Fluorescence quenching and complexation behaviour of tetraphenylporphyrin with some divalent metal ions
- 1 January 1996
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 92 (5) , 747-751
- https://doi.org/10.1039/ft9969200747
Abstract
The fluorescence quenching and complexation behaviour of tetraphenylporphyrin (TPP) have been studied using fluoresence, electronic absorption spectra and the stopped-flow technique. The second-order fluorescence quenching rate constant (kq) increases in the order Ni2+ > Co2+ > Hg2+ > Sn2+ in methanol. Both Ni2+ and Co2+ ions form relatively stable complexes with TPP and the complex formation in this case is slow. In the case of Hg2+ and Sn2+, complex formation is fast and the formed complexes are less stable compared with NiTPP and CoTPP complexes. The activation and thermodynamic parameters of the complexation process have been evaluated.Keywords
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