Fluorescence of alizarin complexone and its metal complexes

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• 作者：Horst Kunkely ; Arnd Vogler
• 关键词：Electronic spectra ; Fluorescence ; Alizarin ; Metal complexes
• 刊名：Inorganic Chemistry Communications
• 出版年：2007
• 期刊代码：39_13877003
• 类别：ch
• 出版时间：March 2007
• 卷：10
• 期：3
• 页码：355-357
• 文件大小：118 K

摘要

Alizarin complexone (AC) in ethanol shows two fluorescence bands which originate from the lowest excited singlet before and after proton transfer. Upon addition of various metal ions (Ni²⁺, Zn²⁺, Gd³⁺, Th⁴⁺) to AC in ethanol the formation of well known AC complexes takes place. They are characterized by intense colours which are caused by IL (or ILCT) transitions. If low-energy LF states (Ni²⁺) are absent (Zn²⁺, Gd³⁺, Th⁴⁺) these complexes show a weak fluorescence. Even in the case of Gd and Th a heavy-atom effect is not apparent and fluorescence quenching is not observed. Moreover, AC complexes are not phosphorescent under any conditions.