j.matpr.2021.02.736.

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5

Hesse, H. C., D. Lembke, L. Dössel, X. Feng, K. Müllen, and L. Schmidt-Mende. "Nanostructuring discotic molecules on ITO support." Nanotechnology 22, no. 5 (December 23, 2010): 055303. http://dx.doi.org/10.1088/0957-4484/22/5/055303.

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6

Perea, Eva, Francisco López-Calahorra, Dolores Velasco, and Heino Finkelmann. "Polysubstituted N-Arylcarbazoles as Discotic Molecules." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 365, no. 1 (July 1, 2001): 695–702. http://dx.doi.org/10.1080/10587250108025348.

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7

Mishra, Mirtunjai, Bhavna Pal, Asmita Shah, Dharmendra Pratap Singh, Devendra Singh, and Devesh Kumar. "Theoretical prediction (DFT) and experimental observation of electronic and electro-optical properties of HATn (n = 5,6,7,8) molecules for optoelectronic applications." Physica Scripta 99, no. 4 (March 11, 2024): 045921. http://dx.doi.org/10.1088/1402-4896/ad2e5d.

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Abstract The formation of triphenylene core-based discotic mesogens exhibiting a classical columnar phase led to several superior electronic and optoelectronic applications. The present work reports the theoretical investigation of discotic hexaalkoxytriphenylene (HATn; n = 5, 6, 7, 8) mesogens including electro-optical, electronic, and thermodynamic properties using density functional theory (DFT) as a computational quantum mechanical tool. The various physical and chemical properties of these mesogens, such as electronegativity, specific heat capacity, polarizability, absorption, and dipole moment are calculated computationally and discussed in the study. The simulation study reveals the variation in physical properties either follows the odd–even effect or changes monotonically for HATn series. Experiment has been performed for comparison with the theoretical results. The physical and chemical properties of these discotic mesogens change with alkyl chain length variation and explain the structure–property correlation in the molecules. The obtained results of the designed molecular structure held promising applications for optoelectronic devices based on discotic mesogens.

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8

Kohne, Bernd, Klaus Praefcke, Werner Stephan, and Peter Nürnberg. "Discotische Flüssigkristalle: Beziehung zwischen Molekülstruktur und discogenen Eigenschaften scheibenförmiger Verbindungen, nicht-flüssigkristalline Ester des myo-Inosits und des Mytilits [1,2]." Zeitschrift für Naturforschung B 40, no. 7 (July 1, 1985): 981–86. http://dx.doi.org/10.1515/znb-1985-0722.

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Abstract A modified synthesis of mytilitol and the synthesis of various esters of the cyclitols myo-inositol (la) and mytilitol (2a) is described. Because of steric reasons all these derivatives of the two naturally occuring compounds exhibit no discotic mesophases. For instance, in comparison to mesomorphous scyllitol hexaesters already the methyl group perpendicular to the molecular core in the analogous hexaesters 2b-d of mytilitol suppresses discotic liquid crystalline character totally. This effect is discussed in connection to the relationship of mesomorphism with chemical structure of disc-shaped molecules.

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9

Savintseva, Liana, Alexander Avdoshin, Stanislav Ignatov, and Alexander Novikov. "Theoretical Study of Charge Mobility in Crystal Porphine and a Computer Design of a Porphine-Based Semiconductive Discotic Liquid Mesophase." International Journal of Molecular Sciences 24, no. 1 (January 1, 2023): 736. http://dx.doi.org/10.3390/ijms24010736.

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Organic semiconductors are the focus of numerous studies; they are used in electronic devices. Modern research involves the production of neuromorphic organic materials, including those based on liquid crystal materials. The purpose of this work involves the theoretical modeling of molecules (the “core with branches” type) to construct a discotic mesophase capable of performing the functions of a neuromorphic material. For this purpose, the conductivity of crystal porphine, which can act as the nucleus of a molecule of the “core with branches” type, was investigated. The Marcus theory charge mobility values for the hole and electron were 0.148 and 0.088 cm2/V·s, respectively (the MOO method for calculating transfer integrals), and 0.561 and 0.160 cm2/V·s (DIPRO method). Based on TD-HF (HF-3c level of theory) calculations, possible structures of molecules for the formation of a discotic mesophase are proposed.

