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Shining a Light on s-Triazine-Based Polymers

Butchosa, Cristina; McDonald, Tom O; Cooper, Andrew I; Adams, Dave J; Zwijnenburg, Martijn A; (2014) Shining a Light on s-Triazine-Based Polymers. Journal of Physical Chemistry C , 118 (8) pp. 4314-4324. 10.1021/jp411854f. Green open access

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The strong interplay between the structure and optical properties of conjugated s-triazine-based framework (CTF) materials is explored in a combined experimental and computational study. The experimental absorption and fluorescence spectra of the CTF-1 material, a polymer obtained through the trimerization of 1,4-dicyanobenzene, are compared with the results of time-dependent density functional theory and approximate coupled cluster theory (CC2) calculations on cluster models of the polymer. To help explain the polymer data, we compare its optical properties with those measured and predicted for the 2,4,6-triphenyl-1,3,5-triazine model compound. Our analysis shows that CTFs, in line with experimental diffraction data, are likely to be layered materials based around flat hexagonal-like sheets and suggests that the long-wavelength part of the CTF-1 absorption spectrum displays a pronounced effect of stacking. Red-shifted peaks in the absorption spectrum appear that are absent for an isolated sheet. We also show that the experimentally observed strong fluorescence of CTF-1 and other CTF materials is further evidence of the presence of rings in the layers, as structures without rings are predicted to have extremely long excited state lifetimes and hence would display negligible fluorescence intensities. Finally, subtle differences between the experimental absorption spectra of CTF-1 samples prepared using different synthesis routes are shown to potentially arise from different relative arrangements of stacked layers.

Type: Article
Title: Shining a Light on s-Triazine-Based Polymers
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/jp411854f
Publisher version: https://doi.org/10.1021/jp411854f
Language: English
Additional information: This is an open access article available under the Creative Commons Attribution 4.0 International (CC BY 4.0) licence.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
UCL > Provost and Vice Provost Offices > UCL BEAMS
URI: https://discovery.ucl.ac.uk/id/eprint/10146857
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