Liu, Su and Schmitz, Daniela and Jester, Stefan-S. and Borys, Nicholas J. and Hoeger, Sigurd and Lupton, John M. (2013) Coherent and Incoherent Interactions between Cofacial H-Conjugated Oligomer Dimers in Macrocycle Templates. JOURNAL OF PHYSICAL CHEMISTRY B, 117 (16). pp. 4197-4203. ISSN 1520-6106,
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The interactions between two pi-conjugated oligomers templated in molecular scaffolds are revealed as a function of separation and orientation, providing models of intermolecular interactions in bulk organic semiconductor materials. For a variety of dimer geometries (acyclic and macrocyclic) of the same model oligomer, no change in fluorescence spectra, fluorescence dynamics, or low-temperature single-molecule emission characteristics is observed. A small red-shift and slowing of fluorescence in the most closely spaced macrocyclic dimer structure is thought to arise both due to an intramolecular solvatochromic shift as well as from weak intramolecular aggregate formation. No corresponding effect is observed in bulk films of the acyclic model oligomer, implying the absence of intermolecular aggregate or excimer formation due to random relative dipole orientations. The largest effect of intramolecular geometry of the model dimer structures is seen in transient fluorescence depolarization, where an open ring geometry leads to rapid depolarization, compared to the corresponding macrocycle, due to the presence of a range of molecular transition dipole moment orientations. Self-assembled monolayers of the molecules on HOPG investigated by scanning-tunneling microscopy further illustrate the conformational variability of the open dimers in contrast to the fixed conformation of the closed dimers.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RESONANCE ENERGY-TRANSFER; INTERCHAIN INTERACTIONS; CHARGE-TRANSPORT; SINGLE-MOLECULE; POLYMERS; SPECTROSCOPY; DYNAMICS; FILMS; MACROMOLECULES; FLUORESCENCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group John Lupton |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Apr 2020 07:59 |
| Last Modified: | 16 Apr 2020 07:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16801 |
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