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10

Zarragoicoechea, G. J., D. Levesque, and J. J. Weis. "Monte Carlo simulations of polar discotic molecules." Molecular Physics 78, no. 6 (April 20, 1993): 1475–92. http://dx.doi.org/10.1080/00268979300100971.

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11

Yamamoto, Yohei. "Electroactive Nanotubes from π-Conjugated Discotic Molecules". Bulletin of the Chemical Society of Japan 84, № 1 (15 січня 2011): 17–25. http://dx.doi.org/10.1246/bcsj.20100272.

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12

MACDONALD, R., P. MEINDL, and S. BUSCH. "THE PHOTOELECTRICAL REORIENTATION EFFECT IN NEMATIC LIQUID CRYSTALS." Journal of Nonlinear Optical Physics & Materials 08, no. 03 (September 1999): 379–88. http://dx.doi.org/10.1142/s0218863599000266.

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A new photoelectrical reorientation effect in nematic liquid crystals has been investigated. The effect occurs under the combined application of DC electrical fields and low power illumination. It leads to very sensitive Kerr-like optical nonlinearties which can be characterized by rather large coefficients up to 6 cm2/W. So far, it was observed in nematic liquid crystals of discotic molecules but recently also with certain calamitic, i.e., rod-like molecules. A comparison of results obtained with discotic and calamitic mesogens will be given and a first model of the effect is discussed.

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13

Saha, Jayashree, D. Ghose, and M. Saha. "Molecular Mean Field Study on Even–Odd Effect in Discotic Liquid Crystals." International Journal of Modern Physics B 11, no. 20 (August 10, 1997): 2433–41. http://dx.doi.org/10.1142/s0217979297001246.

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The mean field model for rectangular lattice having herring-bone packing of tilted molecules has been extended to reproduce even–odd alternation in the transition temperatures in a discotic system by taking into account the specific change in layering interaction and molecular biaxiality for each member of a homologous series.

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14

Vela, Sonia, José Augusto Berrocal, Carmen Atienza, E. W. Meijer, and Nazario Martín. "Mesoscopic helical architectures via self-assembly of porphyrin-based discotic systems." Chemical Communications 53, no. 29 (2017): 4084–87. http://dx.doi.org/10.1039/c7cc01670k.

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15

Termine, Roberto, and Attilio Golemme. "Charge Mobility in Discotic Liquid Crystals." International Journal of Molecular Sciences 22, no. 2 (January 16, 2021): 877. http://dx.doi.org/10.3390/ijms22020877.

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Анотація:

Discotic (disk-shaped) molecules or molecular aggregates may form, within a certain temperature range, partially ordered phases, known as discotic liquid crystals, which have been extensively studied in the recent past. On the one hand, this interest was prompted by the fact that they represent models for testing energy and charge transport theories in organic materials. However, their long-range self-assembling properties, potential low cost, ease of processability with a variety of solvents and the relative ease of tailoring their properties via chemical synthesis, drove the attention of researchers also towards the exploitation of their semiconducting properties in organic electronic devices. This review covers recent research on the charge transport properties of discotic mesophases, starting with an introduction to their phase structure, followed by an overview of the models used to describe charge mobility in organic substances in general and in these systems in particular, and by the description of the techniques most commonly used to measure their charge mobility. The reader already familiar or not interested in such details can easily skip these sections and refer to the core section of this work, focusing on the most recent and significant results regarding charge mobility in discotic liquid crystals.

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16

Zhang, Zhi, Yao Wang, Qun Chen, and Zhipan Zeng. "Performance Enhancement of Interdigitated Heterojunction Solar Cells with Discotic Molecule." Energies 15, no. 15 (August 7, 2022): 5736. http://dx.doi.org/10.3390/en15155736.

