Lookup NU author(s): Roza Al-Aqar,
Dr Alparsan Atahan,
Professor Andrew Benniston,
Dr Paul Waddell,
Emeritus Professor Anthony Harriman
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley - VCH Verlag GmbH & Co. KGaA, 2016.
For re-use rights please refer to the publisher's terms and conditions.
A compact donor–acceptor molecular dyad has been synthesized by attaching an N,N-dimethylamino fragment to a naphthalic anhydride residue. The dyad shows fluorescence from an intramolecular charge-transfer state (i.e., charge-recombination fluorescence) in solution, with the photo-physical properties being strongly dependent on the solvent polarity. Similar emission is seen for single crystals of the target compound, the molecules being aligned head-to-head, although time-resolved emission profiles display dual-exponential kinetics. A second polymorph with the head-to-tail alignment also gives rise to two lifetimes that differ somewhat from those of the first structure, which are assigned to bulk and surface-bound molecules. Growing the crystal in the presence of Rhodamine B localizes the dye around the surface. Excitation of the crystal is followed by sub-ps exciton migration along the aligned stacks, with occasional crossing to adjacent stacks and trapping at the surface. Rhodamine B present at very low levels acts as the acceptor for excitons entering the surface layer. Crystals embedded in a polyester resin form an artificial light-harvesting antenna able to sensitize an amorphous silicon solar cell.
Author(s): Al-Aqar R, Atahan A, Benniston AC, Perks T, Waddell PG, Harriman A
Publication type: Article
Publication status: Published
Journal: Chemistry: A European Journal
Print publication date: 17/10/2016
Online publication date: 06/09/2016
Acceptance date: 01/09/2016
ISSN (print): 0947-6539
ISSN (electronic): 1521-3765
Publisher: Wiley - VCH Verlag GmbH & Co. KGaA
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