This paper is part of a symposium-in-print dedicated to Professor Eduardo A. Lissi on the occasion of his 70th birthday.
Fusion–Fission Transport of Probes and Quenchers in Microdomains of an Amphiphilic Ionene Polyelectrolyte†
Article first published online: 9 MAY 2007
Photochemistry and Photobiology
Volume 83, Issue 3, pages 542–546, May/June 2007
How to Cite
Tcacenco, C. M. and Quina, F. H. (2007), Fusion–Fission Transport of Probes and Quenchers in Microdomains of an Amphiphilic Ionene Polyelectrolyte. Photochemistry and Photobiology, 83: 542–546. doi: 10.1562/2006-09-09-RA-1036
- Issue published online: 9 MAY 2007
- Article first published online: 9 MAY 2007
- Received 9 September 2006; accepted 21 November 2006; published online 28 November 2006
In aqueous solution, amphiphilic ionenes such as the [3,22]-ionene spontaneously adopt globular conformations and form microdomains that are highly micelle-like, i.e. are capable of solubilizing organic molecules, binding and exchanging counterions and accelerating or inhibiting the rates of bimolecular reactions. Time-resolved fluorescence decay of pyrene and pyrene derivatives solubilized in these microdomains at concentrations where excimer formation occurs show that even water-insoluble probes can migrate between the hydrophobic microdomains formed in aqueous solution by a [3,22]-ionene chloride (with the N-terminal groups quaternized with benzyl chloride). Time-resolved studies of the quenching of pyrene fluorescence by alkylpyridine derivatives revealed similar behavior. The observed quenching behavior requires that the migration be between microdomains on the same ionene chain or same group of associated ionene chains and is consistent with migration dominated by fusion/fission transport of the probe and quencher.