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Ordered interdigitated heterojunction as a promising nanostructure has attracted considerable attention due to its potential application in solar cells. However, a suitable construction to achieve effective free carrier transport in these nanostructures remains a challenge. In this study, interdigitated nanostructure was fabricated by combining vertically orientated TiO2 nanotube array with discotic liquid crystal Copper (II) 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine (tbCuPc). These discotic molecules were assembled as homeotropic alignment in the interdigitated nanostructure, which enhanced the carrier mobility of active layer considerably. The performance of photovoltaic cells with this interdigitated heterojunction was improved. Molecule orientation leading to charge carrier mobility enhancement was found to play a key role in improving the power conversion efficiency of the devices substantially.

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17

Caprion, D. "Discotic molecules in cylindrical nanopores: A Monte Carlo study." European Physical Journal E 28, no. 3 (February 3, 2009): 305–13. http://dx.doi.org/10.1140/epje/i2008-10412-6.

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18

Kadam, Jitendra, Charl F. J. Faul, and Ulli Scherf. "Induced Liquid Crystallinity in Switchable Side-Chain Discotic Molecules." Chemistry of Materials 16, no. 20 (October 2004): 3867–71. http://dx.doi.org/10.1021/cm049791k.

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19

Perova, T. S., P. C. Fannin, and P. A. Perov. "Reorientation of Molecules in Magnetically Doped Discotic Liquid Crystal." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 352, no. 1 (November 2000): 141–48. http://dx.doi.org/10.1080/10587250008023171.

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20

Yamamoto, Yohei. "ChemInform Abstract: Electroactive Nanotubes from π-Conjugated Discotic Molecules". ChemInform 42, № 17 (31 березня 2011): no. http://dx.doi.org/10.1002/chin.201117224.

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21

Vera, Alejandra, Hernán Ahumada, Victor Bahamonde, Rodrigo Montecinos, Ramiro Araya-Maturana, Daniel Muñoz, and Boris E. Weiss-López. "Dynamics and Orientation of Parathion Dissolved in a Discotic Nematic Lyomesophase." Australian Journal of Chemistry 61, no. 12 (2008): 968. http://dx.doi.org/10.1071/ch08209.

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Parathion, an organophosphorous pesticide, presents serious hazards to the environment and health. It inhibits acetylcholinesterase, an enzyme incorporated in the cell membrane. A study on the behaviour of parathion in a lipid environment is interesting from environmental cleaning and biological perspectives. 2H NMR quadrupole splittings (ΔνQ) and longitudinal relaxation times (T1) of parathion-d4, dissolved in a nematic discotic lyomesophase made of tetradecyltrimethylammonium chloride/decanol (10% 1,1-dideuterodecanol)/water (0.1% D2O)/NaCl, have been measured. ΔνQ and T1 from DHO and 1,1-dideuterodecanol were also obtained. For a detailed understanding of the experimental results, a 19 ns molecular dynamics (MD) simulation of a bilayer fragment including three parathion molecules was calculated. Parathion is strongly attached to the aggregate and the solubilization increases the alignment of the interface components. Calculated densities show that parathion is located in the hydrophobic core, near the interface, and experiences an electrostatic interaction with the ammonium headgroups. On average, the molecule orients with the ring plane containing the bilayer normal.

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22

Mi, Yongsheng, Pengxia Liang, Zhou Yang, Dong Wang, Wanli He, Hui Cao, and Huai Yang. "Synthesis and co-assembly of gold nanoparticles functionalized by a pyrene–thiol derivative." RSC Advances 5, no. 1 (2015): 140–45. http://dx.doi.org/10.1039/c4ra11932k.

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We synthesized a series of gold nanoparticles capped with 11-(4-(pyren-1-yl)phenoxy)undecane-1-thiol and with 1-dodecanethiol. The homodispersed gold nanoparticles were fully verified and co-assembly of gold nanoparticles composited with discotic molecules were investigated.

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23

Zhang, Chun Xiu, Zhi Qun He, Jia Ling Pu, Jun Jie Wang, Yong Sheng Wang, Zhong Xiao Li, and Shi Ye. "The Synthesis and Phase Behavior of a Novel Discoticnematic Triphenylene Mesogen and its Application to an Optically Anisotropic Film." Key Engineering Materials 373-374 (March 2008): 678–81. http://dx.doi.org/10.4028/www.scientific.net/kem.373-374.678.

