Browse by author
Lookup NU author(s): Dr Mohammed Alamiry, Emeritus Professor Anthony Harriman
Full text for this publication is not currently held within this repository. Alternative links are provided below where available.
The target artificial light-harvesting antenna, comprising 21 discrete chromophores arranged in a logical order, undergoes photochemical bleaching when dispersed in a thin plastic film. The lowest-energy component, which has an absorption maximum at 660 nm, bleaches through first-order kinetics at a relatively fast rate. The other components bleach more slowly, in part, because their excited-state lifetimes are rendered relatively short by virtue of fast intramolecular electronic energy transfer to the terminal acceptor. Two of the dyes, these being close to the terminal acceptor but interconnected through a reversible energy-transfer step, bleach by way of an autocatalytic step. Loss of the terminal acceptor, thereby switching off the energy-transfer route, escalates the rate of bleaching of these ancillary dyes. The opposite terminal, formed by a series of eight pyrene-based chromophores, does not bleach to any significant degree. Confirmation of the various bleaching steps is obtained by examination of an antenna lacking the terminal acceptor, where the autocatalytic route does not exist and bleaching is very slow.
Author(s): Alamiry MAH, Harriman A, Haefele A, Ziessel R
Publication type: Article
Publication status: Published
Journal: ChemPhysChem
Year: 2015
Volume: 16
Issue: 9
Pages: 1867-1872
Print publication date: 22/06/2015
Online publication date: 21/04/2015
Acceptance date: 01/01/1900
ISSN (print): 1439-4235
ISSN (electronic): 1439-7641
Publisher: Wiley V C H Verlag GmbH & Co. KGaA
URL: http://dx.doi.org/10.1002/cphc.201500150
DOI: 10.1002/cphc.201500150
Altmetrics provided by Altmetric
