Photoresponse Behaviour of a New Photochromic Liquid Crystalline Carbosilane Dendrimer of the First Generation Containing Hexyloxyazobenzene Moieties Groups in Its Periphery

Abstract

Abstract: Studies were made of on the absorbance at 360 nm A₃₆₀, difference of absorbance at 360 nm ΔA₃₆₀, intensity of light I₀, absorption intensity of light I_a, molar extinction coefficient at 360 nm €₃₆₀, maximum absorption wavelength λ_max, quantum yield Φ, activation energy E, trans/cis isomer absorbance ratio A/A₀, trans/cis photo-isomerization reaction rate constant k_p, photo back-isomerization positive/counter reaction rate constants k_t and k_c, thermal back-isomerization reaction rate constant k_H at different temperatures and photo back-isomerization reaction equilibrium value k_t/k_c of a new carbosilane photochromic liquid crystalline(LC) dendrimer of the first generation(G1) containing twelve 4-hexyloxyazobenzene moieties in its periphery and azobenzene unit M3 in solvents such as chloroform, tetrahydrofuran and so on. solvent were described. The photochromic rate constant of G1 and M3 are 10^-1 s^-1, their photoresponsive rate are 10⁷ times larger than that of photochromic liquid crystalline polysiloxane.

Key words: Photochromic liquid crystalline dendrimer, Photoelectric informational functional material, Photoisomerization, Photo back-isomerization, Thermal back-isomerization, Activation energy

CLC Number:

O631

TrendMD:

ZHANG Qi-Zhen, LIU Jian-Qiang, YIN Xiao-Ying, ZHANG Jing-Zhi. Photoresponse Behaviour of a New Photochromic Liquid Crystalline Carbosilane Dendrimer of the First Generation Containing Hexyloxyazobenzene Moieties Groups in Its Periphery[J]. Chem. J. Chinese Universities, 2004, 25(7): 1368.

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Photoresponse Behaviour of a New Photochromic Liquid Crystalline Carbosilane Dendrimer of the First Generation Containing Hexyloxyazobenzene Moieties Groups in Its Periphery

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