Fluorescence lifetimes of metal(III) chelates of 5-sulphoquinolin-8-ol and their modification by the internal heavy atom effect

For metal(III) [M(III)] 5-sulphoquinolin-8-olates, systematic studies of the atomic number effect in complexes exhibiting ligand fluorescence were carried out in aqueous solution. The fluorescence lifetimes of various chelates were investigated as a function of complexed metal ion, pH and metal-to-l...

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Bibliographic Details
Published in:Analytica chimica acta 1994-02, Vol.286 (2), p.241-246
Main Authors: Hoffmann, K., Stahl, U., Dähne, S.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Fluorimetry
Spectrometric and optical methods
Sulphoquinolin-8-ol metal chelates
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Summary:For metal(III) [M(III)] 5-sulphoquinolin-8-olates, systematic studies of the atomic number effect in complexes exhibiting ligand fluorescence were carried out in aqueous solution. The fluorescence lifetimes of various chelates were investigated as a function of complexed metal ion, pH and metal-to-ligand ratio. The reported data for M(III) 5-sulphoquinolin-8-olates in aqueous solution include absorption and emission maxima, fluorescence quantum yields and fluorescence lifetimes, in addition to calculated rate constants of fluorescence and intersystem crossing. It was found that the internal atomic number effect is sufficient to distinguish between different M(III) chelates in aqueous media on the basis of their fluorescence lifetimes. The analytical applicability is limited, however, by the influence of the metal-to-ligand ratio and pH sensitivity.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(94)80166-5