Modeling colorimetric characteristics of ON–OFF behavior of photochromic dyes based on bis-azospiropyrans

•Colorimetric properties of some bis-azospiropyrans based photochromic dyes were investigated.•Variations of transmission spectra, hue, chroma and lightness via UV exposure time were studied.•It was tried to find a model that mathematically fits the colorimetic data during UV exposure time. In the p...

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Bibliographic Details
Published in:Journal of molecular structure 2013-10, Vol.1050, p.222-231
Main Authors: Kandi, Saeideh Gorji, Nourmohammadian, Farahnaz
Format: Article
Language:English
Subjects:
Bis-azospiropyrans
CIELAB color space
Colorimetric properties
Photochromic dyes
Transition spectra
UV exposure time
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Summary:•Colorimetric properties of some bis-azospiropyrans based photochromic dyes were investigated.•Variations of transmission spectra, hue, chroma and lightness via UV exposure time were studied.•It was tried to find a model that mathematically fits the colorimetic data during UV exposure time. In the present study, colorimetric characteristics of six photochromic bis-azospiropyrans based dyes are investigated. The colorimetric axes of these dyes in terms of hue, chroma and lightness are considered via UV exposure time. Results showed that, the hue angle of these dyes changes rapidly at the first times of UV irradiation, and then remains almost constant. However, chroma and lightness continuously change till about 80–240s for different dyes. In addition, it is shown that variations of lightness and chroma by UV exposure time have an exponential trend, which can be modeled mathematically.
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2013.07.040