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PHOTOCHEMICAL REACTION, ACIDICHROMISM AND SUPRAMOLECULAR NANOARCHITECTURES IN THE LANGMUIR-BLODGETT FILMS OF AN AMPHIPHILIC STYRYLQUINOXALINE DERIVATIVE

PHOTOCHEMICAL REACTION, ACIDICHROMISM AND SUPRAMOLECULAR NAN...

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Asia Conference on Nanoscience and Nanotechnology Abstracts Book

作者： MEIFANG YIN HAOFEI GONG BAOWEN ZHANG MINGHUA LIUCAS Key Laboratory of Colloid and Interface Science Institute of Chemistry CAS Beijing 100080 ChinaTechnical Institute of Physics and Chemistry CAS Beijing 100101 China

＜正＞ An amphiphilic styrylquinoxaline derivative, 3-（4-（hexadecyloxy）styryl）quinoxalin-2（1H）-one （SQC16）, was newly synthesized to investigate their photochemical and gas responsive properties in the organized molecular films. It was observed that SQC16 can spread as a monolayer on the subphases with various pH values and can be subsequently transferred onto solid substrates. While SQC16 showed predominantly reversible trans-cis photoisomerization in the methanol solution, it showed both photoisomerization and photodimerization in the LB film. The photodimerization was only observed in the LB film due to the face-to-face arrangement of the functional headgroup in the LB film and the process was irreversible. In addition, the LB film showed an acidichromism, i.e. when the film was exposed to HCl gas it turned its color from yellow to red and the color could be recovered after exposing to NH3 gas. The process was reversible and could be repeated many times. Interesting surface morphology of the SQC16 LB film was revealed. It was observed that SQC16 can form nanowire architecture in the transferred one-layer LB film. Such morphology can be changed upon photoirradiation or in gas reactions. Through the AFM measurements, it was suggested that the photodimerization predominantly occurred from the nanowire structures, while during the acidichromism the reaction occurred preferentially in the flat region. XRD studies revealed that while layer distance showed a slight change for the LB film during the acidichromism and photoreaction, the layer structure of SQC16 LB film was kept.

关键词： photodimerazation acidchromism Langmuir-Blodgett

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