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A novel discotic triphenylene derivative bearing one triphenylene discogen as core and three cyano-biphenyl moieties was synthesized and its thermal behavior was studied using polarizing optical microscope, differential scanning calorimeter and X-ray diffraction. It was found that this molecule containing [decylene?] spacers showed nematic phase. After being mixed with methyl methacrylate (MMA), the discogen showed nematic phase at the mesophase temperature range (64~85 °C) and oriented spontaneously in the mixture after annealing for 2 hours in the mixture. The orientation can be stabilized by the polymerization of MMA. The orientation can be fixed by the polymerization of MMA. It was treated directly on glass substrate, which surface did not treat by polyimide film and confirmed the orientation was proved by X-ray diffraction. This offers If the alignment of the discotic molecules can be freely controlled and fixed, a useful mean to produce new area of optically anisotropic film will be produced with this material.

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24

Sakurai, Tsuneaki, Kenichi Kato, and Masaki Shimizu. "Side-Chain Labeling Strategy for Forming Self-Sorted Columnar Liquid Crystals from Binary Discotic Systems." Crystals 13, no. 10 (October 10, 2023): 1473. http://dx.doi.org/10.3390/cryst13101473.

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The spontaneous formation of self-sorted columnar structures of electron-donating and accepting π-conjugated molecules is attractive for photoconducting and photovoltaic properties. However, the simple mixing of donor–acceptor discotic molecules usually results in the formation of mixed-stacked or alternating-stacked columns. As a new strategy for overcoming this problem, here, we report the “side-chain labeling” approach using binary discotic systems and realize the preferential formation of such self-sorted columnar structures in a thermodynamically stable phase. The demonstrated key strategy involves the use of hydrophobic and hydrophilic side chains. The prepared blend is composed of liquid crystalline phthalocyanine with branched alkyl chains (H2Pc) and perylenediimide (PDI) carrying alkyl chains at one side and triethyleneglycol (TEG) chains at the other side (PDIC12/TEG). To avoid the thermodynamically unfavorable contact among hydrophobic and hydrophilic chains, PDIC12/TEG self-assembles to stack up on top of each other and H2Pc as well, forming a homo-stacked pair of columns (self-sort). Importantly, H2Pc and PDIC12/TEG in the blend are macroscopically miscible and uniform, and mesoscopically segregated. The columnar liquid crystalline microdomains of H2Pc and PDIC12/TEG are homeotropically aligned in a glass sandwiched cell. The “labeling” strategy demonstrated here is potentially applicable to any binary discotic system and enables the preferential formation of self-sorted columnar structures.

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25

Baalss, D., and S. Hess. "The Viscosity Coefficients of Oriented Nematic and Nematic Discotic Liquid Crystals; Affine Transformation Model." Zeitschrift für Naturforschung A 43, no. 7 (July 1, 1988): 662–70. http://dx.doi.org/10.1515/zna-1988-0709.

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Abstract General expressions are derived for the anisotropy of the viscosity and for the Leslie coefficients governing the flow alignment subject to the assumption that the equipotential surfaces for the interaction of oriented nonspherical molecules in the nematic or nematic discotic phase of a liquid crystal are related to a spherical interaction potential by an affine transformation. In particular, for uniaxial particles, the seven independent viscosity coefficients of a nematic are given in terms of the two viscosity coefficients of a reference fluid of spherical particles and the axes ratio of the nonspherical molecules. The theory is compared with results from nonequilibrium molecular dynamics computer simulations and with experimental data.

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26

Fu, Shu Fang, Jing Bai, Qiang Zhang, and Xiu Rong Qu. "Effect of Magnetic Field on Molecular Orientation of Disklike Nematic Liquid Crystalline Polymer." Materials Science Forum 663-665 (November 2010): 767–70. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.767.

