Visible spectra of crystalline anthraquinone colorants: the impact of crystal packingстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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. (C) 2000 Elsevier Science Ltd. All rights reserved.