1
|
Nematogenic Laterally Substituted Supramolecular H-Bonded Complexes Based on Flexible Core. CRYSTALS 2020. [DOI: 10.3390/cryst10100878] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
New laterally CH3-substituted series of 1:2 hydrogen-bonded supramolecular complexes (HBSMCs) based on flexible acid core were prepared and mesomorphically investigated. Mixtures were formed through H-bonded interactions between adipic acid (A) and 4-(2-(pyridin-4-yl)diazenyl-(3-methylphenyl) 4-alkoxybenzoate (Bn). Mesomorphic and optical properties were investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), X-ray diffraction (XRD), and UV-spectroscopy. HBSMCs formed from 1:2 mol mixture of A:2Bn, where the base component (B) bearing different alkoxy chain lengths from n = 8 to 14. The new HBSMCs (A/2B) interactions were confirmed by Fermi-bands formation via FT-IR spectroscopy measurements. Results revealed that all prepared HBSMCs are enantiotropic, exhibiting induced nematic (N) phase. The XRD pattern confirmed the POM texture results. Moreover, a comparison was made between the new laterally HBSMC series based on flexible core and the previously analyzed laterally neat complexes.
Collapse
|
2
|
Phase Behavior and DFT Calculations of Laterally Methyl Supramolecular Hydrogen-Bonding Complexes. CRYSTALS 2019. [DOI: 10.3390/cryst9030133] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Four new series of laterally methyl-substituted hydrogen-bonded supramolecular complexes were prepared. The prepared complexes were thermally investigated by differential scanning calorimetry (DSC) and phases identified by polarized light microscopy (PLM). Supramolecular hydrogen-bonded complexes formed from a 1:1 mixture of any two derivatives, bearing different alkoxy chains, of 4-alkoxyphenylazobenzoic acid and 4-(2-(pyridin-4-yl)diazenyl-(2-(or 3-)methylphenyl) 4-alkoxybenzoate. The investigated 1:1 mixture made by introducing a lateral methyl group by different spatial orientation angles into pyridine-based components. All new complexes were confirmed by Fourier-transform infrared spectroscopy (FTIR) and computational calculations used to study their stabilities. It is found that the prepared complexes are dimorphic, exhibiting smectic C and enhanced nematic phases. A comparison was made between the new series and previously investigated simpler complexes, revealed that the incorporation of the phenylazo group elongate the mesogenic part and hence broad nematic phases were obtained with high stability.
Collapse
|
3
|
Sıdır YG, Sıdır İ, Demiray F. Dipole moment and solvatochromism of benzoic acid liquid crystals: Tuning the dipole moment and molecular orbital energies by substituted Au under external electric field. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.02.055] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
Goossens K, Lava K, Bielawski CW, Binnemans K. Ionic Liquid Crystals: Versatile Materials. Chem Rev 2016; 116:4643-807. [PMID: 27088310 DOI: 10.1021/cr400334b] [Citation(s) in RCA: 411] [Impact Index Per Article: 51.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
This Review covers the recent developments (2005-2015) in the design, synthesis, characterization, and application of thermotropic ionic liquid crystals. It was designed to give a comprehensive overview of the "state-of-the-art" in the field. The discussion is focused on low molar mass and dendrimeric thermotropic ionic mesogens, as well as selected metal-containing compounds (metallomesogens), but some references to polymeric and/or lyotropic ionic liquid crystals and particularly to ionic liquids will also be provided. Although zwitterionic and mesoionic mesogens are also treated to some extent, emphasis will be directed toward liquid-crystalline materials consisting of organic cations and organic/inorganic anions that are not covalently bound but interact via electrostatic and other noncovalent interactions.
Collapse
Affiliation(s)
- Karel Goossens
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 689-798, Republic of Korea.,Department of Chemistry, KU Leuven , Celestijnenlaan 200F, P.O. Box 2404, B-3001 Heverlee, Belgium
| | - Kathleen Lava
- Department of Chemistry, KU Leuven , Celestijnenlaan 200F, P.O. Box 2404, B-3001 Heverlee, Belgium.,Department of Organic and Macromolecular Chemistry, Ghent University , Krijgslaan 281 S4, B-9000 Ghent, Belgium
| | - Christopher W Bielawski
- Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 689-798, Republic of Korea.,Department of Chemistry and Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 689-798, Republic of Korea
| | - Koen Binnemans
- Department of Chemistry, KU Leuven , Celestijnenlaan 200F, P.O. Box 2404, B-3001 Heverlee, Belgium
| |
Collapse
|
5
|
Sıdır YG, Sıdır İ. Solvatochromic fluorescence of 4-alkoxybenzoic acid liquid crystals: Ground and excited state dipole moments of monomer and dimer structures determined by solvatochromic shift methods. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.07.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Subhapriya P, Sadasivam K, Madhu Mohan MLN, Vijayanand PS. Experimental and theoretical investigation of p-n alkoxy benzoic acid based liquid crystals - a DFT approach. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 123:511-523. [PMID: 24508159 DOI: 10.1016/j.saa.2014.01.074] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 01/05/2014] [Accepted: 01/10/2014] [Indexed: 06/03/2023]
Abstract
In the present study structural effects of alkoxy chain lengths and mesogen properties of hydrogen bonded (nOBASA) complexes (n=5, 6, 7) have been studied by density functional theory (DFT) calculations and Fourier Transform Infrared (FT-IR) spectrum. The B3LYP/6-311G(d,p) level of theory has been adopted for all the computations. The experimental FT-IR (400-4000cm(-1)) spectrum was recorded on the solid phase of the molecule. The intermolecular hydrogen bond formation has been conformed from the optimized geometry. The vibrational assignments, highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies were calculated. The stability of molecule arising from hyper-conjugative interactions and charge delocalization were analyzed using natural bond orbital (NBO) analysis. The electron density (ED) in the σ(*) and π(*) anti-bonding orbital and second order delocalization energies confirmed the occurrence of intermolecular charge transfer. The energetic behavior of the title compounds in solvent phase is examined using the B3LYP/6-311G(d,p) method by applying the Onsager and polarizable continuum model. The molecular electrostatic potential (MEP) surface was generated over the optimized geometry of the molecule to obtain the chemical reactivity of the molecule. The charge distribution of the mesogen molecules has been calculated. The reliability of the methods used has been assessed by comparing the theoretical results obtained from the experimental findings. Moreover, the mesomorphic behavior and the nematic phase stabilities for each molecule have been predicted using calculated local charge distribution. The simulated FT-IR spectrum of 5OBASA was agreed with experimentally observed spectrum.
