Effective tuning of optical storage devices using photosensitive bent-core liquid crystals

Sunil, B.N.; Srinatha, M.K.; Shanker, Govindaswamy; Hegde, Gurumurthy; Alaasar, Mohamed; Tschierske, Carsten

doi:10.1016/j.molliq.2020.112719

Cited by 30 publications

(17 citation statements)

References 27 publications

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“…5 Interestingly, dissolved 4c reached photostationary state in 10 seconds, significantly faster than reported response rates of similar ABLCs, which are in minutes and even hours. 11,13,14,[16][17][18]22,24,[44][45][46][47] Compound 4c can turn from crystalline solid into nematic phase (Figure 3 The ratio of the isomer concentrations can be estimated by the following equation:…”

Section: Photosensitivity Of 4cmentioning

confidence: 99%

“…5,6 These characteristics also give rise to a myriad of potential applications of ABLC in areas such as elastomer, holographic imaging, optical data storage, and nanomachines. [7][8][9][10][11] To date, the majority of ABLC compounds implemented at least one ester as the direct linkage of the central bent-core and or deployed azo groups in the distant side arms, 5,[12][13][14][15][16][17] which usually exhibited high temperatures of phase transition, far above room temperature 25 °C, and narrow temperature ranges of nematic phases. To lower the phase transition temperature and broaden the temperature range of nematic phases, recent studies emphasized on structural alterations such as introducing different lateral substitutions on the bending core, 12,13,18 adjusting the number of aromatic units, 14,[19][20][21] modifying the type, number, and position of linkage groups, 14,[22][23][24][25] and changing the type and length of the terminal chains.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of 4-Chloro-1,3-Diazobenzene Bent-Cores Liquid Crystal and Characterizations of Its Mesogenic Behaviors and Photosensitivity

Lü¹,

Zhang²,

Yan³

et al. 2020

Preprint

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Azobenzene-based bent-core liquid crystals demonstrate a variety of mesomorphic behaviors and photochromic properties which are desirable for optical switching. In this study, a novel compound was synthesized by adding azo functional groups and chlorine substituent to the central bent-cores to form a 4-chloro-1,3-dizaophenylene bent-core. This compound was characterized by fourier-transform infrared spectroscopy (FTIR), 1H and 13C nuclear magnetic resonance (NMR), mass spectrometry (MS), differential scanning calorimetry (DSC), polarized optical microscopy (POM), ultraviolet–visible spectroscopy (UV-Vis) to evaluate its structure, mesogenic properties, and photosensitivity. The experimental results show that compound 4c exhibits a broad temperature window of 63.8 °C for nematic phase, rapid photoisomerization in seconds, and high cis fraction 0.81. At room temperature, compound 4c dissolved in ethyl acetate solution can reach photostationary state in 10 seconds. At 95 °C, compound 4c in nematic phase became isotropic liquid under UV-irradiation in 3 seconds due to the forward trans – cis photoisomerization and can be restored to be nematic under natural visible light in 5 seconds because of the backward cis – trans photoisomerization. Density functional theory calculations confirm that the diazo as the central linkages instead of esters can effectively reduce the molecular dipole moment, which promotes these favorable characteristics. This study provides valuable insights to improve future design of azobenzene bent-core liquid crystals for practical applications especially in photonic applications.

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Section: Photosensitivity Of 4cmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of 4-Chloro-1,3-Diazobenzene Bent-Cores Liquid Crystal and Characterizations of Its Mesogenic Behaviors and Photosensitivity

Lü¹,

Zhang²,

Yan³

et al. 2020

Preprint

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“…An interesting study was undertaken to prepare and design enormous new mesogenic liquid crystal (LC) structures for display applications and technologies [1][2][3][4][5][6]. Kato et al [7] reported in 1989 the first hydrogen-bonded supramolecular liquid crystal complex (HBSMCs) induced via intermolecular hydrogen-bonding (H-bonding) interactions between pyridine derivative and a carboxylic acid.…”

Section: Introductionmentioning

confidence: 99%

“…H-bonding interactions are power tools for forming and inducing new mesophases [7][8][9][10][11][12][13]. Thus, HBSMCs have been attracting considerable attention based on the preparation of new geometrical molecules, as well as the mesomorphic characterizations and the structure-property relationships of them [1][2][3][4][5][6][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Nematogenic Laterally Substituted Supramolecular H-Bonded Complexes Based on Flexible Core

