Influence of alkyl and alkoxy groups on photoresponsive behaviour of bent-core azo mesogens: Synthesis, mesomorphic and photoswitching properties

Hegde, Rekha S.; Sunil, B.N.; Hegde, Gurumurthy; Prasad, Veena

doi:10.1016/j.molliq.2020.113091

Cited by 13 publications

(3 citation statements)

References 31 publications

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“…Whilst phase transitions from ordered mesophases to disordered melts are common, see for example [75,76], we now investigate whether a combination of light and electrical fields could promote an isothermal transition between different mesophases. Even though the columnar phase cannot be transformed isothermally into a smectic phase by the mere application of electrical fields, [28,62] our results in Fig.…”

Section: 𝐸 𝐿mentioning

confidence: 99%

Light-responsive bent-core liquid crystals as candidates for energy conversion and storage

et al. 2022

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Section: 𝐸 𝐿mentioning

confidence: 99%

Light-responsive bent-core liquid crystals as candidates for energy conversion and storage

et al. 2022

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“…Compounds 38 b and 38 c display an enantiotropic smectic B1 phase, while compound 38 d exhibits an enantiotropic smectic B1 phase and an addition of a monotropic smectic B2 phase. Theoretically, a change in the alkyl chain will cause the mesophase property to be varied, and the formation of smectic B proves the point [ 48 ]. Comp 38a 38b 38c 38d 38e R C4H9 C6H13 C8H17 C10H21 C12H25 Comp 39a 39b 39c 39d 39e R OC4H9 OC6H13 OC8H17 OC10H21 OC12H25

…”

Section: Structure–property Relationshipmentioning

confidence: 99%

Liquid Crystals Investigation Behavior on Azo-Based Compounds: A Review

Razali

Jamain

2021

Polymers

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Liquid crystal is an intermediate phase between the crystalline solid and an isotropic liquid, a very common substance in our daily lives. Two major classes of liquid crystal are lyotropic, where a liquid crystal is dissolved in a specific solvent under a particular concentration and thermotropic, which can be observed under temperature difference. This review aims to understand how a structure of a certain azo compound might influence the liquid crystal properties. A few factors influence the formation of different liquid crystals: the length of the alkyl terminal chain, inter/intra-molecular interaction, presence of spacer, spacer length, polarization effects, odd-even effects, and the presence of an electron-withdrawing group or an electron-donating group. As final observations, we show the compound’s different factors, the other liquid crystal is exhibited, and the structure–property relationship is explained. Liquid crystal technology is an ideal system to be applied to products to maximize their use, especially in the electronic and medical areas.

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“…The lowering of the transition temperature, T N-I , could induce an isothermal N-I transition. The photochemically induced transition is promising in order to develop an optical image storage system and their optical rewritable ability [19][20][21][22][23][24][25]. Hockey stick-shaped mesogens often exhibit unusual mesomorphic properties due to their frustration between bent-core and linear shape [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Photoswitching Properties for Hockey Stick-Shaped Mesogens Bearing Azo Benzene Moieties

Sunil¹,

Monika

Shanker

et al. 2021

Front. Phys.

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In this paper, we report the photoresponsive behavior of hockey stick-shaped mesogens bearing azo wing with different terminal alkoxy chains at one terminal end. Except for the compound E16, which exhibits SmC along with nematic phase, all other mentioned compounds exhibit nematic phase alone. Influence of chain length on the photophysical properties were investigated using UV-Vis spectroscopy. It is observed here that influence of chain length is negligible on thermal back relaxation time. Spectroscopic investigation with variable intensities of UV light studies reveals that reverse cis-trans isomerization process was inversely proportional to the intensity of illuminated light. The present study also reveals that the structure-property relationship plays a dominant role on shape anisotropic structures. A spectroscopic study of the solid sample using guest-host mixture was also carried out and the compilation of results forecast these mesogens as ideal candidates for optical storage devices.

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Influence of alkyl and alkoxy groups on photoresponsive behaviour of bent-core azo mesogens: Synthesis, mesomorphic and photoswitching properties

Cited by 13 publications

References 31 publications

Light-responsive bent-core liquid crystals as candidates for energy conversion and storage

Light-responsive bent-core liquid crystals as candidates for energy conversion and storage

Liquid Crystals Investigation Behavior on Azo-Based Compounds: A Review

Evaluation of Photoswitching Properties for Hockey Stick-Shaped Mesogens Bearing Azo Benzene Moieties

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