Ammenhaeuser, Robin and Lupton, John M. and Scherf, Ullrich (2024) Chain-Length Dependence of the Optical Activity of Helical Triptycene-Based π-Conjugated Ladder Polymers. ADVANCED OPTICAL MATERIALS, 12 (1). p. 2301857. ISSN 2195-1071,
Full text not available from this repository. (Request a copy)Abstract
Helical ladder polymers are designed by connecting planar indenofluorene chromophores by chiral triptycene linkers. The resulting hexagonal helices exhibit a substantial degree of homoconjugation across the triptycene knots, with saturation above approximate to 20 repeat units. The chiroptical anisotropy values gabs = Delta epsilon/epsilon of the lower-energy lobes of the red-most couplets in the circular dichroism (CD) spectra arise from the pi-pi* transition of the planar indenofluorene chromophores and increase almost sevenfold when going from a model dimer to the corresponding polymeric helical ladder structures. This increase represents a signature of "chiral amplification" that is observed at the molecular, single-chain level. Here, the incorporated chiral linker units determine the chiroptical properties of the helical polymer chain, with chiral interactions arising across many achiral indenofluorene building blocks (>12). This behavior is observed for a fully covalently bound single polymer chain, in contrast to the more commonly studied supramolecular assemblies of appropriate chiral molecules.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | POLY(ARYLENEVINYLENE)S; POLYARYLENES; chiral amplification; circular dichroism; helical polymers; ladder polymers |
| 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: | 24 Apr 2024 05:57 |
| Last Modified: | 04 Mar 2025 06:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60407 |
Actions (login required)
 |
View Item |
