Journal
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Volume 55, Issue 23, Pages 3862-3867Publisher
WILEY
DOI: 10.1002/pola.28770
Keywords
aggregation-induced emission; pi-conjugated polymers; direct arylation polycondensation; microporous polymers; solvatochromism
Categories
Funding
- [17H05171]
- [15K17872]
- [17K05891]
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In this study, we report the synthesis of pi-conjugated network polymers including unique fluorescent units via palladium-catalyzed direct (CAH) arylation polycondensation of 1,2,4,5-tetrafluorobenzene with tetrabromoarenes. The obtained polymers, including tetraphenylethene (TPE) or pyrene (PYR) units, had microporous structures with the specific Brunauer-Emmett-Teller (BET) surface areas at 508 and 824 m(2) g(-1), respectively. These polymers possessed narrow pore distributions (<15 nm). These analyses supported that pi-conjugated microporous polymers (CMPs) were synthesized by the direct arylation. Similar to the result of BET surface areas, carbon capture capacity of CMP based on PYR unit was higher than that of CMP based on TPE unit. Because the nitrogen capture capacity of these CMPs was low (approximate to 0), selectivity of carbon dioxide adsorption was very high. TPE is a typical aggregation-induced emission unit but PYR is an aggregation-caused quenching (ACQ) molecule. The incorporation of TPE unit into the microporous polymer gave green-colored fluorescence (Phi = 0.12). The polymer including PYR units also showed the green-colored fluorescence (Phi = 0.05) even though the ACQ property. These synthesized CMPs exhibited characteristic solvatofluorochromism. (C) 2017 Wiley Periodicals, Inc.
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