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Jin Q, Chen S, Sang Y, Guo H, Dong S, Han J, Chen W, Yang X, Li F, Duan P. Circularly polarized luminescence of achiral open-shell π-radicals. Chem Commun (Camb) 2019; 55:6583-6586. [DOI: 10.1039/c9cc03281a] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Doublet emission-based circularly polarized luminescence was successfully realized in luminescent π-radicals by applying three kinds of approaches, namely, induction by a longitudinal magnetic field, supramolecular chiral co-assembly, and doping into chiral liquid crystals.
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Gao X, Qin X, Yang X, Li Y, Duan P. (R)-Binaphthyl derivatives as chiral dopants: substituent position controlled circularly polarized luminescence in liquid crystals. Chem Commun (Camb) 2019; 55:5914-5917. [DOI: 10.1039/c9cc02253h] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral liquid crystals (N*-LCs) induced by binaphthyl derivatives which have the same (R)-configuration exhibited opposite circularly polarized luminescence.
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Affiliation(s)
- Xiaohui Gao
- College of Chemistry and Chemical Engineering
- Xi’an University of Science and Technology
- Xi’an 710054
- P. R. China
- CAS Center for Excellence in Nanoscience
| | - Xujin Qin
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication
- Division of Nanophotonics
- National Center for Nanoscience and Technology (NCNST)
- Beijing 100190
| | - Xuefeng Yang
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication
- Division of Nanophotonics
- National Center for Nanoscience and Technology (NCNST)
- Beijing 100190
| | - Yuangang Li
- College of Chemistry and Chemical Engineering
- Xi’an University of Science and Technology
- Xi’an 710054
- P. R. China
| | - Pengfei Duan
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication
- Division of Nanophotonics
- National Center for Nanoscience and Technology (NCNST)
- Beijing 100190
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Caricato M, Sharma AK, Coluccini C, Pasini D. Nanostructuring with chirality: binaphthyl-based synthons for the production of functional oriented nanomaterials. NANOSCALE 2014; 6:7165-7174. [PMID: 24848159 DOI: 10.1039/c4nr00801d] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Chirality is a powerful tool for the generation of order, directionality, and, as such, of function, in assembled nanoscale chemical devices. Axially chiral binaphthyls have been widely used in organic synthesis; the stability of the enantiomers enables their use as robust chirality inducers and catalysts in asymmetric reactions, and they are nowadays industrially applied in a variety of organic transformations. Applications of these compounds in the field of nanosciences are more recent, and not yet fully explored. The integration of such a robust class of chiral compounds, capable of efficient transfer of stereochemical information, into functional aggregates and nanoarchitectures is of great current interest. We will discuss preeminent examples of applications of these synthons in several fields of nanoscience, such as reticular chemistry, non-linear optical materials and imaging, and liquid crystals.
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Affiliation(s)
- Marco Caricato
- Department of Chemistry, University of Pavia, Viale Taramelli 10, 27100 Pavia, Italy.
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Frezza E, Pieraccini S, Mazzini S, Ferrarini A, Spada GP. The interplay of configuration and conformation in helical perylenequinones: Insights from chirality induction in liquid crystals and calculations. Beilstein J Org Chem 2012; 8:155-63. [PMID: 22423282 PMCID: PMC3302075 DOI: 10.3762/bjoc.8.16] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 12/30/2011] [Indexed: 11/23/2022] Open
Abstract
The chirality transfer in liquid crystals induced by two helical perylenequinones (namely, the natural compounds cercosporin and phleichrome) was investigated by integrating measurements of helical twisting power with a conformational analysis by DFT calculations and with the prediction of their twisting ability by the surface-chirality method. The two quasi-enantiomeric derivatives induce oppositely handed cholesteric phases when introduced as dopants in nematic solvents. We evaluated the role of the different conformations of the chiral hydroxyalkyl side chains in determining the helical twisting power: They were found to affect the strength of the chirality transfer, although the handedness of the induced cholesteric phase is essentially determined by the axial chirality (helicity) of the core of the perylenequinones.
