Kunkely, Horst and Vogler, Arnd (2011) Absorption and luminescence spectra of cochineal. INORGANIC CHEMISTRY COMMUNICATIONS, 14 (7). pp. 1153-1155. ISSN 1387-7003,
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Carminic acid which can be obtained as extract (cochineal) from certain scale insects is an important red dye with many applications. It shows a red fluorescence under ambient conditions. The lowest-wavelength absorption and the corresponding emission undergo a red shift when carminic acid interacts with metal cations such as Zn(2+), Al(3+), Gd(3+) and Th(4+) in aqueous solution. The Al(3+) complex of carminic acid which is isolated as Ca(2+) salt (carmine) displays this fluorescence also in the solid state while the Ni(2+) complex is not luminescent under any conditions owing to the presence of low-energy ligand field states. (C) 2011 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STATE PROTON-TRANSFER; CARMINIC ACID; METAL-COMPLEXES; FLUORESCENCE; ALIZARIN; HYDROXYANTHRAQUINONES; PHOSPHORESCENCE; COLOR; DYES; Coordination chemistry; Aluminum; Carminic acid; Absorption spectra; Luminescence spectra |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie > Alumni or Retired Professors > Prof. Dr. Arnd Vogler |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Jun 2020 05:23 |
| Last Modified: | 09 Jun 2020 05:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/20614 |
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