Photoinduced chirality in achiral liquid crystalline azobenzene polymers containing different polar side groups

Zheng, Zhi; Su, Zhiqiang; Wang, Lili; Xu, Jie; Zhang, Qijin

doi:10.1016/j.eurpolymj.2007.01.055

Cited by 18 publications

(9 citation statements)

References 29 publications

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“…A variety of azo-containing sidechain LCPs with different molecular structures have been prepared via various polymerization approaches. 1,3,4,6,7,[12][13][14][15][16][17][18][19][20][21][22] Systematic studies on the structure-property relationship of the azo-containing side-chain LCPs have revealed that both their phase transition behaviors and photoresponsive properties are strongly dependent on their polymer backbones, 13,14 the azo mesogens, [15][16][17][18] and the length of the flexible spacers. [19][20][21][22] Among these influencing factors, the molecular structures of the azo mesogens, especially the terminal substitutent of the azo groups, have been recognized as one of the most important primary factors influencing the properties of the azo polymers because the azo groups act as both the mesogenic and photoresponsive units and their substituents can have significant influence on the dipole moment of the azo chromophores and thus their phase transition and photoresponsive behaviors.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22] Among these influencing factors, the molecular structures of the azo mesogens, especially the terminal substitutent of the azo groups, have been recognized as one of the most important primary factors influencing the properties of the azo polymers because the azo groups act as both the mesogenic and photoresponsive units and their substituents can have significant influence on the dipole moment of the azo chromophores and thus their phase transition and photoresponsive behaviors. [15][16][17][18] Therefore, many side-chain LCPs bearing pendant azo mesogens with various substituents such as hydrogen, 23 alkyl, 24,25 perfluoroalkyl, 17 alkyloxy, 15,26,27 chiral alkyloxy, 21,28 nitro, 19,29,30 cyano, 31,32 carboxyl, 33 cinnamoyl, 34,35 and N-hydroxysuccinimide carboxylate groups 36 have been developed for different purposes.…”

Section: Introductionmentioning

confidence: 99%

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Photoresponsive side-chain liquid crystalline polymers with amide group-substituted azobenzene mesogens: effects of hydrogen bonding, flexible spacers, and terminal tails

Fang

Hou

et al. 2012

Soft Matter

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photoresponsive side-chain liquid crystalline polymers with amide group-substituted azobenzene mesogens: effects of hydrogen bonding, flexible spacers, and terminal tails

Fang

Hou

et al. 2012

Soft Matter

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“…Oriol et al made in-depth investigations on CPL-induced supramolecular chirality in achiral Azo-homopolymers/copolymers 29 [ 131 , 222 , 223 , 224 , 225 , 226 , 227 , 228 ]. Zhang et al systematically studied the effects of different spacers, the type of Azo chromophore and end groups on the CPL-induced chirality of achiral LC Azo-polymers 30 [ 229 , 230 ]. Many researchers have done a lot of works on CPL-induced supramolecular chirality and believed that CPL sense ( r or l ) can effectively control the chirality of achiral Azo-polymers.…”

Section: Supramolecular Chirality Of Azo-polymers Constructed By Pmentioning

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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“…Synthesis, purification and characterization of compounds 1, 2a, 2b were similar to our previous work 36 and the preparation and characterization of a series of CholXAzo are as follows.…”

Section: Synthesismentioning

confidence: 99%

Optically binary liquid crystalline blue phases induced by one-armed cholesterol-linked azobenzene molecules

Yin

Gao

et al. 2015

Soft Matter

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A series of one-armed cholesterol-linked azobenzene molecules named CholXAzo with different spacers were synthesized, in which Chol6Azo was found to have induced blue phases (BPs) with a concentration of 4.0 wt%. Under irradiation of 385 nm UV light with a density of 15.0 mW cm(-2), photo-responsive behaviour of the 4.0 wt% Chol6Azo doped sample named B3 shows a sensitive temperature dependence, which means that at 38.0 °C a phase transition from BPs to the isotropic phase is induced; however, at 33.0 °C, this phase transition does not take place. Results from the research show that the optically binary phase transition behaviour of B3 is sensitive to the isomerization degree of Chol6Azo, which is closely related to the stability of the BP structure and there is a critical isomerization degree of 13.7% for the phase transition of the B3 liquid crystals. Further POM observation shows that the liquid crystal samples doped with different concentrations of Chol6Azo have an increasing transition temperature for photo-induced phase transition from the BP to the isotropic phase along with the increasing concentration of Chol6Azo, which are found to have the same changing tendency with phase transition temperature from the isotropic phase to BPs and a phase diagram is made to map the optically binary behaviour of Chol6Azo doped blue phase liquid crystals. At last, a simple pattern with the BP and the isotropic phase arranged at an interval was made in this optically binary liquid crystalline blue phase under a suitable photomask.

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Photoinduced chirality in achiral liquid crystalline azobenzene polymers containing different polar side groups

Cited by 18 publications

References 29 publications

Photoresponsive side-chain liquid crystalline polymers with amide group-substituted azobenzene mesogens: effects of hydrogen bonding, flexible spacers, and terminal tails

Photoresponsive side-chain liquid crystalline polymers with amide group-substituted azobenzene mesogens: effects of hydrogen bonding, flexible spacers, and terminal tails

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

Optically binary liquid crystalline blue phases induced by one-armed cholesterol-linked azobenzene molecules

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