@article{8d5f982490004b4ebb01fdd3d49bad6f,
title = "Spectral Properties and Photochromic Characteristics of Spiropyran Dyes",
abstract = "The bis-benzospiropyran (BBSP) and nitro-substituted indoline spirobenzopyrans(SBP) were prepared by following a simple procedure. The reaction mechanism of synthesizing bis-benzospiropyran is discussed. A comparative analysis of the spectral and photochromic properties between SBP and BBSP was carried out with the aid of a PMMA film. The results indicate that chemical structures and UV irradiation played an important role in the spectral and photochromic properties of SBP and BBSP, which would readily affect λmax of the colored forms and the reversibility. The IR spectra and 1H NMR spectra of these compounds are used to interpret the photochromic phenomena under different UV irradiations and determine the configurations of SBP and BBSP.",
keywords = "Photochromism, Protonation, Spiropyran, UV radiation",
author = "Shen, {Kai Hua} and Han, {Jian Guo} and Gang Zhang and Choi, {Dong Hoon}",
note = "Funding Information: Since the last decade, a large number of works have concentrated on the photochromic behavior of in- dolinospirobenzopyran dyes{"}41 . Interest in these com- pounds has been concerned with the reversibility of the transformation between the colorless spiro forms and the colored merocyanines{"} . Structural modification of these dyes has been an active research area since these compounds were found to have potential applications, including being used as recording, copying and display materials. It was reported that merocyanine dyes, in- cluding spiropyran and merocyanine complexes (BBSP) , were capable of forming molecular aggre- gate~'~{"}'. A multistep synthesis has been proposed, which started from 5 -amino Fischer base through sever- al tedious steps and was involved with the preparation of bis-Fischer bases. Bis-Fischer bases then reacted with salicylaldehyde to give the corresponding BSPs[*] (Scheme 1 ). In order to control the aggregate growth and there- by prepare a novel bis-benzospiropyran, a simple pre- paration method for bis-benzospiropyran ( BBSP ) and * Supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education( No. 2004-527). * * To whom correspondence should be addressed. E-mail : shen-kh@ yahoo. com. cn",
year = "2006",
month = jul,
doi = "10.1016/S1005-9040(06)60151-7",
language = "English",
volume = "22",
pages = "505--509",
journal = "Chemical Research in Chinese Universities",
issn = "1005-9040",
publisher = "Jilin University Press",
number = "4",
}