Abstract
This work presents the first study on how to employ the dihydroazulene (DHA)/vinylheptafulvene (VHF) photo/thermoswitch in photoactive liquid crystalline materials.
Highlights
In the eld of liquid crystals, it has been a goal to control the phases and order with an external stimulus
Acetophenones containing biaryl units, 9f and 9g, were obtained in good yields from a palladium-catalyzed Suzuki cross-coupling reaction from 4-iodoacetophenone 10 with boronic acids 11f and 11g, respectively, using conditions that proved fruitful in the synthesis of the benzaldehyde analogues.[13]
When 3g was irradiated with light in the nematic phase at 40 C for 60 min, conversion to the corresponding VHF occurred in a ratio of 3 : 7 (VHF/DHA) as determined by NMR spectroscopy
Summary
In the eld of liquid crystals, it has been a goal to control the phases and order with an external stimulus. Some of the stimuli which have been applied include temperature, magnetic eld, electric eld and light.[1] Light is an interesting stimulus, since this gives the possibility for remote control It has found use in image storing devices.[2,3] Speci cally, this has been shown with azobenzene polymer matrix, where an image was stored for 8 months without signi cant decay.[2] Other photochromic molecules such as dithienylethenes, spiropyrans and fulgides have shown suitable properties for this kind of application.[4,5,6] Here we present a study on liquid crystalline systems based upon the dihydroazulene (DHA) photoswitch (Scheme 1).
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