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The effect of magnetic field on the flow-phase diagram of discotic nematic liquid crystalline polymers (LCPs) is analyzed with the extended Doi theory in which the molecular shape parameter is defined at negative one. The evolution equation for the probability function of the LCP molecules is solved without any closure approximations. The transition among flow-orientation modes, such as tumbling, wagging and aligning defined similar to the rodlike LCPs, are strongly affected by the magnetic fields parallel to the flow direction.

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27

Foster, E. Johan, Christine Lavigueur, Ying-Chieh Ke, and Vance E. Williams. "Self-assembly of hydrogen-bonded molecules: discotic and elliptical mesogens." Journal of Materials Chemistry 15, no. 37 (2005): 4062. http://dx.doi.org/10.1039/b503310a.

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28

Emelyanenko, Alexander V., and Sergey A. Shvetsov. "Discotic Nematic State in a System of Rod-Like Molecules." Liquid Crystals and their Application 23, no. 1 (March 30, 2023): 78–89. http://dx.doi.org/10.18083/lcappl.2023.1.78.

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29

Kearley, G. J., F. M. Mulder, S. J. Picken, P. H. J. Kouwer, and J. Stride. "Dynamics of discotic methoxy triphenylene molecules from quasielastic neutron scattering and molecular dynamics simulations." Chemical Physics 292, no. 2-3 (August 2003): 185–90. http://dx.doi.org/10.1016/s0301-0104(03)00083-1.

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30

van der Schoot, Paul, M. A. J. Michels, Luc Brunsveld, Rint P. Sijbesma, and Aïssa Ramzi. "Helical Transition and Growth of Supramolecular Assemblies of Chiral Discotic Molecules." Langmuir 16, no. 26 (December 2000): 10076–83. http://dx.doi.org/10.1021/la000794v.

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31

Vaca Chávez, Fabián, Pedro J. Sebastião, Yasuo Miyake, Hirosato Monobe, and Yo Shimizu. "Dynamics of Discotic Fluoroalkylated Triphenylene Molecules Studied by Proton NMR Relaxometry." Journal of Physical Chemistry B 116, no. 8 (February 22, 2012): 2339–46. http://dx.doi.org/10.1021/jp206225t.

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32

Neuling, H. W., H. Stegemeyer, K. Praefcke, and B. Kohne. "X-Ray Diffraction Studies on Alicyclic Saturated Discotic Liquid Crystals." Zeitschrift für Naturforschung A 42, no. 6 (June 1, 1987): 631–35. http://dx.doi.org/10.1515/zna-1987-0619.

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Анотація:

The discotic liquid crystalline phase of a new class of disc-like molecules (hexa-O-alkanoylscyllo- inositoles) is studied by small angle X-ray scattering, DSC and optical observations. Comparison of these three methods allows the determination of the structural arrangement. X-ray film exposures of oriented samples clearly demonstrate the hexagonal columnar ordered type of mesophases. A simple model calculation shows that the alkyl chains of neighbouring columns interpenetrate each other to a small extent.

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33

Gupta, Raj Kumar, V. Manjuladevi, C. Karthik, and Sandeep Kumar. "Studies on ultrathin films of tricycloquinazoline (TCQ) based discotic liquid crystal molecules." Journal of Physics: Conference Series 417 (March 1, 2013): 012068. http://dx.doi.org/10.1088/1742-6596/417/1/012068.

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34

Yang, X., S. A. Nitzsche, Shaw Ling Hsu, D. Collard, R. Thakur, C. P. Lillya, and H. D. Stidham. "Spectroscopic analysis of discotic liquid-crystalline molecules and polymers on external surfaces." Macromolecules 22, no. 6 (November 1989): 2611–17. http://dx.doi.org/10.1021/ma00196a012.

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35

Coussaert, Tamara, and Marc Baus. "Density-functional theory of the columnar phase of discotic Gay–Berne molecules." Journal of Chemical Physics 116, no. 17 (May 2002): 7744–51. http://dx.doi.org/10.1063/1.1467340.

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36

Rondelez, F., J. F. Baret, and A. G. Bois. "Liquid expanded-liquid condensed phase transition in Langmuir films of discotic molecules." Journal de Physique 48, no. 7 (1987): 1225–34. http://dx.doi.org/10.1051/jphys:019870048070122500.

