Visible spectra of crystalline anthraquinone colorants: the impact of crystal packing

The crystal structures of purpurin monohydrate and 1,4-dihydroxy-5,8-di- p-toluidinoanthraquinone were determined from single-crystal and powder X-ray diffraction data, respectively, and the visible reflection spectra of 18 crystalline colorants, (anthraquinones and related compounds) were obtained....

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Bibliographic Details
Published inDyes and pigments Vol. 45; no. 2; pp. 169 - 176
Main Authors Yatsenko, A.V, Chernyshev, V.V, Popov, S.I, Sonneveld, E.J, Schenk, H
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2000
Subjects
Anthraquinone
Crystal structure
Reflectance spectroscopy
Reflectance spectroscopy
Anthraquinone
Crystal structure
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Summary:The crystal structures of purpurin monohydrate and 1,4-dihydroxy-5,8-di- p-toluidinoanthraquinone were determined from single-crystal and powder X-ray diffraction data, respectively, and the visible reflection spectra of 18 crystalline colorants, (anthraquinones and related compounds) were obtained. Twelve of the compounds showed moderate (440–1090 cm −1) bathochromic shifts of their absorption maxima, compared to the solutions; other compounds exhibited greater bathochromic (up to 2900 cm −1) or hypsochromic (up to −1130 cm −1) shifts. For some of the compounds, the differences in colour between crystals and solutions are ascribable to the changes in molecular conformations or to the impact of hydrogen bonds.
ISSN:0143-7208
1873-3743
DOI:10.1016/S0143-7208(00)00021-8