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Jedrych A, Pawlak M, Gorecka E, Lewandowski W, Wojcik MM. Light-Responsive Supramolecular Nanotubes-Based Chiral Plasmonic Assemblies. ACS NANO 2023; 17:5548-5560. [PMID: 36897199 PMCID: PMC10062029 DOI: 10.1021/acsnano.2c10955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
We describe the fabrication of dual-responsive (thermo/light) chiral plasmonic films. The idea is based on using photoswitchable achiral liquid crystal (LCs) forming chiral nanotubes for templating helical assemblies of Au NPs. Circular dichroism spectroscopy (CD) confirms chiroptical properties coming from the arrangement of organic and inorganic components, with up to 0.2 dissymmetry factor (g-factor). Upon exposure to UV light, organic molecules isomerize, resulting in controlled melting of organic nanotubes and/or inorganic nanohelices. The process can be reversed using visible light and further modified by varying the temperature, offering a control of chiroptical response of the composite material. These properties can play a key role in the future development of chiral plasmonics, metamaterials, and optoelectronic devices.
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2
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Fa S, Mizobata M, Nagano S, Suetsugu K, Kakuta T, Yamagishi TA, Ogoshi T. Reversible "On/Off" Chiral Amplification of Pillar[5]arene Assemblies by Dual External Stimuli. ACS NANO 2021; 15:16794-16801. [PMID: 34542992 DOI: 10.1021/acsnano.1c06975] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We report dual-stimuli, thermo- and photostimuli, responsive chiral assemblies, of planar-chiral pillar[5]arenes with azobenzene groups on their rims. The azobenzene-substituted planar-chiral pillar[5]arenes were synthesized by copper(I)-catalyzed alkyne-azide cycloaddition "click" reaction of azide-substituted planar-chiral pillar[5]arenes containing S or R stereogenic carbon atoms with an alkyne-substituted azobenzene. These decaazides with stereogenic carbons could act as starting points for a large library of planar-chiral pillar[5]arenes. Homeotropic alignment of azobenzenes, caused by the mesogenic property of the azobenzene groups, was induced by annealing a film of the azobenzene-substituted planar-chiral pillar[5]arenes. The alignment resulted in chiral propagation from the planar-chiral pillar[5]arene cores to the azobenzene area and caused significant chiral amplification consequently. These aligned chiral assemblies were collapsed by trans to cis photoisomerization of the azobenzene groups, resulting in chiral amplification off, and reconstructed by cis to trans thermo-isomerization, again turning on the chiral amplification.
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Affiliation(s)
- Shixin Fa
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Masayuki Mizobata
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Shusaku Nagano
- College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - Kota Suetsugu
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8603, Japan
| | - Takahiro Kakuta
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Tada-Aki Yamagishi
- Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
| | - Tomoki Ogoshi
- Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
- WPI Nano Life Science Institute (Nano-LSI), Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan
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3
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Kim JY, Lee JJ, Park JS, Choi YJ, Choi SW. Control of the Induced Handedness of Helical Nanofilaments Employing Cholesteric Liquid Crystal Fields. Molecules 2021; 26:molecules26196055. [PMID: 34641599 PMCID: PMC8512387 DOI: 10.3390/molecules26196055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 10/04/2021] [Accepted: 10/05/2021] [Indexed: 11/16/2022] Open
Abstract
In this paper, a simple and powerful method to control the induced handedness of helical nanofilaments (HNFs) is presented. The nanofilaments are formed by achiral bent-core liquid crystal molecules employing a cholesteric liquid crystal field obtained by doping a rod-like nematogen with a chiral dopant. Homochiral helical nanofilaments are formed in the nanophase-separated helical nanofilament/cholesteric phase from a mixture with a cholesteric phase. This cholesteric phase forms at a temperature higher than the temperature at which the helical nanofilament in a bent-core molecule appears. Under such conditions, the cholesteric liquid crystal field acts as a driving force in the nucleation of HNFs, realizing a perfectly homochiral domain consisting of identical helical nanofilament handedness.
