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Anders C, Wagner M, Alaasar M, Fischer VM, Waldecker R, Zhao Y, Tan T, Cao Y, Liu F, Tschierske C. Highly branched bolapolyphilic liquid crystals with a cubic A15 network at the triangle-square transition. Chem Commun (Camb) 2024; 60:1023-1026. [PMID: 38173419 DOI: 10.1039/d3cc05247h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Rod-like bolapolyphiles with highly branched carbosilane-based side-chains self-assemble into several honeycomb structures if the oligo(p-phenylene ethynylene) core is polyfluorinated, whereas for the non-fluorinated series an A15 type cubic network of rod-bundles was observed instead, suggesting a brand new pathway for the transition between triangular and square honeycomb phases.
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Affiliation(s)
- Christian Anders
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, Halle 06120, Germany.
| | - Matthias Wagner
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, Halle 06120, Germany.
| | - Mohamed Alaasar
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, Halle 06120, Germany.
| | - Virginia-Marie Fischer
- Institute of Mathematics, Martin Luther University Halle-Wittenberg, Theodor-Lieser-Str. 5, Halle 06120, Germany
| | - Rebecca Waldecker
- Institute of Mathematics, Martin Luther University Halle-Wittenberg, Theodor-Lieser-Str. 5, Halle 06120, Germany
| | - Yangyang Zhao
- Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Tianyi Tan
- Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Yu Cao
- Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Feng Liu
- Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Carsten Tschierske
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, Halle 06120, Germany.
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Saeed A, Poppe M, Wagner MB, Hauche S, Anders C, Cao Y, Zhang L, Tschierske C, Liu F. The rhombic honeycomb - a new mode of self-assembly in liquid crystalline soft matter. Chem Commun (Camb) 2022; 58:7054-7057. [PMID: 35648051 DOI: 10.1039/d2cc01907h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rod-like liquid crystalline (LC) polyphilic compounds with a linear oligo(phenyleneethynylene) core, sticky glycerol groups at each end and two long alkyl side chains (C20-C32) at opposite sides form rhombic honeycombs with inner angles around 60/120°, occurring between triangular and square tiling patterns.
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Affiliation(s)
- Azhar Saeed
- Shaanxi International Research Center for Soft Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
| | - Marco Poppe
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120 Halle, Germany.
| | - Matthias B Wagner
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120 Halle, Germany.
| | - Sebastian Hauche
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120 Halle, Germany.
| | - Christian Anders
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120 Halle, Germany.
| | - Yu Cao
- Shaanxi International Research Center for Soft Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, P. R. China. .,MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Lei Zhang
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, P. R. China
| | - Carsten Tschierske
- Institute of Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes-Str. 2, 06120 Halle, Germany.
| | - Feng Liu
- Shaanxi International Research Center for Soft Matter, State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, P. R. China.
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Mohammady SZ, Aldhayan DM, Hagar M. Preparation and DFT Study for New Three-Ring Supramolecular H-Bonded Induced Liquid Crystal Complexes. Front Chem 2021; 9:679528. [PMID: 34150717 PMCID: PMC8213091 DOI: 10.3389/fchem.2021.679528] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/12/2021] [Indexed: 11/27/2022] Open
Abstract
Supramolecular three-ring Schiff base novel liquid crystal complexes have been prepared and investigated. Schiff bases of para-substituted aniline derivatives and para-pyridine carbaldehyde have been prepared and then mixed in equimolar quantities with para-alkoxy benzoic acids. On one side, the alkoxy chain length varies from 8 to 16 carbon atoms. On the other side, terminal small compact groups substituting aniline with various polarities are used. Hydrogen-bonding interaction was elucidated by FTIR spectroscopy. The mesomorphic thermal and optical characteristics of the samples were obtained by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). All samples exhibit enantiotropic mesophases. Experimental results obtained for the induced mesophases were correlated with density functional theory (DFT) theoretical calculations. The results revealed that both the polar compact groups' polarity and the alkoxy chain lengths contribute strongly to mesomorphic characteristics and thermal stabilities of the mesophases. Surprisingly, the observed values of enthalpy changes associated with the crystalline mesomorphic transitions lie in the range of 2.2-12.5 kJ/mol. However, the enthalpy changes corresponding to the mesomorphic-isotropic transitions vary from 0.9 to 13.9 kJ/mol, depending on the polarity of para-attached groups to the aniline moiety.
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Affiliation(s)
- Sayed Z. Mohammady
- Chemistry Department, Faculty of Science, King Saud University, Riyadh, Saudi Arabia
- Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Daifallah M. Aldhayan
- Chemistry Department, Faculty of Science, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed Hagar
- Chemistry Department, College of Sciences, Taibah University, Yanbu, Saudi Arabia
- Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
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Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation. CRYSTALS 2021. [DOI: 10.3390/cryst11060628] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of new supramolecular three-ring bent-shape Schiff base liquid crystal (LC) complexes were prepared and studied. On one side, two alkoxy chain lengths of the carboxylic acids were used, namely eight and sixteen carbons. Moreover, on the other side, terminal small compact groups, which substituted aniline, with different polarities were utilized. Furthermore, the hydrogen-bonding interactions in the formed complexes were elucidated by Fourier-transform infrared (FT–IR) spectroscopy. The mesomorphic thermal and optical characteristics of the samples were determined by differential thermal analysis (DSC) and polarized optical microscopy (POM). The complexes exhibited enantiotropic and dimorphic mesophase behaviors. The results indicate that the polarity of the compact groups and the lengths of the alkoxy chains greatly impacted the mesomorphic characteristics and thermal stabilities of the mesophases. The observed values of the enthalpy changes (ΔH) associated with the crystalline smectic-A (TCr-SmA) transitions were extremely small compared with the conventional values that characterize supramolecular hydrogen-bonded liquid crystalline complexes. ΔH, which corresponded to the nematic isotropic transitions (TN-I), varied from 0.13 to 9.54 kJ/mol depending mainly on the polarity of the groups that were para-attached to the aniline moiety. Finally, the theoretical results obtained by density functional theory (DFT) calculations were discussed. The DFT geometrical structures showed non-coplanar structures. The mesomorphic range was correlated with the calculated dipole moment, polarizability and the aspect ratios of the investigated compounds.
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Liu B, Yang T, Mu X, Mai Z, Li H, Wang Y, Zhou G. Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:448. [PMID: 33578814 PMCID: PMC7916626 DOI: 10.3390/nano11020448] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/22/2021] [Accepted: 02/08/2021] [Indexed: 12/18/2022]
Abstract
In a liquid crystal (LC) state, specific orientations and alignments of LC molecules produce outstanding anisotropy in structure and properties, followed by diverse optoelectronic functions. Besides organic LC molecules, other nonclassical components, including inorganic nanomaterials, are capable of self-assembling into oriented supramolecular LC mesophases by non-covalent interactions. Particularly, huge differences in size, shape, structure and properties within these components gives LC supramolecules higher anisotropy and feasibility. Therefore, hydrogen bonds have been viewed as the best and the most common option for supramolecular LCs, owing to their high selectivity and directionality. In this review, we summarize the newest advances in self-assembled structure, stimulus-responsive capability and application of supramolecular hydrogen-bonded LC nanosystems, to provide novel and immense potential for advancing LC technology.
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Affiliation(s)
- Bing Liu
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Tao Yang
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Xin Mu
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Zhijian Mai
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Hao Li
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Yao Wang
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Guofu Zhou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (B.L.); (T.Y.); (X.M.); (Z.M.); (G.Z.)
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, China
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