Photoinduced structural changes of cationic azo dyes confined in a two dimensional nanospace by two different mechanisms

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Photoresponsive change in the basal spacing of cationic azo dye-layered silicate intercalation compoundswas investigated using X-ray diffraction under controlled humidity conditions to investigate the mechanism of the photoresponse triggered by trans-cis photoisomerization. The molecular design of azo dyes was conducted and two cationic azo dyes (phenylazobenzene and phenylazonaphthalene) were used to obtain intercalation compounds with different packing and hydration. Whereas the trans-phenylazobenzene-layered silicate hardly adsorbed water vapor, the trans-phenylazonaphthalene intercalation compound strongly interacted with water. Both azo dyes photoisomerized in the interlayer space reversibly. Under the relative humidity of 95%, the basal spacing of the phenylazobenzene-silicate increased upon UV irradiation, confirming that the change in the basal spacing was caused by the photoinduced hydration. Under the relative humidity of 6.8%, the basal spacing of the phenylazonaphthalene-silicate decreased upon UV irradiation, suggesting that the packing of the phenylazonaphthalene in the interlayer space was changed to be compacted by the photochemical conversion to the cis-form.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2017
Language
English
Article Type
Article
Citation

RSC ADVANCES, v.7, no.13, pp.8077 - 8081

ISSN
2046-2069
DOI
10.1039/c6ra27749g
URI
http://hdl.handle.net/10203/282750
Appears in Collection
CBE-Journal Papers(저널논문)
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