Helicity Control of Supramolecular Gel Fibers Consisting of an Achiral Ni<sup>II</sup> Complex in a Chiral Nematic Solvent

Maeda, Takatoshi; Kuwajima, Yuuki; Akita, Takuya; Iwai, Yosuke; Komiya, Naruyoshi; Uchida, Yoshiyuki

doi:10.1002/chem.201801992

Cited by 6 publications

(3 citation statements)

References 81 publications

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“…These results indicated that the induced chirality of the present TN–LC device can be amplified by doping more AIEgens. [ 23 ] In addition, we found that the TN–LC pretilt angle is strongly dependent on the fabrication process of the alignment layer such as the rubbing counts. [ 24 ] The TN–LC device fabricated from alignment layers with more rubbing counts showed stronger CD and CPL signals (Figure 3C,F and Figure S5, Supporting Information), which well matched with our expectation that the stronger directivity of the alignment films would promote better chiral performance.…”

Section: Resultsmentioning

confidence: 99%

From Molecular Achirality to Mesoscopic Helicity: Toward the Development of Circularly Polarized Luminescence‐Emitting Liquid Crystal Displays

Zhang

Song

et al. 2020

Small Structures

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Chirality is a fundamental but crucial asymmetry feature of the living world and is ubiquitous in almost all biological structures of different levels and biomaterials. [1] Since the differentiation of Land D-tartaric acid in the 19th century, molecular chirality has attracted great attention of chemists and pharmacologists. [2] And researchers have been making great efforts to produce chirality at the molecular level due to its indispensable importance. However, the synthesis of chiral compounds including chiral drugs and the production of pure enantiomers often require painstaking preparation, separation, and purification processes. Particularly, the use of chiral separation columns makes the approach to molecular chirality relatively complicated and expensive. [3] Although chirality at the molecular level is for real functionalization and application in the living world and artificial materials, a higher level of chirality involving the highly ordered molecular architectures, i.e., assembled supramolecular chirality, is indispensable. [4] Specifically, large numbers of biological functions from selective recognition of cell membranes to vivid colors in various organisms such as butterflies are macroscopic effects resulted from molecular assemblies. [5] In addition, the realizations of the ultimate functionality of artificial materials usually rely on a higher level of molecular architectures. However, compared with the research on molecular level, the studies on supramolecular chirality are lagging behind due to the complexity of chiral architectures. [6] Moreover, in most reported cases, the symmetry breaking effect at the supramolecular level requires the introduction of chiral components, such as chiral molecules, chiral dopants, or chiral mediums. [4,7,8] Thus, we wonder whether it is possible to construct a mesoscopic chiral system from a series of achiral components? In another aspect, chiral architectures with luminophoric units may show circularly polarized luminescence (CPL), [8] and such materials have attracted much attention due to their potential applications in chiroptical devices, optical communication, and 3D display. [9] Especially, to pursue the prospect of display, more advanced devices such as circularly polarized organic light-emitting diodes (CPOLEDs) and electric-field-induced reversible CPL switches should be developed, which correspond to the two common techniques of light-emitting diodes (LEDs) and liquid crystal (LC) display (LCD) in display devices. [10] Although LCD is still a mature technique and shares the major market of large screen display, the must requirement of a backlight is its evitable drawback. Additionally, its efficiency of light utilization is very low due to the inserted two polarizers. [11] LCD tends to be nonluminescent because the luminophores utilized usually suffer from aggregation-caused emission quenching in liquid crystalline matrix. [12] In contrast, aggregation-induced emission (AIE) luminogens (AIEgens) show strong emission in their condensed state, which...

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Section: Resultsmentioning

confidence: 99%

From Molecular Achirality to Mesoscopic Helicity: Toward the Development of Circularly Polarized Luminescence‐Emitting Liquid Crystal Displays

Zhang

Song

et al. 2020

Small Structures

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“…Naota and co‐workers demonstrated chirality transfer from solvent (chiral nematic liquid crystals) to achiral solute molecules ( trans ‐bis(salicylaldiminato)nickel(II) complexes) to form supramolecular chiral fibers. [ 107 ] The used achiral coordination complexes usually form achiral supramolecular fibers in achiral nematic‐liquid‐crystalline phases and non‐mesogenic crystals. In contrast, helicity intensity and direction of the supramolecular gel fibers can be controlled in chiral nematic liquid crystals as solvents depending on helical twisting nature and chiral dopant concentrations.…”

