Metal ion dependent fluorescence quenching in a crown ether bridged porphyrin-fullerene dyad.
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.
Ghiggino
Kenneth P
KP
School of Chemistry, University of Melbourne, Victoria, Australia. ghiggino@unimelb.edu.au
Hutchison
James A
JA
Islan
D-M Shafiqul
DM
Araki
Yasuyuki
Y
Ito
Osamu
O
Langford
Steven J
SJ
Lau
Vei-Lin
VL
Takezaki
Makoto
M