Fluorescence of alizarin complexone and its metal complexes |
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| Affiliation: | 1. Departamento de Química, Universidade Federal de São Carlos, UFSCar, Rodovia Washington Luís KM 235, CP 676, 13561-901, São Carlos, SP, Brazil;2. Laboratório de Síntesis Orgánica, Facultad de Química, Universidad de la Habana, Habana 10400, Cuba;3. Departamento de Gerontologia, Universidade Federal de São Carlos, São Carlos, SP, Brazil;4. Departamento de Física e Informática, Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560-970, São Carlos, SP, Brazil |
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| Abstract: | 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. |
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