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Photochemical Bleaching of an Elaborate Artificial Light-Harvesting Antenna

Lookup NU author(s): Dr Mohammed Alamiry, Emeritus Professor Anthony Harriman


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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.

Publication metadata

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


DOI: 10.1002/cphc.201500150


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