Photoinduction and Control of the Supramolecular Chirality in Liquid Crystalline Azomaterials

Tejedor, Rosa M.; Vera, Francisco; Oriol, Luis; Sierra, Teresa; Serrano, José Luís

doi:10.1080/15421400802219767

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…The formation of propeller-shaped tetrameric units by hydrogen bonding between melamine derivatives and V-shaped molecules 214 (Scheme ) with the carboxylic acid group have been observed. − These supramolecular entities are found to exhibit columnar LC phases with intracolumnar helical dispositions. Induction of supramolecular chirality in columnar LC phases of azobenzene-containing compounds have been achieved by irradiation with CPL.…”

Section: Photomodulation Of Chiral Liquid Crystalsmentioning

confidence: 99%

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Light-Driven Liquid Crystalline Materials: From Photo-Induced Phase Transitions and Property Modulations to Applications

2016

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Light-driven phenomena both in living systems and nonliving materials have enabled truly fascinating and incredible dynamic architectures with terrific forms and functions. Recently, liquid crystalline materials endowed with photoresponsive capability have emerged as enticing systems. In this Review, we focus on the developments of light-driven liquid crystalline materials containing photochromic components over the past decade. Design and synthesis of photochromic liquid crystals (LCs), photoinduced phase transitions in LC, and photoalignment and photoorientation of LCs have been covered. Photomodulation of pitch, polarization, lattice constant and handedness inversion of chiral LCs is discussed. Light-driven phenomena and properties of liquid crystalline polymers, elastomers, and networks have also been analyzed. The applications of photoinduced phase transitions, photoalignment, photomodulation of chiral LCs, and photomobile polymers have been highlighted wherever appropriate. The combination of photochromism, liquid crystallinity, and fabrication techniques has enabled some fascinating functional materials which can be driven by ultraviolet, visible, and infrared light irradiation. Nanoscale particles have been incorporated to widen and diversify the scope of the light-driven liquid crystalline materials. The developed materials possess huge potential for applications in optics, photonics, adaptive materials, nanotechnology, etc. The challenges and opportunities in this area are discussed at the end of the Review.

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Section: Photomodulation Of Chiral Liquid Crystalsmentioning

confidence: 99%

“…They have elaborated on the application of CPL as a chiral stimulus for the formation, modification, and control of supramolecular chiral organizations based on azo-containing materials. 585 The handedness of propeller-like hydrogen-bonded complexes can be controlled with CPL irradiation.…”

Section: Light-driven Chiral Induction In Liquid Crystalsmentioning

confidence: 99%

Light-Driven Liquid Crystalline Materials: From Photo-Induced Phase Transitions and Property Modulations to Applications

2016

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“…In 2004, they found that circular dichroism of Azo-copolymer 28 can be induced by CPL due to the cooperative motion between Azo units and nonphotoactive mesogens during the process of supramolecular self-assembly. 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 ].…”

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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“…Liquid crystals are versatile materials for applications . The incorporation of liquid crystals in photoresponsive devices (for optical data storage, photomechanics, or nonlinear optics) is one of the main applications, and several recent reviews on this topic can be found . In order to display functions, the liquid crystal has to contain entities able to react to luminous stimuli.…”

Section: Introductionmentioning

confidence: 99%

Photoisomerizable Metallomesogens and Soft Crystals Based on Orthopalladated Complexes

et al. 2010

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With the aim of obtaining light-responsive liquid-crystalline palladium complexes, six palladium complexes derived from an orthometalated imine, bearing one or two azocarboxylato bridges, have been synthesized: [Pd(2)(μ-SC(10)H(21))(μ-O(2)CAzo)(L(1,2))(2)] (7 and 8), [Pd(2)(μ-SC(10)H(21))(μ-O(2)CAzo3C(10))(L(1,2))(2)] (9 and 10), [Pd(μ-O(2)CAzo)L(1)](2) (11), and [Pd(μ-O(2)CAzo3C(10))L(1)](2) (12), in which L(1) = p-H(21)C(10)OC(6)H(3)CH═NC(6)H(4)OC(10)H(21)-p, L(2) = p-H(21)C(10)OC(6)H(3)CH═NC(14)H(29), AzoCO(2)(-) = p-(phenylazo)benzoate, and Azo3C(10)CO(2)(-) = p-(2',3',4'-tris-n-decyloxyphenylazo)benzoate. Three of them (7-9), as well as the precursor Azo3C(10)CO(2)H (3), are thermotropic liquid crystals displaying nematic and smectic A mesophases, while 10-12 have been identified by X-ray diffraction to give rise to "soft" crystal phases. Electronic spectroscopy and (1)H NMR show that all of them undergo a trans-cis isomerization of the azobenzene moiety at λ = 365 nm. The molecular structure determines the photoresponse in solution, which is faster and more stable when the trisubstituted azocarboxylate is present and the motion of the azo group is not hindered by the orthometalated imine. The photoresponse has also been observed in the condensed phases, which change from the ordered phase to the isotropic liquid upon irradiation, except for compound 10, a soft crystal in which a permanent photoalignment highly sensitive to light polarization is produced. The latter is a behavior with potential applications, rather unusual in low-molecular-weight compounds.

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Photoinduction and Control of the Supramolecular Chirality in Liquid Crystalline Azomaterials

Cited by 7 publications

References 31 publications

Light-Driven Liquid Crystalline Materials: From Photo-Induced Phase Transitions and Property Modulations to Applications

Light-Driven Liquid Crystalline Materials: From Photo-Induced Phase Transitions and Property Modulations to Applications

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

Photoisomerizable Metallomesogens and Soft Crystals Based on Orthopalladated Complexes

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