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37

De Luca, Giovanna, Andrea Liscio, Fabian Nolde, Luigi Monsù Scolaro, Vincenzo Palermo, Klaus Müllen, and Paolo Samorì. "Self-assembly of discotic molecules into mesoscopic crystals by solvent-vapour annealing." Soft Matter 4, no. 10 (2008): 2064. http://dx.doi.org/10.1039/b807391k.

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38

Petkau-Milroy, Katja, and Luc Brunsveld. "Self-Assembling Multivalency - Supramolecular Polymers Assembled from Monovalent Mannose-Labelled Discotic Molecules." European Journal of Organic Chemistry 2013, no. 17 (April 4, 2013): 3470–76. http://dx.doi.org/10.1002/ejoc.201300057.

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39

Ciobanu, Catalina Ionica, Iulian Berladean, Elena-Luiza Epure, Aurel Simion, Gabriela Lisa, Yahia Boussoualem, and Irina Carlescu. "Mesomorphic and Thermal Behavior of Symmetric Bent-Core Liquid Crystal Compounds Derived from Resorcinol and Isophthalic Acid." Crystals 11, no. 10 (October 8, 2021): 1215. http://dx.doi.org/10.3390/cryst11101215.

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Bent-core liquid crystals (BCLC) have been widely studied as a result of their unusual polar and chiral properties. Similar to calamitic and discotic molecules, BCLC molecules also exhibit nematic phases, besides other higher order mesophases. The aim of this work is to comparatively analyze the mesomorphic behavior of some bent-core 1,3-disubstituted benzene core compounds derived from resorcinol and isophthalic acid. Thus, the two classes of compounds differ in the nature of the orientation of the ester bond between the benzene central core and the two branches attached to the core. The mesomorphic behavior was elucidated by polarized light optical microscopy and differential calorimetry. Given the relatively high isotropic points of the compounds, confirmation of the thermal stability in the domains manifesting liquid crystalline properties was performed by thermogravimetric studies. The theoretical explanation of the difference in mesomorphic behavior for the two classes was based on molecular modeling studies.

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40

Krause, Christina, Reiner Zorn, Bernhard Frick, and Andreas Schönhals. "Quasi- and inelastic neutron scattering to investigate the molecular dynamics of discotic molecules in the bulk." EPJ Web of Conferences 83 (2015): 02017. http://dx.doi.org/10.1051/epjconf/20158302017.

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41

Ślęczkowski, Piotr. "Spectroscopic and Spectroelectrochemical Studies of Hexapentyloxytriphenylene—A Model Discotic Molecule." International Journal of Molecular Sciences 24, no. 8 (April 8, 2023): 6924. http://dx.doi.org/10.3390/ijms24086924.

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The electrochemical and spectroelectrochemical properties of the discotic mesogen 2,3,6,7,10,11-pentyloxytriphenylene (H5T) were studied with the use of cyclic voltammetry combined with UV-Vis and electron paramagnetic resonance (EPR) spectroscopy in solution. The UV-Vis absorption spectroscopy of H5T in dichloromethane showed its monomeric state in a concentration range up to 10−3 mol dm−3. The reversible process of the electrochemical formation of the radical cation was evidenced within the experimentally accessible potential window. The in situ UV-Vis spectroelectrochemical measurements further enabled identification of the product of the redox process and evaluation of the effect of aggregation in the concentration range of 5 × 10−3 mol dm−3. The results are discussed in the frame of solvent effects on the self-assembly propensity of solute molecules, in a wide range of concentrations. In particular, the crucial role of the solvent polarity is indicated, which contributes to the understanding of solution effects and pre-programming of supramolecular organic materials, in particular anisotropic disc-shaped hexa-substituted triphenylenes.

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42

Henderson, P., H. Ringsdorf, and P. Schuhmacher. "Synthesis of functionalized triphenylenes and dibenzopyrenes Precursor molecules for polymeric discotic liquid crystals." Liquid Crystals 18, no. 2 (February 1995): 191–95. http://dx.doi.org/10.1080/02678299508036613.

