Structure-directed exciton dynamics in templated molecular nanorings

Journal article

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.

Authors: Gong, J; Parkinson, P; Kondratuk, D; Gil-Ramírez, G; Anderson, H

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Chemical Society
• Journal: journal of physical chemistry. C, Nanomaterials and interfaces
• Volume: 119
• Issue: 11
• Pages: 6414-6420
• Publication date: 2015-01-01
• DOI: 10.1021/acs.jpcc.5b00210
• EISSN: 1932-7455
• ISSN: 1932-7447
• Language: English