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4
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Liang J, Liang J, Hao A, Xing P. Symmetry breaking-induced double-strand helices in H-bonded coassembly. NANOSCALE 2021; 13:12929-12937. [PMID: 34477776 DOI: 10.1039/d1nr02515e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Double-strand helical structures are important in information storage of biomacromolecules, while the artificial synthesis depends on chirality transfer from the molecular to supramolecular scale, and the synthesis through symmetry breaking has yet been accomplished. In this work, we present the multiple-constituent coassembly of a melamine derivative and an N-terminal aromatic amino acid into double helical nanoarchitectures via symmetry breaking. Multiple intramolecular H-bond formation between constituents played key roles in directing the formation of helical structures. Intertwining of single helices with identical helical parameters afforded double helical structures, benefiting from the uniformity and monodispersity of nanoarchitectures. With introduction of coded chiral amino acid derivatives as chiral sources, the handedness could be readily manipulated with exclusive correlation to the absolute chirality of amino acids. Molecular flexibility of the melamine derivative facilitates the propeller-shaped complex formation to afford helical columnar coassemblies and double helical structures. This work presents a rational control over the emergence and properties of double helical structures in multiple-constituent coassemblies through symmetry breaking, which provides an alternative method towards the synthesis of topological chiral composites and chiroptical materials.
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Affiliation(s)
- Juncong Liang
- Key Laboratory of Colloid and Interface Chemistry of Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, People's Republic of China.
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5
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Yang B, Zou G, Zhang S, Ni H, Wang H, Xu W, Yang C, Zhang H, Yu W, Luo K. Biased Symmetry Breaking and Chiral Control by Self-Replicating in Achiral Tetradentate Platinum (II) Complexes. Angew Chem Int Ed Engl 2021; 60:10531-10536. [PMID: 33682280 DOI: 10.1002/anie.202101709] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 02/26/2021] [Indexed: 01/03/2023]
Abstract
Obtaining homochirality from biased symmetry-breaking of self-assembly in achiral molecules remains a great challenge due to the lack of ingenious strategies and controlling their handedness. Here, we report the first case of biased symmetry breaking from achiral platinum (II) liquid crystals which self-organize into an enantiomerically enriched single domain without selection of handedness in twist grain boundary TGB [ *] phase. Most importantly, the chiral control of self-organization can be achieved by using above the homochiral liquid crystal films with determined handedness (P or M) as a template. Moreover, benefiting from self-assembled superhelix, these complexes exhibit prominent circularly polarized luminescence with high |glum | up to 3.4×10-3 in the TGB [ *] mesophase. This work paves a neoteric avenue for the development of chiral self-assemblies from achiral molecules.
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Affiliation(s)
- Bo Yang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610000, P. R. China
| | - Guo Zou
- Department of Chemistry, Xiamen University, Xiamen, 361000, P. R. China
| | - Shilin Zhang
- Department of Chemistry, Xiamen University, Xiamen, 361000, P. R. China
| | - Hailiang Ni
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610000, P. R. China
| | - Haifeng Wang
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610000, P. R. China
| | - Wei Xu
- College of Chemistry and State Key Laboratory of Biotherapy, Healthy Food Evaluation Research Center, Sichuan University, Chengdu, 610000, P. R. China
| | - Cheng Yang
- College of Chemistry and State Key Laboratory of Biotherapy, Healthy Food Evaluation Research Center, Sichuan University, Chengdu, 610000, P. R. China
| | - Hui Zhang
- Department of Chemistry, Xiamen University, Xiamen, 361000, P. R. China
| | - Wenhao Yu
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610000, P. R. China
| | - Kaijun Luo
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610000, P. R. China
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6
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Yang B, Zou G, Zhang S, Ni H, Wang H, Xu W, Yang C, Zhang H, Yu W, Luo K. Biased Symmetry Breaking and Chiral Control by Self‐Replicating in Achiral Tetradentate Platinum (II) Complexes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101709] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Bo Yang