Collapse
Affiliation(s)
- P Subhapriya
- Department of Physical sciences, Bannari Amman Institute of Technology (Autonomous), Sathyamangalam, Erode 638 401, Tamil Nadu, India
| | - K Sadasivam
- Department of Physical sciences, Bannari Amman Institute of Technology (Autonomous), Sathyamangalam, Erode 638 401, Tamil Nadu, India
| | - M L N Madhu Mohan
- Liquid Crystal Research Laboratory (LCRL), Bannari Amman Institute of Technology, Sathyamangalam, Erode 638 401, Tamil Nadu, India
| | - P S Vijayanand
- Department of Physical sciences, Bannari Amman Institute of Technology (Autonomous), Sathyamangalam, Erode 638 401, Tamil Nadu, India.
| |
Collapse
|
7
|
|
8
|
Aver’yanov EM. The use of chebyshev polynomials orthogonal on a finite arbitrary system of points for interpolating changes in nematic-isotropic liquid phase transition temperatures in homologous series. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2006. [DOI: 10.1134/s0036024406130218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
9
|
Hoffmann F, Hartung H, Weissflog W, Jones PG, Chrapkowski A. Crystal and Molecular Structure of the Laterally Branched Nematogenic Compound 2-n-Nonyl-1,4-phenylene Bis (4-n-octyloxybenzoate). ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259508034548] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- F. Hoffmann
- a Martin-Luther-Universität Halle-Wittenberg, Institut für Physikalische Chemie , Mühlpforte 1, D-06108 , Halle , Germany
| | - H. Hartung
- a Martin-Luther-Universität Halle-Wittenberg, Institut für Physikalische Chemie , Mühlpforte 1, D-06108 , Halle , Germany
| | - W. Weissflog
- b Max-Planck-Gesellschaft, Arbeitsgruppe Flüssigkristalline Systeme , Mühlpforte 1, D-06108 , Halle , Germany
| | - P. G. Jones
- c Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie , Postfach 3329, D-38023 , Braunschweig , Germany
| | - A. Chrapkowski
- c Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie , Postfach 3329, D-38023 , Braunschweig , Germany
| |
Collapse
|
10
|
Zheng Y, Shen M, Lu M, Ren S. Liquid crystalline epoxides with long lateral substituents: Synthesis and curing. Eur Polym J 2006. [DOI: 10.1016/j.eurpolymj.2006.02.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
11
|
Pugh C, Shao J, Ge JJ, Cheng SZD. Correlation of Model Compounds and Laterally Attached Side-Chain Liquid-Crystalline Polynorbornenes with an 11-Carbon Spacer. Macromolecules 1998. [DOI: 10.1021/ma9715738] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Coleen Pugh
- Macromolecular Science and Engineering Center, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, and Department of Polymer Science, University of Akron, Akron, Ohio 44329-3909
| | - Jun Shao
- Macromolecular Science and Engineering Center, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, and Department of Polymer Science, University of Akron, Akron, Ohio 44329-3909
| | - Jason J. Ge
- Macromolecular Science and Engineering Center, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, and Department of Polymer Science, University of Akron, Akron, Ohio 44329-3909
| | - Stephen Z. D. Cheng
- Macromolecular Science and Engineering Center, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, and Department of Polymer Science, University of Akron, Akron, Ohio 44329-3909
| |
Collapse
|
12
|
Sadashiva BK, Prasad V. Mesomorphic properties of 1-(4′-dodecylbiphenyl-4-yl)-3-(2 or 3-alkoxyphenyl)propane-1,3-diones: the influence of alkoxy-substituent position. ACTA ACUST UNITED AC 1996. [DOI: 10.1039/p29960000755] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
13
|
|
14
|
|
15
|
|
16
|
Diele S, Roth K, Demus D. Thermotropic Liquid Crystalline Compounds with Lateral Long Chain Substituents (VII). X-Ray Studies in 1,4-Bis-(4-n-oetyloxybenzyoloxy)-2-n-alkylbenzenes. CRYSTAL RESEARCH AND TECHNOLOGY 1986. [DOI: 10.1002/crat.2170210123] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
17
|
Demus D, Hauser A, Isenberg A, Pohl M, Selbmann C, Weissflog W, Wieczorek S. Thermotropic liquid crystalline compounds with lateral long-chain substituents (III). Molar volumina, viscosities, optical refractive indices and order parameters of 1,4-Bis-[4-n-octyloxybenzoyloxy]-2-n-alkylbenzenes. CRYSTAL RESEARCH AND TECHNOLOGY 1985. [DOI: 10.1002/crat.2170201018] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|