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