- College of Chemistry and Materials Science Sichuan Normal University Chengdu 610000 P. R. China
| | - Guo Zou
- Department of Chemistry Xiamen University Xiamen 361000 P. R. China
| | - Shilin Zhang
- Department of Chemistry Xiamen University Xiamen 361000 P. R. China
| | - Hailiang Ni
- College of Chemistry and Materials Science Sichuan Normal University Chengdu 610000 P. R. China
| | - Haifeng Wang
- College of Chemistry and Materials Science Sichuan Normal University Chengdu 610000 P. R. China
| | - Wei Xu
- College of Chemistry and State Key Laboratory of Biotherapy Healthy Food Evaluation Research Center Sichuan University Chengdu 610000 P. R. China
| | - Cheng Yang
- College of Chemistry and State Key Laboratory of Biotherapy Healthy Food Evaluation Research Center Sichuan University Chengdu 610000 P. R. China
| | - Hui Zhang
- Department of Chemistry Xiamen University Xiamen 361000 P. R. China
| | - Wenhao Yu
- College of Chemistry and Materials Science Sichuan Normal University Chengdu 610000 P. R. China
| | - Kaijun Luo
- College of Chemistry and Materials Science Sichuan Normal University Chengdu 610000 P. R. China
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7
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Preferential Circularly Polarized Luminescence from a Nano-Segregated Liquid Crystalline Phase Using a Polymerized Twisted Nematic Platform. Polymers (Basel) 2020; 12:polym12112529. [PMID: 33138132 PMCID: PMC7693453 DOI: 10.3390/polym12112529] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2020] [Revised: 10/23/2020] [Accepted: 10/26/2020] [Indexed: 11/17/2022] Open
Abstract
In this study, a polymerized twisted nematic (TN) network was used as an extrinsic chiral platform to overcome the heterogeneity during spontaneous symmetry breaking in a mixed system comprising an achiral bent-core molecule and rod-like mesogen. The TN platform was prepared by photopolymerizing a reactive mesogen dispersed in a low molecular weight liquid crystal with TN orientation. The use of TN orientation to correct the degeneracy in bent-core molecular systems has been previously reported; however, to the best of our knowledge, this is the first study that uses an extrinsic chiral platform of a polymerized TN network. The heterogeneity in the nano-segregated phase of the achiral mixture was suppressed using the extrinsic TN platform with a twisted angle θ of ≥ |±30°|. When an achiral mixture doped with a luminescent guest molecule was refilled into the extrinsic chiral platform, preferential deracemization with one-handedness occurred, corresponding to the handedness of the TN platform. Therefore, circularly polarized luminescence with a preferential handedness can be achieved using this extrinsic chiral platform.
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8
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Bazavan O, Saha SK, Paul MK, Dierking I. Chiral domain formation and spontaneous de-racemization in the Dark Conglomerate phase of a bent-core liquid crystal. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Lewandowski W, Vaupotič N, Pociecha D, Górecka E, Liz-Marzán LM. Chirality of Liquid Crystals Formed from Achiral Molecules Revealed by Resonant X-Ray Scattering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1905591. [PMID: 32529663 DOI: 10.1002/adma.201905591] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 03/14/2020] [Accepted: 03/16/2020] [Indexed: 05/21/2023]
Abstract
Intensive research on chiral liquid crystals (LCs) has been fueled by their actively tunable physicochemical properties and structural complexity, comparable to those of sophisticated natural materials. Herein, recent progress in the discovery of new classes of chiral LCs, enabled by a combination of nano- and macroscale investigations is reviewed. First, an overview is provided of liquid crystalline phases, made of chiral and achiral low-weight molecules, that exhibit chiral structure and/or chiral morphology. Then, recent progress in the discovery of new classes of chiral LCs, particularly enabled by the application of resonant X-ray scattering is described. It is shown that the method is sensitive to modulations of molecular orientation and therefore provides information hardly accessible by means of other techniques, such as the sense of helical structures or chirality transfer across length scales. Finally, a perspective is presented on the future scope, opportunities, and challenges in the field of chiral LCs, in particular related to nanocomposites.
