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Photochromic behavior of spiropyrans: the effect of substituent

Nadir, Najiah and Wahid, Zaharah and Zainuddin, Mat Tarmizi and Mohamed Islam, Noor Zalikha (2014) Photochromic behavior of spiropyrans: the effect of substituent. Advanced Materials Research, 925 (2014). pp. 323-328. ISSN 1022-6680

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Abstract

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.

Item Type: Article (Journal)
Additional Information: 6526/40252
Uncontrolled Keywords: Photochromism, spiropyran, substituent, kinetic, s tability
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK452 Electric apparatus and materials. Electric circuits. Electric networks
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering
Kulliyyah of Engineering > Department of Science
Depositing User: Dr. Zaharah Wahid
Date Deposited: 27 Dec 2014 16:02
Last Modified: 27 Sep 2017 11:40
URI: http://irep.iium.edu.my/id/eprint/40252

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