Abstract
The fluorescence decay kinetics from a benzonitrile solution of a dibenzo-18-crown-6 ether bridged porphyrin—fullerene dyad has been studied in the presence of a range of metal ions. Dual-exponential fluorescence decay behaviour has been attributed to conformational flexibility of the molecule influencing quenching interactions between the photo-excited porphyrin and fullerene. Additions of sodium, potassium and lithium ions significantly modulate the observed fluorescence decay processes while the larger tetrabutylammonium ion has only a minor affect. The results are discussed in terms of ion inclusion within the crown ether affecting both the bridge conformational properties and donor—acceptor electronic interactions.
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Ghiggino, K.P., Hutchison, J.A., Shafiqul Islan, DM. et al. Metal ion dependent fluorescence quenching in a crown ether bridged porphyrin—fullerene dyad. Photochem Photobiol Sci 5, 1150–1153 (2006). https://doi.org/10.1039/b614282f
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DOI: https://doi.org/10.1039/b614282f