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Affiliation(s)
- Wiktor Lewandowski
- Faculty of Chemistry, University of Warsaw, Pasteura 1 St., Warsaw, 02-093, Poland
| | - Nataša Vaupotič
- Department of Physics, University of Maribor, Koroška 160, Maribor, 2000, Slovenia
- Jozef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia
| | - Damian Pociecha
- Faculty of Chemistry, University of Warsaw, Pasteura 1 St., Warsaw, 02-093, Poland
| | - Ewa Górecka
- Faculty of Chemistry, University of Warsaw, Pasteura 1 St., Warsaw, 02-093, Poland
| | - Luis M Liz-Marzán
- CIC biomaGUNE and CIBER-BBN, Paseo de Miramón 182, Donostia-San Sebastián, 20014, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, 48013, Spain
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10
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Alaasar M, Prehm M, Belau S, Sebastián N, Kurachkina M, Eremin A, Chen C, Liu F, Tschierske C. Polar Order, Mirror Symmetry Breaking, and Photoswitching of Chirality and Polarity in Functional Bent‐Core Mesogens. Chemistry 2019; 25:6362-6377. [DOI: 10.1002/chem.201806180] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/21/2019] [Indexed: 01/06/2023]
Affiliation(s)
- Mohamed Alaasar
- Institute of ChemistryMartin Luther University Halle-Wittenberg Kurt Mothes Str. 2 06120 Halle (Saale) Germany
- Department of Chemistry, Faculty of ScienceCairo University Giza Egypt
| | - Marko Prehm
- Institute of ChemistryMartin Luther University Halle-Wittenberg Kurt Mothes Str. 2 06120 Halle (Saale) Germany
| | - Sebastian Belau
- Department of Nonlinear Phenomena, Institute of PhysicsOtto von Guericke University Magdeburg Magdeburg Germany
| | - Nerea Sebastián
- Department of Nonlinear Phenomena, Institute of PhysicsOtto von Guericke University Magdeburg Magdeburg Germany
| | - Marharyta Kurachkina
- Department of Nonlinear Phenomena, Institute of PhysicsOtto von Guericke University Magdeburg Magdeburg Germany
| | - Alexey Eremin
- Department of Nonlinear Phenomena, Institute of PhysicsOtto von Guericke University Magdeburg Magdeburg Germany
| | - Changlong Chen
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong University Xi'an 710049 P. R. China
| | - Feng Liu
- State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong University Xi'an 710049 P. R. China
| | - Carsten Tschierske
- Institute of ChemistryMartin Luther University Halle-Wittenberg Kurt Mothes Str. 2 06120 Halle (Saale) Germany
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11
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Sasaki H, Takanishi Y, Yamamoto J, Yoshizawa A. Achiral flexible liquid crystal trimers exhibiting gyroid-like surfaces in chiral conglomerate phases. SOFT MATTER 2017; 13:6521-6528. [PMID: 28895612 DOI: 10.1039/c7sm01499f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chiral conglomerate phases have attracted much attention not only for the spontaneous mirror symmetry breaking but also for their nanostructures. We investigated both surface and bulk structures of a homologues series of an achiral liquid crystal trimer I-(n,m) exhibiting soft crystalline chiral conglomerate phases by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The trimers were found to form bicontinuous networks. In particular, trimer I-(9,9) exhibited a single gyroid-like surface accompanying periodic distribution of dimples with a size of about 100 nm. It showed a sponge-like structure in the bulk of the material. The twist conformation of the flexible trimer I-(n,m) can cause layer deformation, which produces bicontinuous networks exhibiting optical activity.
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Affiliation(s)
- Haruna Sasaki
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, 036-8561, Japan.
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12
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Wang WZ, Gao C, Zhang Q, Ye XH, Qu DH. Supramolecular Helical Nanofibers Formed by Achiral Monomers and Their Reversible Sol-Gel Transition. Chem Asian J 2017; 12:410-414. [PMID: 28098435 DOI: 10.1002/asia.201601733] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 01/14/2017] [Indexed: 11/11/2022]
Abstract
Well-defined supramolecular helical nanofibers have been constructed by a rationally designed achiral monomer in aqueous solution based on the 1:2 host-guest combination between cucurbit[8]uril and a 4,4'-bipyridin-1-ium chloride (BPY+ ) salt derivative. The formed nanostructures could be adjusted by varying the concentration of monomer from helical nanofibers to a pH-responsive hydrogel.
