Different phase-dominated chiral assembly of polyfluorenes induced by chiral solvation: axial and supramolecular chirality

Li, Shuai; Miao, Tengfei; Cheng, Xiaoxiao; Zhao, Yin; Zhang, Wei; Zhu, Xiulin

doi:10.1039/c9ra08354e

Cited by 16 publications

(8 citation statements)

References 53 publications

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“…CD spectroscopy is the most commonly used and effective method for characterizing supramolecular chirality. [79][80][81][82] The CD graph is drawn by taking the wavelength λ as the abscissa and the difference in absorption coefficient Δε = (ε L − ε R ) as the ordinate. The resulting spectrum is the circular dichroic spectrum.…”

Section: Supramolecular Chirality In Polymer Aggregatesmentioning

confidence: 99%

Supramolecular chiral polymeric aggregates: Construction and applications

et al. 2022

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Inspired by the mystery of natural homochirality, the design and construction of artificial chiral systems with special functions including mechanics, chiroptical devices, and chiral separation have aroused the great interest of scientists. Due to its diverse conformations and components, polymers become an excellent candidate to construct artificial chiral aggregates, which provides an opportunity to fabricate advanced chiral materials. Herein, in this review, we summarized not only the different strategies for construction and regulation of supramolecular chirality in chiral or achiral polymer systems, mainly including post-assembly and polymerizationinduced chiral self-assembly in chiral polymer systems and several chirality transfer and induction strategies in achiral polymer systems, but also the formation mechanisms of chiral aggregates by the chirality amplification from the molecular level to supramolecular level. Furthermore, we present the typical applications of chiral polymeric aggregates in circularly polarized light emission, chiral recognition and separation, and chiral elastomer. Finally, the current challenges and future directions of chiral polymeric aggregates are also elaborated. K E Y W O R D S aggregates, chiral applications, chiral assembly, chirality, polymers INTRODUCTION OF CHIRALITY Chirality in diverse scalesIn nature, chiral structures are widespread at various hierarchical levels, such as the chiral amino acid molecules, the double-helical structure of DNA biomacromolecules, the helical shape of bacterial flagella, and even the visible plant cane and galaxy (Figure 1). [1,2] Scientists have also been working on mimicking helical phenomena in nature and exploring the mechanism of chiral information transfer and amplification, so as to reveal the origin of life and develop advanced functional materials. [3][4][5][6] According to the assembling structures of chiral substances at the molecular level and above, chirality can generally be divided into molecular chirality, supramolecular chirality, and macrochirality, which isThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Supramolecular Chirality In Polymer Aggregatesmentioning

confidence: 99%

Supramolecular chiral polymeric aggregates: Construction and applications

et al. 2022

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“…When achiral guests interact with chiral hosts, chiral information from chiral sources can be transferred to the achiral systems to form supramolecular chiral assemblies. Many chiral sources have been extensively studied including CPL [ 69 , 70 ], chiral additives [ 71 , 72 , 73 ], chiral solvents [ 74 , 75 , 76 , 77 , 78 ], chiral gelators [ 79 , 80 , 81 ], DNA [ 82 ], or chiral nanostructures [ 83 , 84 , 85 , 86 ].…”

Section: Basic Concepts Related To Supramolecular Chiralitymentioning

confidence: 99%

Supramolecular Chirality in Azobenzene-Containing Polymer System: Traditional Postpolymerization Self-Assembly Versus In Situ Supramolecular Self-Assembly Strategy

