Photoresponsive behavior of hydrophilic/hydrophobic-based novel azobenzene mesogens: synthesis, characterization and their application in optical storage devices

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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“…where CE is conversion efficiency amd A (to) , and A (t∞) is absorbance before and after UV illumination, respectively [29].…”

Section: Cementioning

confidence: 99%

“…It is obligatory to determine the first-order kinetic plot for trans-cistrans photoisomerization [29]. The first-order plot for unimolecular thermal cis-trans isomerisation obeys Eq.…”

Section: Kinetic Studiesmentioning

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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Advances in Application of Azobenzene as a Trigger in Biomedicine: Molecular Design and Spontaneous Assembly

et al. 2021

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Azobenzene is a well‐known derivative of stimulus‐responsive molecular switches and has shown superior performance as a functional material in biomedical applications. The results of multiple studies have led to the development of light/hypoxia‐responsive azobenzene for biomedical use. In recent years, long‐wavelength‐responsive azobenzene has been developed. Matching the longer wavelength absorption and hypoxia‐response characteristics of the azobenzene switch unit to the bio‐optical window results in a large and effective stimulus response. In addition, azobenzene has been used as a hypoxia‐sensitive connector via biological cleavage under appropriate stimulus conditions. This has resulted in on/off state switching of properties such as pharmacology and fluorescence activity. Herein, recent advances in the design and fabrication of azobenzene as a trigger in biomedicine are summarized.

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Arylazo‐3,5‐diphenylpyrazole Derivatives: Molecular Probes Exhibiting Reversible Light‐induced Phase Transitions for Energy Storage and Direct Photolithographic Patterning

Kumar,

Parthiban,

Velloth

et al. 2024

Chemistry A European J

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We report azopyrazole photoswitches decorated with variable N‐alkyl and alkoxy chains (for hydrophobic interactions) and phenyl substituents on the pyrazoles (enabling π−π stacking), showing efficient bidirectional photoswitching and reversible light‐induced phase transition (LIPT). Extensive spectroscopic, microscopic, and diffraction studies and computations confirmed the manifestation of molecular‐level interactions and photoisomerization into macroscopic changes leading to the LIPT phenomena. Using differential scanning calorimetric (DSC) studies, the energetics associated with those accompanying processes were estimated. The long half‐lives of Z isomers, high energy contents for isomerization and phase transitions, and the stability of phases over an extended temperature range (‐60 to 80 oC) make them excellent candidates for energy storage and release applications. Remarkably, the difference in the solubility of the distinct phases in one of the derivatives allowed us to utilize it as a photoresist in photolithography applications on diverse substrates.

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Photoresponsive behavior of hydrophilic/hydrophobic-based novel azobenzene mesogens: synthesis, characterization and their application in optical storage devices

Abstract: Effect of Photoresponsive behaviour of hydrophilic/hydrophobic based novel azobenzene's. Powerful structure property relationship. Light plays the dominant role in photoisomerization properties.

Cited by 18 publications

References 41 publications

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

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

Advances in Application of Azobenzene as a Trigger in Biomedicine: Molecular Design and Spontaneous Assembly

Arylazo‐3,5‐diphenylpyrazole Derivatives: Molecular Probes Exhibiting Reversible Light‐induced Phase Transitions for Energy Storage and Direct Photolithographic Patterning

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