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Affiliation(s)
- Wen-Zhi Wang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
| | - Chuan Gao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
| | - Qi Zhang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
| | - Xu-Hao Ye
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
| | - Da-Hui Qu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, China
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13
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Choi SW, Takezoe H. Enhancing and reducing chirality by opposite circularly-polarized light irradiation on crystalline chiral domains consisting of nonchiral photoresponsive W-shaped liquid crystal molecules. SOFT MATTER 2016; 12:7937-7942. [PMID: 27714293 DOI: 10.1039/c6sm01343k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We found possible chirality enhancement and reduction in chiral domains formed by photoresponsive W-shaped molecules by irradiation with circularly polarized light (CPL). The W-shaped molecules exhibit a unique smectic phase with spontaneously segregated chiral domains, although the molecules are nonchiral. The chirality control was generated in the crystalline phase, which shows chiral segregation as in the upper smectic phase, and the result appeared to be as follows: for a certain chiral domain, right-CPL stimuli enhanced the chirality, while left-CPL stimuli reduced the chirality, and vice versa for another chiral domain. Interestingly, no domain-size change could be observed after CPL irradiation, suggesting some changes in the causes of chirality. In this way, the present system can recognize the handedness of the applied chiral stimuli. In other words, the present material can be used as a sensitive chiral-stimuli-recognizing material and should find invaluable applications, including in chiroptical switches, sensors, and memories as well as in chiral recognition.
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Affiliation(s)
- Suk-Won Choi
- Department of Advance Materials Engineering for Information and Electronics, Kyung Hee University, Yongin-shi, Gyeonggi-do 446-701, Korea. and Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan
| | - Hideo Takezoe
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8552, Japan and Toyota Physical and Chemical Research Institute, 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.
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14
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From Sponges to Nanotubes: A Change of Nanocrystal Morphology for Acute-Angle Bent-Core Molecules. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604915] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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From Sponges to Nanotubes: A Change of Nanocrystal Morphology for Acute-Angle Bent-Core Molecules. Angew Chem Int Ed Engl 2016; 55:12238-42. [DOI: 10.1002/anie.201604915] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Revised: 07/18/2016] [Indexed: 11/07/2022]
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16
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Yoshizawa A, Kato Y, Sasaki H, Takanishi Y, Yamamoto J. Optically Isotropic Homochiral Structure Produced by Intercalation of Achiral Liquid Crystal Trimers. J Phys Chem B 2016; 120:4843-51. [DOI: 10.1021/acs.jpcb.6b01242] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Atsushi Yoshizawa
- Department
of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Yusuke Kato
- Department
of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Haruna Sasaki
- Department
of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan
| | - Yoichi Takanishi
- Department
of Physics, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa,
Sakyo-ku, Kyoto, 606-8562, Japan
| | - Jun Yamamoto
- Department
of Physics, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa,
Sakyo-ku, Kyoto, 606-8562, Japan
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17
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Sasaki H, Takanishi Y, Yamamoto J, Yoshizawa A. Achiral flexible liquid crystal trimers exhibiting chiral conglomerates. SOFT MATTER 2016; 12:3331-3339. [PMID: 26947890 DOI: 10.1039/c5sm02969d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Chiral conglomerates of domains with opposite handedness have attracted much attention from researchers. We prepared a homologous series of achiral liquid crystal trimers in which two phenylpyrimidine units and one biphenyl unit were connected via flexible methylene spacers. We investigated their phase transition behaviour. Some trimers possessing odd-numbered spacers were found to exhibit a nematic phase and a dark chiral conglomerate phase possessing a layered structure. The chiral characteristics were confirmed by uncrossing the polarizers in opposite directions. The layer spacing detected using X-ray diffraction was about 80% of the molecular length. The structure-property relations indicate that intermolecular interactions cause a conformational change in the trimers possessing flexible odd-numbered methylene spacers to form helical conformers with axial chirality, which might induce chiral segregation and layer deformation to drive the chiral conglomerates.
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Affiliation(s)
- Haruna Sasaki
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, 036-8561, Japan.
