Ferroelectric Smectic C* Phase with Sub-Wavelength Helix Pitch Induced in a Nematic Liquid Crystal by Chiral Non-Mesogenic Dopants

Pozhidaev, E. P.; Torgova, S. I.; Будынина, Екатерина М.; Tkachenko, T. P.; Kuznetsov, A. V.; Barbashov, Vadim A.

doi:10.18083/lcappl.2020.3.26

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…Investigation of both FLC mixtures parameters: helix pitch p 0 , spontaneous polarization P s and tilt angle θ were carried out according to the described methods [8]. The electro-optical response shape of electro-optical cells based on FLC mixtures was recorded using RIGOL DS 1054 oscilloscope and evaluated by the Origin-2018 software.…”

Section: IIImentioning

confidence: 99%

“…The phenyl and biphenyl pyrimidine derivatives were often used as achiral matrix for creation of FLC mixtures [7][8][9][10][11]. There are described biphenyl pyrimidines with optically active substituents, which have a wide smectic C* phase temperature range, a high spontaneous polarisation (P s ) i.e., 500 nC/cm 2 , and can be used as chiral dopants to achiral matrices [12].…”

Section: Introductionmentioning

confidence: 99%

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Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures

Будынина¹,

Torgova²,

Kuznetsov³

et al. 2022

Liq. Cryst. and their Appl.

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The results of the synthesis and study of a new fluorinated achiral smectic C liquid crystal, namely, 2-(3-fluoro-4'-pentylbiphenyl-4-yl)-5-hexylpyrimidine, are presented. The possibility to use this compound as a matrix for ferroelectric liquid crystal (FLC) mixtures is evaluated. Two mixtures have been prepared: one (FLC-691-F) is based on new fluorinated compound and another (FLC-691) on its non-fluorinated analogue. The diester of optically active 2-octanol and terphenyldicarboxylic acid was used as a chiral dopant for both mixtures. Investigation of these FLC mixtures parameters: phase transition temperatures, helix pitch, spontaneous polarization and tilt angle show significant influence of fluorine atom. When comparing the phase sequence of FLC-691 and FLC-691-F mixtures, one can note that in the fluorine containing mixture an additional smectic A phase arises. At the same temperatures, the helix pitch of FLC-691-F is 2 – 2.5 times less than the helix pitch of FLC-691. The tilt angle of FLC-691-F is much smaller than that of FLC-691 but its value approaches the optimal value of 22.5 degrees, which ensures maximum light transmittance of electro-optical cells. At the same time the presence of fluorine atom in the matrix is a reason for the decrease of the mixture spontaneous polarization and a significant decrease (almost 4 times) in the driving voltage of electro-optical light shutters. As a result, it was shown that the fluorinated matrix provides new possibilities for controlling the mixture parameters.

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Section: IIImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures

Будынина¹,

Torgova²,

Kuznetsov³

et al. 2022

Liq. Cryst. and their Appl.

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“…Terphenyldicarboxylic acid derivatives are promising molecules for possible application as liquid crystals; in particular, a smectic phase has been reported (Pozhidaev et al, 2020(Pozhidaev et al, , 2019Budynina et al, 2022). Another important application of terphenyldicarboxylic acid is as a linking molecule in metalorganic frameworks (MOFs) (Dickie et al, 2006;Schaate et al, 2011;Luo et al, 2017;Bhattacharjee et al, 2015;Chen et al, 2013;Flaig et al, 2017;Zhang et al, 2018;Yuan et al, 2016;Liu et al, 2019;Li et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of a halogen bond on the crystal structure of terphenyldicarboxylic acid derivatives

Osipov,

Nayfert,

Sobalev

et al. 2024

Acta Crystallogr Sect B

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The syntheses and structures of dimethyl [11,21:24,31-terphenyl]-14,34-dicarboxylate (1), dimethyl 22,25-diiodo[11,21:24,31-terphenyl]-14,34-dicarboxylate (2), potassium [11,21:24,31-terphenyl]-14,34-dicarboxylate (3) and dimethyl [1,1′-biphenyl]-4,4′-dicarboxylate (4) are reported. Neighboring phenyl rings in compounds 1, 3 and 4 have a planar structure (torsion angles are 0.6–4.1°) and the molecules are packed into regular layers. In the structure of the iodinated derivative of terphenyldicarboxylic acid (2), the middle benzene ring of the terphenyl fragment is rotated relative to the other rings by 64° due to the repulsion between the protons and the iodine atoms of neighboring rings. The formation of halogen bonds between iodine and oxygen atoms of the carbonyl group leads to the movement of molecules of one layer into another layer and the loss of layered structure. Potassium [11,21:24,31-terphenyl]-14,34-dicarboxylate (3) forms crystals with an ionic structure. The coordination number of the potassium cation is eight and the resulting coordination polyhedron is a distorted square antiprism. Dianions in the potassium salt crystal are packed in layers similar to the layers in the dimethyl ethers 1 and 4. Salt 3 has high thermal stability to 500°C.

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“…The MR molecules can be also used for ferroelectric LC photoalignment [19][20][21]. The photoinduced optical anisotropy of photoalignment layer strongly effects the performance of LC devices [22].…”

Section: Introductionmentioning

confidence: 99%

Photo-Induced Anisotropy of Methyl Red Azo Dye in Polymer Film

Kozenkov¹,

Belyaev²,

Чаусов³

2022

Liq. Cryst. and their Appl.

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A photo-induced anisotropy (PIA) of Methyl Red (MR) azo dye embedded in PMMA polymer solid films was investigated by studying dichroic spectra and photo-induced birefringence. The reversible PIA of MR dye was measured in situ during photoactive irradiation process. Photoinduced order increases with the rise of exposure power. It is shown that PIA dark relaxation slows down at higher exposure energy. The MR rotational diffusion was evaluated at different exposure modes. These data are useful for the characterization of Methyl Red azo dye as a liquid crystal photo-aligning material.

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Ferroelectric Smectic C* Phase with Sub-Wavelength Helix Pitch Induced in a Nematic Liquid Crystal by Chiral Non-Mesogenic Dopants

Cited by 6 publications

References 19 publications

Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures

Fluorinated Biphenylpyrimidine as a Possible Matrix for Ferroelectric Liquid Crystal Mixtures

Effect of a halogen bond on the crystal structure of terphenyldicarboxylic acid derivatives

Photo-Induced Anisotropy of Methyl Red Azo Dye in Polymer Film

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