Pyrimidine-based ferroelectric mixtures – The influence of oligophenyl based chiral doping system

Czerwiński, Michał; Gaładyk, Katarzyna; Morawiak, Przemysław; Piecek, Wiktor; Chrunik, M.; Kurp, Katarzyna; Kula, Przemysław; Jaroszewicz, Leszek R.

doi:10.1016/j.molliq.2020.112693

Cited by 17 publications

(8 citation statements)

References 81 publications

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“…From the obtained results [37], many interesting conclusions regarding the influence of the chiral dopants structure on the properties of final multicomponent FLC mixtures can be highlighted. Some of the physicochemical and electro-optical parameters of prepared mixtures described in Ref.…”

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confidence: 89%

“…In order to obtain FLCs material according to the idea of doping achiral mixture with chiral dopant, the bicyclic pyrimidine compounds with alkyl or/and alkoxy terminal chain (based on a general structure 1, where: R 1 and R 2 are C n H 2n+1 -or C n H 2n+1 O-; n = 4 ÷11) were chosen and an achiral base mixture (denoted here as W) was prepared [37].…”

Section: Flcs Prepared From Achiral Smc Basic Mixture and Chiral Dopantsmentioning

confidence: 99%

“…Different electro-optical modes can be successfully used for these applications: (i) Surface Stabilized (SS) FLC [26,27]; (ii) Deformed Helix (DH) FLC [28][29][30]; (iii) Electrically Suppressed Helix (ESH) of FLC [29]; (iv) modulation of light in the diffraction FLC grating [31]; (v) orientational electro-optical Kerr effect [32,33] and others. This mini-review summarises results on recently prepared ferroelectric liquid crystalline materials and their multicomponent mixtures [34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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New Ferroelectric Liquid Crystalline Materials with Properties Suitable for Surface Stabilized and Deformed Helix Effects

Czerwiński¹,

Tykarska²,

Kula³

2021

Liq. Cryst. and their Appl.

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Liquid crystals (LC) are widely used in optical devices. New electro-optic effects are still being established. The requirements of such devices increases thus still new materials are elaborated for such purpose. In this review, two electro-optic effects are described, namely Surface Stabilized Ferroelectric LC (SSFLC) and Deformed Helix Ferroelectric LC (DHFLC) effects. New ferroelectric liquid crystal mixtures were formulated which can be used in devices operating on the basis of the mentioned electro-optic effects. Two ways of mixture preparation have been used: mixing of chiral components or mixing of achiral components with addition of a small amount of chiral dopant. The ferroelectric mixtures with very short (less than 200 nm) or very long (more than 1 μm) pitches are discussed. The mixtures meet almost all requirements of SSFLC and DHFLC effects and therefore, have important prospects for applications in optical sensors.

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mentioning

confidence: 89%

Section: Flcs Prepared From Achiral Smc Basic Mixture and Chiral Dopantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New Ferroelectric Liquid Crystalline Materials with Properties Suitable for Surface Stabilized and Deformed Helix Effects

Czerwiński¹,

Tykarska²,

Kula³

2021

Liq. Cryst. and their Appl.

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“…However, each part of the reactive mesogen molecule, namely the molecular core, type and position of the lateral substitution, linkage groups, length and type of the flexible chains, etc., can significantly change the resulting self-assembling behaviour of the designed material. The methyl [ 10 , 22 , 38 , 39 ] and methoxy [ 39 , 40 , 41 ] groups and halogen atoms [ 38 , 42 ], namely fluorine [ 42 , 43 , 44 , 45 , 46 , 47 ], chlorine [ 38 , 41 , 42 , 46 , 48 , 49 ], bromine [ 38 , 43 ] and iodine [ 50 ], are the most widely used and successful types of lateral substituents utilised for the effective tuning of the self-assembling behaviour, especially for the non-chiral and chiral calamitic LC materials. The type and position of the lateral substituents on the molecular core always drastically change the liquid crystalline behaviour of the resulting LC material when compared with its non-substituted analogue [ 38 , 39 ].…”

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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“…Lateral substitution as effective tool for tuning self-organising behaviour of chiral mesogens ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ However, during last decades of intense research, it has been shown that to reach the desired specific mesomorphic and electro-optical properties in a single molecular structure is almost impossible. This problem can be solved by the design of binary and multicomponent mixtures composed by structurally similar [7][8][9][10] or structurally different [11][12][13][14] molecules mixed-up in a definite quantity. Incorporation of various polymerisable groups, for example vinyl [15][16], acrylate [17][18][19][20][21], methacrylate [22][23][24], or various functional photoactive moieties (azo group [16][17], cinnamoyl group [27], hydrazone [28], spiropyrane [29], etc.)…”

Section: Introductionmentioning

confidence: 99%

Lateral Substitution as Effective Tool for Tuning Self-Organising Behaviour of Chiral Mesogens

Hamplová¹,

Mironov²,

Cigl³

et al. 2021

Liq. Cryst. and their Appl.

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Thermotropic liquid crystals belong to an exciting class of self-organising materials, which are broadly utilised now, and, definitely will find advanced applications in future. The combination of fluidity and ordering together with specific electro-optical properties assures their extraordinary practical usefulness. However, the molecular structure -mesomorphic property relationship is still far to be well-established and understood despite more than a hundred years of their existence and intensive study. The design, synthesis and investigation of new liquid crystalline materials with various molecular structure type (rod-like, bend-shaped, disc-like, etc.) and weight (low molar mass, macromolecular) still remain an actual and highlighted task. In this mini-review we discuss relatively broad sub-class of chiral calamitic liquid crystalline materials derived from the lactic acid and give some specific examples on effective tuning of their mesomorphic and electro-optical behaviour using various types of lateral substitution of molecular core. Fluorine, chlorine, bromine and iodine atoms, as well as bulky methyl and methoxy groups are used as lateral substituents on the phenyl ring far from the chiral lactate group. The materials discussed in this work can be potentially used as smart dopants for design of advanced multicomponent mixtures targeted for future applications in opto-electronics and photonics.

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Pyrimidine-based ferroelectric mixtures – The influence of oligophenyl based chiral doping system

Cited by 17 publications

References 81 publications

New Ferroelectric Liquid Crystalline Materials with Properties Suitable for Surface Stabilized and Deformed Helix Effects

New Ferroelectric Liquid Crystalline Materials with Properties Suitable for Surface Stabilized and Deformed Helix Effects

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

Lateral Substitution as Effective Tool for Tuning Self-Organising Behaviour of Chiral Mesogens

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