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Designing highly fluorescent, arylated poly(phenylene vinylene)s of intrinsic microporosity
Ist Teil von
Journal of materials chemistry. C, Materials for optical and electronic devices, 2020-02, Vol.8 (7), p.2248-2257
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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 (
S
BET
). 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 (
F
) 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 (
F
≤ 0.011) and in the solid state (
F
≤ 0.012). The microporosity of the soluble conjugated polymers as potential conjugated polymers of intrinsic microporosity (cPIMs) was further investigated. The
S
BET
of the polymers were related to their optical properties. The polymers show an attractive combination of high
S
BET
surface area (417 m
2
g
−1
) and the occurrence of distinct AIE effects for the
tert
-butyl-
TPE
polymer while the diphenyl-dinaphthylethylene polymers do not exhibit microporosity (
S
BET
≤ 17 m
2
g
−1
) and show ACQ behavior.
The design of new arylated poly(phenylene vinylene) with high fluorescence efficiency (from AIE) and intrinsic microporosity (from
S
BET
) is described.