Photochromic behavior of spiropyrans: the effect of substituent
Spiropyrans are among the most promising organic p hotochromic dyes. However, spiropyrans are very sensitive dyes and there are m any independent factors that can affect the performance of these dyes. The effect of substituen t on the optical absorption spectra, fading kinetic, and also the dy...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Trans Tech Publications, Switzerland
2014
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/40252/ http://irep.iium.edu.my/40252/1/Photochromic_behavior_of_spiropyrans_The_effect_of__substituent.pdf http://irep.iium.edu.my/40252/4/40252_Photochromic%20behavior%20of%20spiropyrans.SCOPUS.pdf |
| Summary: | Spiropyrans are among the most promising organic p
hotochromic dyes. However,
spiropyrans are very sensitive dyes and there are m
any independent factors that can affect the
performance of these dyes. The effect of substituen
t on the optical absorption spectra, fading
kinetic, and also the dye stability of spiropyrans
in diphenyl ether by UV irradiation has been
investigated. The 6-nitro BIPS displayed greater ab
sorbance intensity of 0.740% at 600nm
compared to 8-ethoxy-6-nitro BIPS of 0.651% at 620n
m. Furthermore, 6-nitro BIPS is less stable as
it has higher rate constant of 0.1003s
-1
and thus lower half-life time (50% decay of the
photochromic effect) of 6.9s, in contrast to 8-etho
xy-6-nitro BIPS of 0.0594s
-1
and 11.7s
respectively. |
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