Cheng

Miao

Qian

et al. 2020

IJMS

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Recently, the design of novel supramolecular chiral materials has received a great deal of attention due to rapid developments in the fields of supramolecular chemistry and molecular self-assembly. Supramolecular chirality has been widely introduced to polymers containing photoresponsive azobenzene groups. On the one hand, supramolecular chiral structures of azobenzene-containing polymers (Azo-polymers) can be produced by nonsymmetric arrangement of Azo units through noncovalent interactions. On the other hand, the reversibility of the photoisomerization also allows for the control of the supramolecular organization of the Azo moieties within polymer structures. The construction of supramolecular chirality in Azo-polymeric self-assembled system is highly important for further developments in this field from both academic and practical points of view. The postpolymerization self-assembly strategy is one of the traditional strategies for mainly constructing supramolecular chirality in Azo-polymers. The in situ supramolecular self-assembly mediated by polymerization-induced self-assembly (PISA) is a facile one-pot approach for the construction of well-defined supramolecular chirality during polymerization process. In this review, we focus on a discussion of supramolecular chirality of Azo-polymer systems constructed by traditional postpolymerization self-assembly and PISA-mediated in situ supramolecular self-assembly. Furthermore, we will also summarize the basic concepts, seminal studies, recent trends, and perspectives in the constructions and applications of supramolecular chirality based on Azo-polymers with the hope to advance the development of supramolecular chirality in chemistry.

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“…[29,30,36] It has previously been shown that chirality can be induced into β-phase PFO solution aggregates through control of the heating/cooling rate, solvent, and solution concentration. [39,40] Despite these exciting observations, the induction of chiroptically active β-phase (hereafter "chiral β-phase") domains into thin PFO films has not been previously reported, which lies central to the realization of high-performance CP-emitting PFO devices operational in the deep-blue spectral region. Here, we show that the chiral small molecule 1-aza [6]helicene (aza [6]H) can induce a chiral phase in crystalline PFO (circular dichroism, CD ≈ −10 800 mdeg) upon TA (T = 160 °C).…”

Section: Introductionmentioning

confidence: 99%

Strongly Circularly Polarized Crystalline and β‐Phase Emission from Poly(9,9‐dioctylfluorene)‐Based Deep‐Blue Light‐Emitting Diodes

Wan

Shi

Wade

et al. 2021

Advanced Optical Materials

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A key challenge in the realization of circularly polarized polymer light‐emitting diodes (CP‐PLEDs) is the generation of highly circularly polarized deep‐blue electroluminescence (EL). Here, by blending the achiral luminescent polymer poly(9,9‐dioctylfluorene) (PFO) with a helically chiral molecule 1‐aza[6]helicene the authors present CP‐PLEDs with state‐of‐the‐art device performance for deep‐blue CP emission: for an inverted device with a semicrystalline microstructure a current efficiency (CE) of 1.13 cd A−1, a power efficiency (PE) of 0.81 lm W−1, and an EL dissymmetry (gEL) of −0.42 are achieved; for the planarized and extended “β‐phase” chain conformation a CE of 1.23 cd A−1, a PE of 0.63 lm W−1, and a gEL of −0.44 are achieved. While these two phases achieve both high CE, as well as gEL, the latter affords the first demonstration of chiral β‐phase emission from solid‐state PFO devices. Such strongly circularly polarized light is generated from a supramolecular assembly of interacting planar polymer backbones. The authors rationalize that the strong chiroptical effects observed within such chiral β‐phase PFO domains originate from coupled interchain aggregates. The findings not only demonstrate efficient deep‐blue CP‐PLEDs, but also provide insight into the mechanisms that underpin the strong CP emission from excitonically coupled polymer chains.

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Different phase-dominated chiral assembly of polyfluorenes induced by chiral solvation: axial and supramolecular chirality

Abstract: The chiral solvation induced chirality in achiral polyfluorenes showed the axial chirality for PF2/6 with branched side alkyl chain, but supramolecular chirality for PF8 with linear side alkyl chain.

Cited by 16 publications

References 53 publications

Supramolecular chiral polymeric aggregates: Construction and applications

Supramolecular chiral polymeric aggregates: Construction and applications

Supramolecular Chirality in Azobenzene-Containing Polymer System: Traditional Postpolymerization Self-Assembly Versus In Situ Supramolecular Self-Assembly Strategy

Strongly Circularly Polarized Crystalline and β‐Phase Emission from Poly(9,9‐dioctylfluorene)‐Based Deep‐Blue Light‐Emitting Diodes

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