Cofluorescence of Eu in complexes of aromatic carboxylic acids |
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Authors: | BS Panigrahi Susy Peter KS Viswanathan |
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Institution: | Materials Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India |
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Abstract: | The fluorescence of Eu3+ in certain Eu3+–aromatic acid complexes were enhanced by over two orders of magnitude, by the addition of La3+; a process referred to as cofluorescence. Cofluorescence was observed only with certain aromatic acid ligands; trismesic acid, pyromellitic acid and mellitic acid; thereby clearly establishing a correlation between the structure of the ligand and the process of cofluorescence. While cofluorescence has been extensively studied using β-diketones as ligands, our studies demonstrate cofluorescence for the first time in ligands other than β-diketones. Furthermore, the mechanism of cofluorescence in the aromatic acid complexes studied by us appears to be different from that operating in the β-diketones. While intermolecular energy transfer is believed to occur in the β-diketones, formation of polynuclear complexes appears to be responsible for cofluorescence in the aromatic acid ligands. |
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Keywords: | Cofluorescence Eu3+ fluorescence Fluorescence enhancement Trimesic acid Pyromellitic acid Mellitic acid La3+ |
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