A self-assembled liquid crystal honeycomb of highly stretched (3-1-1)-hexagons

Scholte, Alexander; Hauche, Sebastian; Prehm, Marko; Poppe, Silvio; Chen, Changlong; Liu, Feng; Zeng, Xiangbing; Ungar, Goran; Tschierske, Carsten

doi:10.1039/c9cc08502e

Cited by 8 publications

(7 citation statements)

References 32 publications

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“…Many supramolecular LC systems were formed between LC molecules, units or other components, and appeared in different new phases [ 32 , 33 , 34 , 35 ]. Different from conventional LC, these highly ordered supramolecular architectures would be paid much attention due the response ability, not the nature of LC (e.g., phase transition, thermal stability and spatial order).…”

Section: Supramolecular Liquid Crystalsmentioning

confidence: 99%

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Liu

Yang

et al. 2021

Nanomaterials

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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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Section: Supramolecular Liquid Crystalsmentioning

confidence: 99%

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Liu

Yang

et al. 2021

Nanomaterials

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“…These molecules are grouped together by second-order (noncovalent) bonds, for example, hydrogen bonds, halogen bonds, pi agglutination, van der Waals forces, coordination bonds, and dipole-dipole interactions (Borissova et al, 2008) (Arunan et al, 2011) (Shimizu and Ferreira Da Silva, 2018). Liquid crystals (LCs) are considered among the most important formative materials that can be produced by supramolecular assembly (Park et al, 2015) (Sun et al, 2015) (Alnoman et al, 2020) (Scholte et al, 2020). The created assemblies in liquid crystals have been used for diverse applications (Chen et al, 2013) (Chen et al, 2014) (Todisco et al, 2018) (Guan et al, 2019) (Foelen et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Preparation and DFT Study for New Three-Ring Supramolecular H-Bonded Induced Liquid Crystal Complexes

2021

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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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“…These molecules are grouped by second-order (non-covalent) bonds, e.g., hydrogen bonds, halogen bonds, pi agglutination, van der Waals forces, coordination bonds, and dipole-dipole interactions [1][2][3]. Liquid crystals (LCs) are among the most valuable formative materials that can be produced by supramolecular assembling [4][5][6][7], and these generated assemblies in LCs have been employed in diverse applications [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation

2021

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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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A self-assembled liquid crystal honeycomb of highly stretched (3-1-1)-hexagons

Abstract: Polyphilic molecules form a new highly stretched liquid crystal honeycomb when the attached chains are too long for a regular hexagonal honeycomb and too short for a lamellar structure.

Cited by 8 publications

References 32 publications

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Smart Supramolecular Self-Assembled Nanosystem: Stimulus-Responsive Hydrogen-Bonded Liquid Crystals

Preparation and DFT Study for New Three-Ring Supramolecular H-Bonded Induced Liquid Crystal Complexes

Pyridine-Based Three-Ring Bent-Shape Supramolecular Hydrogen Bond-Induced Liquid Crystalline Complexes: Preparation and Density Functional Theory Investigation

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