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18
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Alaasar M, Prehm M, Tschierske C. Helical Nano-crystallite (HNC) Phases: Chirality Synchronization of Achiral Bent-Core Mesogens in a New Type of Dark Conglomerates. Chemistry 2016; 22:6583-97. [DOI: 10.1002/chem.201505016] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Indexed: 12/20/2022]
Affiliation(s)
- Mohamed Alaasar
- Institute of Chemistry; Martin Luther University Halle-Wittenberg; Kurt Mothes Str. 2 06120 Halle (Saale) Germany), Fax
- Department of Chemistry; Faculty of Science; Cairo University; Giza Egypt
| | - Marko Prehm
- Institute of Chemistry; Martin Luther University Halle-Wittenberg; Kurt Mothes Str. 2 06120 Halle (Saale) Germany), Fax
| | - Carsten Tschierske
- Institute of Chemistry; Martin Luther University Halle-Wittenberg; Kurt Mothes Str. 2 06120 Halle (Saale) Germany), Fax
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19
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Shen Z, Jiang Y, Wang T, Liu M. Symmetry Breaking in the Supramolecular Gels of an Achiral Gelator Exclusively Driven by π-π Stacking. J Am Chem Soc 2015; 137:16109-15. [PMID: 26647220 DOI: 10.1021/jacs.5b10496] [Citation(s) in RCA: 177] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Supramolecular symmetry breaking, in which chiral assemblies with imbalanced right- and left-handedness emerge from achiral molecular building blocks, has been achieved in the organogels of a C3-symmetric molecule only via π-π stacking. Specifically, an achiral C3-symmetric benzene-1,3,5-tricarboxylate substituted with methyl cinnamate through ester bond was found to form organogels in various organic solvents. More interestingly, when gels formed in cyclohexane, symmetry breaking occurred; i.e., optically active organogels together with the helical nanofibers with predominant handedness were obtained. Furthermore, the stochastically appeared imbalanced helicity could be driven to desired handedness by utilizing slight chiral solvents such as (R)- or (S)-terpinen-4-ol. Remarkably, the handedness of supramolecular assemblies thus formed could be kept even when the chiral solvents were removed. For the first time, we show that symmetry breaking can occur in supramolecular gel system driven exclusively through π-π stacking.
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Affiliation(s)
- Zhaocun Shen
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| | - Yuqian Jiang
- National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Tianyu Wang
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China
| | - Minghua Liu
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, P. R. China.,National Center for Nanoscience and Technology, Beijing 100190, P. R. China.,Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, P. R. China
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Yoshizawa A, Kato Y, Sasaki H, Takanishi Y, Yamamoto J. Chiral conglomerates observed for a binary mixture of a nematic liquid crystal trimer and 6OCB. SOFT MATTER 2015; 11:8827-8833. [PMID: 26395546 DOI: 10.1039/c5sm02121a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dark conglomerates of domains with opposite handedness, which are designated as dark conglomerate phases (DC phases), have attracted much attention. After designing an achiral liquid crystal trimer, 4,4′-bis{7-[4-(5-octyloxypyrimidin-2-yl)phenyloxy]heptyloxy}biphenyl (1), which exhibits only a nematic phase, we prepared binary mixtures with some typical rod-like nematic liquid crystals, i.e., 4′-hexyloxy-4-cyanobiphenyl (6OCB), 2-(4-hexyloxyphenyl)-5-pentyloxypyrimidine (PPY), or 4-methyloxyphenyl 4-hexyloxycyclohexanecarboxylate (PCA), and investigated their phase transition behaviour. The binary mixtures containing 55–90 mol% of 6OCB were found to exhibit a nematic phase and a DC phase of chiral domains with opposite handedness. However, neither PPY nor PCA induced such a chiral conglomerate phase in the mixture with trimer 1. We discuss how core–core interactions contribute to produce such a chiral conglomerate phase.
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Affiliation(s)
- Atsushi Yoshizawa
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.
| | - Yusuke Kato
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.
| | - Haruna Sasaki
- Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.
