Structure-directed exciton dynamics in templated molecular nanorings

Gong, Juliane Q., Parkinson, Patrick, Kondratuk, Dmitry V. , Gil-Ramírez, Guzmán, Anderson, Harry L. and Herz, Laura M. (2015) Structure-directed exciton dynamics in templated molecular nanorings. The Journal of Physical Chemistry C, 119 (11). pp. 6414-6420. ISSN 1932-7447

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Item Type:Article
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Conjugated polymers with cyclic structures are interesting because their symmetry leads to unique electronic properties. Recent advances in Vernier templating now allow large shape-persistent fully conjugated porphyrin nanorings to be synthesized, exhibiting unique electronic properties. We examine the impact of different conformations on exciton delocalization and emission depolarization in a range of different porphyrin nanoring topologies with comparable spatial extent. Low photoluminescence anisotropy values are found to occur within the first few hundred femtoseconds after pulsed excitation, suggesting ultrafast delocalization of excitons across the nanoring structures. Molecular dynamics simulations show that further polarization memory loss is caused by out-of-plane distortions associated with twisting and bending of the templated nanoring topologies.

Keywords:Chemistry, JCOpen
Subjects:F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Chemistry
ID Code:22712
Deposited On:18 Mar 2016 18:48

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