77643-99-3

Upstream product

• 77643-98-2 trans-4-butyl-4'-methoxyazobenzene 

Downstream Products

• 77643-98-2 trans-4-butyl-4'-methoxyazobenzene 

Relevant academic research and scientific papers

Photochemical Control of Properties of Ferroelectric Liquid Crystals. 2. Effect of the Structure of Guest Photoresponsive Molecules on the Photochemical Switching of Polarization

The photochemical switching of polarization of ferroelectric liquid crystals (FLCs) was investigated for various structures of guest photoresponsive molecules.The structure of the photoresponsive molecules affected significantly the efficiency of inducing the switching of polarization.It was found that azobenzenes with a structure similar to the host FLC induced the photochemical switching of polarization quite effectively.

Femtosecond dynamics and stimulated emission from the S2 state of a liquid crystalline trans-azobenzene

The excited-state S2 dynamics of an azobenzene derivative, trans-BMAB, was investigated in solution by femtosecond transient absorption and picosecond single-photon timing fluorescence spectroscopies. The fluorescence was observed at 400 nm with a lifetime ~250 fs. The S1 state with an absorption maximum at 410-415 nm was formed with a time constant of ~250 fs from the S2 state followed by relaxation with a lifetime of ~2.3 ps in n-hexane. The stimulated emission from the S2 state overlapped with the femtosecond transient absorption spectra just after excitation, which was confirmed by polarization absorption spectroscopy.

Photochemical Image Storage in Polymer Liquid Crystals

Amplified optical image storage has been demonstrated in polymer liquid crystals (PLC).A small amount (n was varied as n = 2, 3, 5, and 6.Photoirradiation of the PA3/BMAB film with a 366 nm light caused trans -> cis isomerization of BMAB, which induced simoltaneously the nematic (N) -> isotropic phase transition of the PLC films.This photochemically induced phase transition was reversible and photoirradiation with a 525 nm light which induced cis -> trans isomerization restored the system to the initial phase (N).The photo-induced phase transition was found to be strongly dependent on molecular weight of the host PLC and temperature.

Photoswitchable fluorescence on/off behavior between cis- and trans-rich azobenzenes

We report rapid photoswitchable fluorescence on/off behavior between cis- and trans-rich 4-butyl-4′-methoxyazobenzene and its analogue 4-butyl-2,6-dimethyl-4′-methoxyazobenzene.

Photochemical Phase Transition Behaviors of Ternary Mixtures of Photochromic Azobenzene Derivative, Low Molecular Weight Liquid Crystal and Polymer Liquid Crystal

Ternary mixtures of a photochromic azobenzene guest, low molecular weight liquid crystal (LMWLC) and polymer liquid crystal (PLC) were used and their photochemical phase transition behaviors were explored with special reference to the stability of the photochemically induced isotropic phase and the response to photoirradiation.It was found that the rate of the photochemical phase transition increased as the mole fraction of the LMWLC component increased, demonstrating that the response of the systems is improved in the presence of the LMWLC components.Furthermore, the stability of the photochemically stored image has been shown to be much improved in the presence of the PLC components.Results obtained in this study clearly indicate that the LMWLC/PLC mixtures are promising as hosts for the optical image recording devices.

Aplified Image Recording in Liquid Crystal Media by Means of Photochemically Triggered Phase Transition

Over 100 times amplified image recording was achieved by means of reading out nematic isotropic phase transition of liquid crystal induced by partial trans->cis photoisomerization of a small amount (up to 5 molpercent) of 4-butyl-4'-methoxyazobenzene mixed with 4-cyano-4'-n-pentylbiphenyl.