| | - Yoichi Takanishi
- Department of Physics, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8562, Japan
| | - Jun Yamamoto
- Department of Physics, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto, 606-8562, Japan
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21
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Diastereomeric liquid crystal domains at the mesoscale. Nat Commun 2015; 6:7763. [PMID: 26249039 DOI: 10.1038/ncomms8763] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 06/08/2015] [Indexed: 12/11/2022] Open
Abstract
In many technologies used to achieve separation of enantiomers, chiral selectors are designed to display differential affinity for the two enantiomers of a chiral compound. Such complexes are diastereomeric, differing in structure and free energy for the two enantiomers and enabling chiral discrimination. Here we present evidence for strong diastereomeric interaction effects at the mesoscale, manifested in chiral liquid crystal guest materials confined in a chiral, nanoporous network of semi-crystalline helical nanofilaments. The nanoporous host is itself an assembly of achiral, bent-core liquid crystal molecules that phase-separate into a conglomerate of 100 micron-scale, helical nanofilament domains that differ in structure only in the handedness of their homogeneous chirality. With the inclusion of a homochiral guest liquid crystal, these enantiomeric domains become diastereomeric, exhibiting unexpected and markedly different mesoscale structures and orientation transitions producing optical effects in which chirality has a dominant role.
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22
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Affiliation(s)
- Minghua Liu
- Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Li Zhang
- Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Tianyu Wang
- Beijing National Laboratory for Molecular Science (BNLMS), CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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23
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Zhu Y, Xu Y, Zou G, Zhang Q. Chirality Transfer and Modulation in LB Films Derived From the Diacetylene/Melamine Hydrogen-Bonded Complex. Chirality 2015; 27:492-9. [DOI: 10.1002/chir.22449] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 03/14/2015] [Accepted: 03/16/2015] [Indexed: 01/01/2023]
Affiliation(s)
- Yu Zhu
- CAS Key Laboratory of Soft Matter Chemistry; Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China; Hefei Anhui People's Republic of China
| | - Yangyang Xu
- CAS Key Laboratory of Soft Matter Chemistry; Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China; Hefei Anhui People's Republic of China
| | - Gang Zou
- CAS Key Laboratory of Soft Matter Chemistry; Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China; Hefei Anhui People's Republic of China
| | - Qijin Zhang
- CAS Key Laboratory of Soft Matter Chemistry; Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China; Hefei Anhui People's Republic of China
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Sasaki H, Takanishi Y, Yamamoto J, Yoshizawa A. Supermolecular Bent Configuration Composed of Achiral Flexible Liquid Crystal Trimers Exhibiting Chiral Domains with Opposite Handedness. J Phys Chem B 2015; 119:4531-8. [DOI: 10.1021/jp512710r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Haruna Sasaki
- Department
of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, 036-8561, Japan
| | - Yoichi Takanishi
- Department
of Physics, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa,
Sakyo-ku, Kyoto, 605-8502, Japan
| | - Jun Yamamoto
- Department
of Physics, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa,
Sakyo-ku, Kyoto, 605-8502, Japan
| | - Atsushi Yoshizawa
- Department
of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, 036-8561, Japan
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Yang G, Han L, Jiang H, Zou G, Zhang Q, Zhang D, Wang P, Ming H. Enantioselective synthesis of helical polydiacetylenes in the visible light region. Chem Commun (Camb) 2014; 50:2338-40. [DOI: 10.1039/c3cc48478e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction between CPVL and the PDA oligomer was assumed to play a dominant role in the enantio-selective polymerization process.
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Affiliation(s)
- Guang Yang
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- Key Laboratory of Optoelectronic Science and Technology in Anhui Province
- University of Science and Technology of China
- Hefei, P. R. China
| | - Lu Han
- Department of Optics and Optical Engineering
- University of Science and Technology of China
- Hefei 230026, China
| | - Hao Jiang
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- Key Laboratory of Optoelectronic Science and Technology in Anhui Province
- University of Science and Technology of China
- Hefei, P. R. China
| | - Gang Zou
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- Key Laboratory of Optoelectronic Science and Technology in Anhui Province
- University of Science and Technology of China
- Hefei, P. R. China
| | - Qijin Zhang
- CAS Key Laboratory of Soft Matter Chemistry
- Department of Polymer Science and Engineering
- Key Laboratory of Optoelectronic Science and Technology in Anhui Province
- University of Science and Technology of China
- Hefei, P. R. China
| | - Douguo Zhang
- Department of Optics and Optical Engineering
- University of Science and Technology of China
- Hefei 230026, China
| | - Pei Wang
- Department of Optics and Optical Engineering
- University of Science and Technology of China
- Hefei 230026, China
| | - Hai Ming
- Department of Optics and Optical Engineering
- University of Science and Technology of China
- Hefei 230026, China
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