Section: Chiral Nanoarchitectonics Of Mesoscopic Materials: Liquid Crmentioning

confidence: 99%

Supramolecular Chiral Nanoarchitectonics

et al. 2020

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of well-considered materials designs. [5] Small structural differences in component molecules are often capable of producing materials with totally different properties through organic syntheses, [6] supramolecular chemistry, [7] and materials processing. [8] Therefore, molecular designs for materials production can be regarded as the most important issue in science and technology in current society. Amongst the many possibilities in molecular design for materials production, exploration of molecular functions and material properties on the basis of chirality controls would be a scientifically elegant approach. With identical elemental compositions and functional groups, but different configurations of these identical groups, functions such as chiroptical properties and chiral separations can be created. [9] Another important fact for chiral controls in molecular and materials science is the unavoidable deep relationship of chiral substances with biological activities. [10] Biomolecules are basically made of chiral components such as amino acids and saccharides. Therefore, molecular designs for biomedical drugs and bioactive materials must be produced upon critical control of their chirality. Due to the scientifically elegant approaches and biological importance, molecular sciences and materials technologies incorporating chirality continuously attract attention of scientists ranging from the fundamentals of the chirality of molecules and materials to bio-related applications. These research efforts spread into a wide range of scientific fields including basic physical chemistry, [11] chirality-controlled catalysis and synthesis, [12] chiral materials, [13] analyses of chiral structures, [14] chiral recognition, [15] chiral separation, [16] chiral plasmons and optics, [17] chiral drugs, [18] and biomedical related chiral sciences. [19] Among the broad interests of chirality research, the recent hot trends of chirality related sciences are probably studies on chirality-based supramolecular chemistry and materials science upon the self-assembly of chiral molecular components [20] and achiral building blocks. [21] Enhancement of chiral effects and the creation of chirality are sometimes results of supramolecular organizations with chiral molecular units and even with achiral components. These systems are regarded as elegant examples of the emerging concept of nanoarchitectonics (Figure 1), [22] because control of simple molecular configurations can lead to the creation of such a wide variety of functional materials. The nanoarchitectonics concept was originally proposed by Aono and co-workers [23] as methodology to create functional materials from nanosized components through the combined Exploration of molecular functions and material properties based on the control of chirality would be a scientifically elegant approach. Here, the fabrication and function of chiral-featured materials from both chiral and achiral components using a supramolecular nanoarchitectonics concept are discussed. The contents are classified...

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“…(Figure 13). 73 The supramolecular chirality of aggregates made of achiral transbis(salicylaldiminato)Ni II complex having long alkyl chains can be precisely controlled within strong chirality-inductive environment of chiral nematic liquid crystalline phase, while any chirality was not induced in achiral nematic liquid crystalline media. In the former case, direction and intensity in the helicity of the complex aggregates can be regulated by the helical twisting nature and the chiral dopants concentrations.…”

Section: Figure 8 Kinetic Investigation On Molecular Recognition Andmentioning

confidence: 99%

Nanoarchitectonics for Coordination Asymmetry and Related Chemistry

Ariga

Shionoya

2020

Bulletin of the Chemical Society of Japan

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Nanoarchitectonics is a concept envisioned to produce functional materials from nanoscale units through fusion of nanotechnology with other scientific disciplines. For component selection, coordination complexes with metallic elements have a wider variety of element selection because metallic elements cover ca. 80% of the periodic table of the elements. Application of nanoarchitectonics approaches to coordination chemistry leads to huge expansion of this concept to a much wider range of elements. Especially, coordination asymmetry strategy architects asymmetrical and/or chiral structures and/or electronic states through formation of metal coordination complexes, leading to functional material systems in certain anisotropy and selectivity. This review article presents expansion of the nanoarchitectonics concept to coordination asymmetry through collecting recent examples in the field of coordination asymmetry. Introduced examples are classified into several categories from various viewpoints: (i) basic molecular and material designs; (ii) specific features depending on interfacial media, space and contact with bio-functions; (iii) functions; (iv) supporting techniques such as analyses and theory.

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Helicity Control of Supramolecular Gel Fibers Consisting of an Achiral Ni^II Complex in a Chiral Nematic Solvent

Cited by 6 publications

References 81 publications

From Molecular Achirality to Mesoscopic Helicity: Toward the Development of Circularly Polarized Luminescence‐Emitting Liquid Crystal Displays

From Molecular Achirality to Mesoscopic Helicity: Toward the Development of Circularly Polarized Luminescence‐Emitting Liquid Crystal Displays

Supramolecular Chiral Nanoarchitectonics

Nanoarchitectonics for Coordination Asymmetry and Related Chemistry

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Helicity Control of Supramolecular Gel Fibers Consisting of an Achiral NiII Complex in a Chiral Nematic Solvent

Cited by 6 publications

References 81 publications

From Molecular Achirality to Mesoscopic Helicity: Toward the Development of Circularly Polarized Luminescence‐Emitting Liquid Crystal Displays

From Molecular Achirality to Mesoscopic Helicity: Toward the Development of Circularly Polarized Luminescence‐Emitting Liquid Crystal Displays

Supramolecular Chiral Nanoarchitectonics

Nanoarchitectonics for Coordination Asymmetry and Related Chemistry

Contact Info

Product

Resources

About

Helicity Control of Supramolecular Gel Fibers Consisting of an Achiral Ni^II Complex in a Chiral Nematic Solvent