Spectral manifestation of protonation of photochromic naphthopyrans

The formation of proton complexes of the photoinduced colored open form of naphthopyrans in solutions was first discovered and investigated by spectral-kinetic method. The complexes exhibit a new absorption band in the visible region, which is bathochromically shifted relative to the absorption band...

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Bibliographic Details
Published in:Dyes and pigments 2021-01, Vol.184, p.108833, Article 108833
Main Authors: Gorelik, Alexander М., Venidiktova, Оlga V., Kobeleva, Оlga I., Valova, Тatyana М., Barachevsky, Valery А.
Format: Article
Language:English
Subjects:
Acid
Naphthopyran
Photochromism
Proton complex
Rate constant
Spectroscopy
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Summary:The formation of proton complexes of the photoinduced colored open form of naphthopyrans in solutions was first discovered and investigated by spectral-kinetic method. The complexes exhibit a new absorption band in the visible region, which is bathochromically shifted relative to the absorption band of the photoinduced colored open form. With an increase in the concentration of perchloric or hydrochloric acid, this long-wavelength absorption band appears immediately after the addition of acids to solutions of photochromic compounds. The protonation efficiency depends on the strength of the acids. [Display omitted] •The formation of proton complexes of the photoinduced color open form of naphthopyrans in solutions was investigated.•The proton complexes exhibit a new absorption band in the long-wave visible region.•The protonation efficiency depends on the strength of the acids.•It was firstly shown that these proton complexes manifest positive photochromism at the low acid concentrations.•At high acid concentrations nonphotochromic proton complexes are formed in darkness.
ISSN:0143-7208
1873-3743
DOI:10.1016/j.dyepig.2020.108833