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Affiliation(s)
- Elisa Frezza
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Silvia Pieraccini
- Dipartimento di Chimica Organica “A. Mangini”, Alma Mater Studiorum – Università di Bologna, via San Giacomo 11, 40126 Bologna, Italy
| | - Stefania Mazzini
- Dipartimento di Scienze Molecolari Agroalimentari, Università degli Studi di Milano, via Celoria 2, 20133 Milano, Italy
| | - Alberta Ferrarini
- Department of Chemical Sciences, University of Padova, via Marzolo 1, 35131 Padova, Italy
| | - Gian Piero Spada
- Dipartimento di Chimica Organica “A. Mangini”, Alma Mater Studiorum – Università di Bologna, via San Giacomo 11, 40126 Bologna, Italy
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Wu YL, Ferroni F, Pieraccini S, Schweizer WB, Frank BB, Spada GP, Diederich F. 1,2-Di(phenylethynyl)ethenes with axially chiral, 2,2′-bridged 1,1′-binaphthyl substituents: potent cholesteric liquid-crystal inducers. Org Biomol Chem 2012; 10:8016-26. [DOI: 10.1039/c2ob25983d] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Goh M, Park J, Han Y, Ahn S, Akagi K. Chirality transfer from atropisomeric chiral inducers to nematic and smectic liquid crystals – synthesis and characterization of di- and tetra-substituted axially chiral binaphthyl derivatives. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm35282f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ferrarini A, Ferroni F, Pieraccini S, Rosini C, Superchi S, Spada GP. Central-to-axial chirality transfer revealed by liquid crystals: A combined experimental and computational approach for the determination of absolute configuration of carboxylic acids with an α chirality centre. Chirality 2011; 23:736-43. [DOI: 10.1002/chir.20969] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Synthesis and conformation of substituted chiral binaphthyl-azobenzene cyclic dyads with chiroptical switching capabilities. Molecules 2011; 16:1603-24. [PMID: 21321531 PMCID: PMC6259615 DOI: 10.3390/molecules16021603] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 02/02/2011] [Accepted: 02/11/2011] [Indexed: 11/16/2022] Open
Abstract
Optically active binaphthyl-azobenezene cyclic dyads were synthesized to develop a photochromic switching molecule. Azobenezene moieties were cis-trans isomerized by photoirradiation. As a reflection of the structural change, the specific optical rotation and circular dichroism underwent significant shifts. Under certain conditions, the positive-negative and zero-positive (or zero-negative) signals were reversed. Optical rotation may potentially be applied in noise-cancelling nondestructive photoswiches. The conformations were studied by experimental and theoretical methods. The results revealed that the helical chirality, (P) or (M), of the cis-azobenzene moiety was induced by intramolecular axial chirality. The twist direction depended on the axial chirality as well as the azobenzene linkage position to the binaphthyls, but was independent of the identity of substituted groups. 2,2’-Linked-(R)-binaphthyl was found to induce cis-(P)-azobenzene, whereas symmetrically 7,7’-linked-(R)-binaphthyl was found to induce cis-(M)-azobenzene.
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Takaishi K, Kawamoto M, Tsubaki K, Furuyama T, Muranaka A, Uchiyama M. Helical Chirality of Azobenzenes Induced by an Intramolecular Chiral Axis and Potential as Chiroptical Switches. Chemistry 2011; 17:1778-82. [DOI: 10.1002/chem.201003087] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Indexed: 11/09/2022]
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Ferrarini A, Pieraccini S, Masiero S, Spada GP. Chiral amplification in a cyanobiphenyl nematic liquid crystal doped with helicene-like derivatives. Beilstein J Org Chem 2009; 5:50. [PMID: 19936270 PMCID: PMC2779693 DOI: 10.3762/bjoc.5.50] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2009] [Accepted: 10/02/2009] [Indexed: 11/23/2022] Open
Abstract
The addition of a chiral non-racemic dopant to a nematic liquid crystal (LC) has the effect of transferring the molecular chirality to the phase organization and a chiral nematic phase is formed. This molecular chirality amplification in the LC provides a unique possibility for investigating the relationship between molecular structure, intermolecular interactions, and mesoscale organization. It is known that axially chiral or helical-shaped molecules with reduced conformational disorder are good candidates for high helical twisting power derivatives. In particular, biaryl derivatives are known to be efficient chiral inducers in biaryl nematic mesophases. In this paper, we focus on a new series of helicene-like molecules of known absolute configuration. We have integrated cholesteric pitch measurements with geometry optimization by DFT calculations and analysis of the twisting ability by the Surface Chirality model to shed light on the structural features responsible for the analogies and differences exhibited by these derivatives. The investigation of these dopants with well-defined geometry, by virtue of the low conformational freedom, and the substituents variously distributed around the core, allows us to extend our knowledge of the molecular origin of the chirality amplification in liquid crystals and to confirm the simple relationship “molecular P-helicity” → “cholesteric P-handedness” for helical-shaped helicene-like derivatives.
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Affiliation(s)
- Alberta Ferrarini
- Dipartimento di Scienze Chimiche, Università di Padova, 35131 Padova, Italy.
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Frank B, Camafort Blanco B, Jakob S, Ferroni F, Pieraccini S, Ferrarini A, Boudon C, Gisselbrecht JP, Seiler P, Spada GP, Diederich F. N-Arylated 3,5-Dihydro-4H-dinaphtho[2,1-c:1′,2′-e]azepines: Axially Chiral Donors with High Helical Twisting Powers for Nonplanar Push-Pull Chromophores. Chemistry 2009; 15:9005-16. [DOI: 10.1002/chem.200900913] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Takaishi K, Kawamoto M, Tsubaki K, Wada T. Photoswitching of Dextro/Levo Rotation with Axially Chiral Binaphthyls Linked to an Azobenzene. J Org Chem 2009; 74:5723-6. [DOI: 10.1021/jo901030s] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazuto Takaishi
- Supramolecular Science Laboratory, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
| | - Masuki Kawamoto
- Supramolecular Science Laboratory, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
| | - Kazunori Tsubaki
- Graduate School of Life and Environmental Science, Kyoto Prefectural University, Shimogamo Hangi-cho, Sakyo, Kyoto 606-8522, Japan
| | - Tatsuo Wada
- Supramolecular Science Laboratory, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
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Yoshizawa A, Kogawa Y, Kobayashi K, Takanishi Y, Yamamoto J. A binaphthyl derivative with a wide temperature range of a blue phase. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b902898f] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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