Ahmed

Khushaim

2020

Crystals

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New laterally CH3-substituted series of 1:2 hydrogen-bonded supramolecular complexes (HBSMCs) based on flexible acid core were prepared and mesomorphically investigated. Mixtures were formed through H-bonded interactions between adipic acid (A) and 4-(2-(pyridin-4-yl)diazenyl-(3-methylphenyl) 4-alkoxybenzoate (Bn). Mesomorphic and optical properties were investigated by differential scanning calorimetry (DSC), polarized optical microscopy (POM), X-ray diffraction (XRD), and UV-spectroscopy. HBSMCs formed from 1:2 mol mixture of A:2Bn, where the base component (B) bearing different alkoxy chain lengths from n = 8 to 14. The new HBSMCs (A/2B) interactions were confirmed by Fermi-bands formation via FT-IR spectroscopy measurements. Results revealed that all prepared HBSMCs are enantiotropic, exhibiting induced nematic (N) phase. The XRD pattern confirmed the POM texture results. Moreover, a comparison was made between the new laterally HBSMC series based on flexible core and the previously analyzed laterally neat complexes.

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“…5,6 These characteristics also give rise to a myriad of potential applications of ABLC in areas such as elastomer, holographic imaging, optical data storage, and nanomachines. [7][8][9][10][11] To date, the majority of ABLC compounds implemented at least one ester as the direct linkage of the central bent-core and or deployed azo groups in the distant side arms, 5,[12][13][14][15][16][17] which usually exhibited high temperatures of phase transition, far above room temperature 25 °C, and narrow temperature ranges of nematic phases. To lower the phase transition temperature and broaden the temperature range of nematic phases, recent studies emphasised on structural alterations such as introducing different lateral substitutions on the bending core, 12,13,18 adjusting the number of aromatic units, 14,[19][20][21] modifying the type, number, and position of linkage groups, 14,[22][23][24][25] and changing the type and length of the terminal chains.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 4-Chloro-1,3-Diazobenzene Bent-Cores Liquid Crystal and Characterizations of Its Mesogenic Behaviors and Photosensitivity

Lü¹,

Zhang²,

Yan³

et al. 2020

Preprint

View full text Add to dashboard Cite

Azobenzene-based bent-core liquid crystals demonstrate a variety of mesomorphic behaviours and photochromic properties which are desirable for optical switching. In this study, a novel compound 4c was synthesised by adding azo functional groups and chlorine substituent to the central bent-core. The structure, mesogenic properties, and photosensitivity of 4c was characterised by fourier-transform infrared spectroscopy (FTIR), 1H and 13C nuclear magnetic resonance (NMR), mass spectrometry (MS), differential scanning calorimetry (DSC), polarised optical microscopy (POM), and ultraviolet–visible spectroscopy (UV-Vis). The experimental results show that 4c exhibited a broad temperature window of nematic phase (63.8 °C), rapid trans – cis photoisomerisation in seconds, and high cis fraction of 0.81. At room temperature, 4c dissolved in ethyl acetate can reach photostationary state in 10 seconds. At 95 °C, nematic 4c became isotropic under UV irradiation in 3 seconds and can be restored to be nematic under natural visible light in 5 seconds. Quantum mechanics calculations confirm that using azos instead of esters as the central linkages can effectively reduce the molecular dipole moment and enhance the overall molecular polarisabilities, which promotes favourable mesogenic and photonic behaviours. This study provides novel synthesis route and synergistic approach to advance the design of azobenzene bent-core liquid crystals.

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Effective tuning of optical storage devices using photosensitive bent-core liquid crystals

Cited by 30 publications

References 27 publications

Synthesis of 4-Chloro-1,3-Diazobenzene Bent-Cores Liquid Crystal and Characterizations of Its Mesogenic Behaviors and Photosensitivity

Synthesis of 4-Chloro-1,3-Diazobenzene Bent-Cores Liquid Crystal and Characterizations of Its Mesogenic Behaviors and Photosensitivity

Nematogenic Laterally Substituted Supramolecular H-Bonded Complexes Based on Flexible Core

Synthesis of 4-Chloro-1,3-Diazobenzene Bent-Cores Liquid Crystal and Characterizations of Its Mesogenic Behaviors and Photosensitivity

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