Liu Jianqiang, Zhang Qizhen, Zhang Jingzhi. Photochromism of the Star-like Liquid Crystals Containing Azobenzene[J]. Chinese Journal of Chemical Physics , 2005, 18(5): 817-820. doi: 10.1088/1674-0068/18/5/817-820
Citation: Liu Jianqiang, Zhang Qizhen, Zhang Jingzhi. Photochromism of the Star-like Liquid Crystals Containing Azobenzene[J]. Chinese Journal of Chemical Physics , 2005, 18(5): 817-820. doi: 10.1088/1674-0068/18/5/817-820

Photochromism of the Star-like Liquid Crystals Containing Azobenzene

doi: 10.1088/1674-0068/18/5/817-820
Funds:  Project supported by the National Natural Science Foundation of China (29874020).
  • Received Date: 2004-11-01
  • The photochromism of a new star-like liquid crystal that was written by Si(AZO)4 centered by Si and containing four butoxyazobenzene mesogens in its periphery was described. The quantum yield, photoisomerization and photo back-isomerization of Si(AZO)4 in CHCl3 and THF are studied by UV/Vis absorption spectra. The results indicate that the photochromism and photo back-isomerization of Si(AZO)4 in CHCl3 and THF were in accordance with the first order kinetics. The photochromism and photo back-isomerization rate constants are 10-1 s-1, which are 107 times larger than that of side-chain liquid crystalline polymers containing the same azobenzene moieties. These results indicate that the star-like structure does not significantly affect the photoisomerization activity of the azobenzene mesogen in its periphery. The kt/kc of Si(AZO)4 is less than that of azobenzene mesogen which shows that the Si(AZO)4 has better photo-reversibility. So the star-like liquid crystal has potential applications and will become a new type photocontrolable switch and information functional material.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Photochromism of the Star-like Liquid Crystals Containing Azobenzene

doi: 10.1088/1674-0068/18/5/817-820
Funds:  Project supported by the National Natural Science Foundation of China (29874020).

Abstract: The photochromism of a new star-like liquid crystal that was written by Si(AZO)4 centered by Si and containing four butoxyazobenzene mesogens in its periphery was described. The quantum yield, photoisomerization and photo back-isomerization of Si(AZO)4 in CHCl3 and THF are studied by UV/Vis absorption spectra. The results indicate that the photochromism and photo back-isomerization of Si(AZO)4 in CHCl3 and THF were in accordance with the first order kinetics. The photochromism and photo back-isomerization rate constants are 10-1 s-1, which are 107 times larger than that of side-chain liquid crystalline polymers containing the same azobenzene moieties. These results indicate that the star-like structure does not significantly affect the photoisomerization activity of the azobenzene mesogen in its periphery. The kt/kc of Si(AZO)4 is less than that of azobenzene mesogen which shows that the Si(AZO)4 has better photo-reversibility. So the star-like liquid crystal has potential applications and will become a new type photocontrolable switch and information functional material.

Liu Jianqiang, Zhang Qizhen, Zhang Jingzhi. Photochromism of the Star-like Liquid Crystals Containing Azobenzene[J]. Chinese Journal of Chemical Physics , 2005, 18(5): 817-820. doi: 10.1088/1674-0068/18/5/817-820
Citation: Liu Jianqiang, Zhang Qizhen, Zhang Jingzhi. Photochromism of the Star-like Liquid Crystals Containing Azobenzene[J]. Chinese Journal of Chemical Physics , 2005, 18(5): 817-820. doi: 10.1088/1674-0068/18/5/817-820

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