Self-assembling behaviour of chiral calamitic monoacrylates targeted for polymer stabilisation of polar smectic phases in chiral liquid crystals

Dmochowska, Ewelina; Herman, Jakub; Czerwiński, Michał; Stulov, Sergei; Bubnov, Alexej; Kula, Przemysław

doi:10.1016/j.molliq.2021.115723

Cited by 19 publications

(11 citation statements)

References 67 publications

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“…Liquid crystal (LC) phases represent a unique state of matter that possesses mobility and order on different macroscopic, supramolecular, and molecular levels. − The hierarchical molecular arrangement or self-assembly in liquid crystals provides a platform for developing various nanostructured materials. , Moreover, microsegregated molecular fragments, molecular shapes with various interactions, and self-organization are the essential key factors that have led to the stabilization of various LC phases . The distinguishing feature of having order and mobility in LC phases provides multiresponsive self-healing supramolecular systems, which have given rise to many devices that impact modern day life and also have become the subject of intense investigation. − Their application in low power consuming display devices has revolutionized industry and enhanced the human standard of living . Further, liquid crystal based biosensors are also widely utilized as diagnostic tools …”

Section: Introductionmentioning

confidence: 99%

“…It is noteworthy that the LC systems are formed within Scheme 18. Synthetic Route of Calix [4]resorcinarene and Calix [8] a wide concentration range of lanthanum ions. This is of high importance from the viewpoint of the template design of novel supramolecular materials with magnetic, luminescent, and catalytic activities.…”

Section: Yonetake Et Al Introduced Calix[4]mentioning

confidence: 99%

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Calixarene Functionalized Supramolecular Liquid Crystals and Their Diverse Applications

et al. 2022

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Liquid crystals are considered to be the fourth state of matter with an intermediate order and fluidity in comparison to solids and liquids. Calixarenes are among one of the most versatile families of building blocks for supramolecular chemistry due to their unique vaselike structure that can be chemically engineered to have different shapes and sizes. During the last few decades, calixarenes have drawn much attention in the field of supramolecular chemistry due to their diverse applications in the fields of ion and molecular recognition, ionselective electrodes for catalysis, drug delivery, gelation, organic electronics and sensors, etc. Imbuing liquid crystallinity to the calixarene framework leads to functionalized calixarene derivatives with fluidity and order. Columnar self-assembly of such derivatives in particular enhance the charge migration along the column due to the 1D stacking due to the enhanced π−π overlap. Considering limited reports and reviews on this new class of calixarene based liquid crystals, a comprehensive account of the synthesis of calixarene liquid crystals along with their mesomorphic behavior and potential applications are presented in this review.

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Section: Introductionmentioning

confidence: 99%

Section: Yonetake Et Al Introduced Calix[4]mentioning

confidence: 99%

Calixarene Functionalized Supramolecular Liquid Crystals and Their Diverse Applications

et al. 2022

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“…Utilisation of the various types of polymeric backbones (polyacrylate [ 16 ], polymethacrylate [ 4 , 21 , 22 , 24 ], polysiloxane [ 23 , 25 , 26 , 27 , 28 ], polyurethane [ 29 ], etc.) for the design of LC macromolecular materials requires a specific molecular structure of the reactive terminal groups (acrylate [ 16 , 30 , 31 , 32 , 33 ], methacrylate [ 4 , 21 , 22 , 32 ], vinyl [ 12 , 23 , 27 , 34 ], thiols [ 35 , 36 , 37 ], etc.) of the respective monomeric LC materials used as functional reactive mesogens.…”

Section: Introductionmentioning

confidence: 99%

Design and Self-Assembling Behaviour of Calamitic Reactive Mesogens with Lateral Methyl and Methoxy Substituents and Vinyl Terminal Group

Bubnov

Cigl

Penkov³

et al. 2021

Polymers

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Smart self-organising systems attract considerable attention in the scientific community. In order to control and stabilise the liquid crystalline behaviour, and hence the self-organisation, the polymerisation process can be effectively used. Mesogenic units incorporated into the backbones as functional side chains of weakly cross-linked macromolecules can become orientationally ordered. Several new calamitic reactive mesogens possessing the vinyl terminal group with varying flexible chain lengths and with/without lateral substitution by the methyl (methoxy) groups have been designed and studied. Depending on the molecular structure, namely, the type and position of the lateral substituents, the resulting materials form the nematic, the orthogonal SmA and the tilted SmC phases in a reasonably broad temperature range, and the structure of the mesophases was confirmed by X-ray diffraction experiments. The main objective of this work is to contribute to better understanding of the molecular structure–mesomorphic property relationship for new functional reactive mesogens, aiming at further design of smart self-assembling macromolecular materials for novel sensor systems.

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“…E - Z isomerization of azobenzene groups results in significant changes of their molecular shape and polarity, which may cause significant structural changes of self-organization. These changes can have a strong impact on phase transitions, − wettability and surface tension modification, − and photoactuation phenomena. − The potential applicability of the LCP materials is strongly correlated with the major materials’ characteristics and properties that are radically dependent on the molecular structure. − …”

Section: Introductionmentioning

confidence: 99%

Photo-orientation Processes in Liquid Crystalline Polymethacrylates with Side Azobenzene Groups Having Lateral Methyl Substituents

et al. 2021

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Design of new photoactive materials exhibiting nano-organization aiming for smart practical applications remains an actual and highlighted task. The synthesis and comparative study of chiral liquid crystalline polymethacrylates with azobenzene groups having lateral methyl substituents were carried out to contribute to a better understanding of their structure−property relationship. The synthesized polymers possess the same photochromic fragment and differ in the length of the spacer (m) and the terminal chiral group (n, 6 and 10 methylene units). Racemic analogues of the chiral polymethacrylates were also synthesized and studied. The effects of chirality and length of the spacer of the terminal alkyl groups on the mesomorphic behavior and photo-optical properties were established. Depending on the chemical structure of the variable fragments and chirality, the polymers exhibit the nematic, the cholesteric, the orthogonal smectic A, and other smectic phases. The presence of the lateral methyl substituent in the photochrome/mesogen fragment leads to a significant decrease in isotropization temperature compared with the same azobenzene-containing polymers without lateral substitution. The photoorientation processes under illumination with polarized visible light (457 nm) are studied for the amorphousized films of the investigated liquid crystalline polymethacrylates. It was found that an increase in the spacer length leads to an increase in the value of photoinduced dichroism (ΔD = 0.28). The maximal photoinduced dichroism is independent of the length of the terminal chiral group. The maximal dichroism (D = 0.78) under polarized visible light irradiation is found for the polymers with m = 10 and n = 6. Upon annealing the irradiated polymer films at room temperature, a reversible change in the dichroism value was observed. Chirality plays a significant role in the relaxation behavior of the irradiated enantiopure and racemic films of polymers with a long spacer and alkyl tail (10 methylene units).

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Self-assembling behaviour of chiral calamitic monoacrylates targeted for polymer stabilisation of polar smectic phases in chiral liquid crystals

Cited by 19 publications

References 67 publications

Calixarene Functionalized Supramolecular Liquid Crystals and Their Diverse Applications

Calixarene Functionalized Supramolecular Liquid Crystals and Their Diverse Applications

Design and Self-Assembling Behaviour of Calamitic Reactive Mesogens with Lateral Methyl and Methoxy Substituents and Vinyl Terminal Group

Photo-orientation Processes in Liquid Crystalline Polymethacrylates with Side Azobenzene Groups Having Lateral Methyl Substituents

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