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43

Karthik, C., V. Manjuladevi, R. K. Gupta, and Sandeep Kumar. "Pattern formation in Langmuir–Blodgett films of tricycloquinazoline based discotic liquid crystal molecules." Journal of Molecular Structure 1070 (July 2014): 52–57. http://dx.doi.org/10.1016/j.molstruc.2014.04.036.

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44

van Gestel, Jeroen, and Paul van der Schoot. "Impact of Steric Interactions on the Helical Transition in Assemblies of Discotic Molecules." Langmuir 22, no. 1 (January 2006): 446–52. http://dx.doi.org/10.1021/la0521903.

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45

Geng, Yanfang, Shaoqing Chang, Keqing Zhao, Qingdao Zeng, and Chen Wang. "Self-Assembly of Four-Claw Discotic Mesogenic Molecules: Influence of Core on Chirality." Journal of Physical Chemistry C 119, no. 32 (July 30, 2015): 18216–20. http://dx.doi.org/10.1021/acs.jpcc.5b03878.

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46

Tsukruk, Vladimir V., Holger Bengs, and Helmut Ringsdorf. "Discotic Twin and Triple Molecules with Charge-Transfer Interactions in Langmuir−Blodgett Films." Langmuir 12, no. 3 (January 1996): 754–57. http://dx.doi.org/10.1021/la9506133.

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47

Cruz, C., P. J. Sebastião, J. Figueirinhas, A. C. Ribeiro, H. T. Nguyen, C. Destrade, and F. Noack. "NMR Study of Molecular Dynamics in a D ho Columnar Mesophase." Zeitschrift für Naturforschung A 53, no. 10-11 (November 1, 1998): 823–27. http://dx.doi.org/10.1515/zna-1998-10-1104.

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Abstract In this paper we report the first molecular dynamics study combining fast field-cycling and conven-tional NMR techniques in a thermotropic liquid crystal of discotic molecules exhibiting an ordered columnar hexagonal mesophase. Using the association of these techniques we obtained proton T1 data over a very large domain of Larmor frequencies (ω/2π from 500 Hz to 85 MHz). The proton spin-lattice relaxation results were analysed considering the structure of the mesophase and the types of movements which are expected to influence significantly the relaxation rate, namely local molecu-lar rotational reorientations, inter-columnar self-diffusion and collective movements corresponding to bending and compression of the columns. We verified that these mechanisms dominate the relaxation respectively for high, medium and low Larmor frequencies.

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48

Ghose, D., T. R. Bose, J. Saha, C. D. Mukherjee, M. K. Roy, and M. Saha. "A Molecular Meanfield Model for the Biaxial Rectangular Discotic Phase with Herring-Bone Packing of Tilted Molecules." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 264, no. 1 (May 1995): 165–79. http://dx.doi.org/10.1080/10587259508037310.

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49

Wang, Ying, Wen Guang Wang, Rui Cheng, and Jia Ling Pu. "Synthesis and Properties of Functionalized Sulfur-Containing Hexa-Peri-Hexabenzocoronene." Advanced Materials Research 1088 (February 2015): 290–94. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.290.

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Synthesis and characterization of a novel hexabenzocoronene (HBC) derivative attached with four alkyl swallow-tailed chains and two sulfur-containing chains are described. The designed peripheral decoration with dove tails as solubilizer and sulfur-containing groups as functionalizer is expected to improve the solubility of molecules, change the columnar spacing stacks and make for its orientation on matrix surface. Its UV−vis absorption spectra appeared in 350-400 nm region as same as typical that of this kind of compounds. The thermal properties as discotic liquid crystal and its orientation on matrix are being studied.

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50

Bilgin-Eran, Belkız, Carsten Tschierske, Siegmar Diele, and Ute Baumeister. "Fluoroalkylated mononuclear ortho-metallated mesogens: new molecules at the calamitic–discotic cross-over point." J. Mater. Chem. 16, no. 12 (2006): 1145–53. http://dx.doi.org/10.1039/b511832h.

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