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Designing highly fluorescent, arylated poly(phenylene vinylene)s of intrinsic microporosity

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Abstract

Three new polymers containing tetraphenylethylene and diphenyl-dinaphthylethylene cores and their corresponding monomeric model compounds were synthesized and fully characterized aiming to investigate their photoluminescence efficiency, microporosity and Brunauer–Emmett–Teller-derived surface areas (SBET). Comprehensive photophysical characterization was undertaken in the solid state (powder and thin films), in tetrahydrofuran (THF) solution and in mixtures of “good” and “poor” solvent to induce aggregation (THF:water mixtures). Aggregation induced emission (AIE) was found for the tert-butyl-TPE monomer and polymer and diphenyl-dinaphthylethylene monomer with the increase of the water amount in THF:water mixtures and in the solid state. The tert-butyl substituted TPE derivatives display the highest fluorescence quantum yield (ϕF) values: 0.14 to 0.30 (in powder) and 0.46 to 0.64 in thin films. In contrast, with the diphenyl-dinaphthylethylene (meta and para-phenylene) polymers aggregation caused quenching (ACQ) occurs in THF:water mixtures (ϕF ≤ 0.011) and in the solid state (ϕF ≤ 0.012). The microporosity of the soluble conjugated polymers as potential conjugated polymers of intrinsic microporosity (cPIMs) was further investigated. The SBET of the polymers were related to their optical properties. The polymers show an attractive combination of high SBET surface area (417 m2 g−1) and the occurrence of distinct AIE effects for the tert-butyl-TPE polymer while the diphenyl-dinaphthylethylene polymers do not exhibit microporosity (SBET ≤ 17 m2 g−1) and show ACQ behavior.

Graphical abstract: Designing highly fluorescent, arylated poly(phenylene vinylene)s of intrinsic microporosity

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Supplementary files

Article information


Submitted
12 Nov 2019
Accepted
04 Dec 2019
First published
06 Dec 2019

This article is Open Access

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Designing highly fluorescent, arylated poly(phenylene vinylene)s of intrinsic microporosity

A. C. B. Rodrigues, I. S. Geisler, P. Klein, J. Pina, F. J. H. Neuhaus, E. Dreher, C. W. Lehmann, U. Scherf and J. S. Seixas de Melo, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06028F

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