Journal
POLYMERS
Volume 14, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/polym14102025
Keywords
NBN-embedded polymers; boron-containing polymers; solvatochromic fluorescence; metal ion detection
Categories
Funding
- National Natural Science Foundation of China [21801251]
- Natural Science Foundation of Fujian Province [2021J01199]
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The isosteric replacement of CC by B-N units in conjugated organic systems has attracted significant interest due to its desirable optical, electronic and sensory properties. In this study, a series of polymers with BNB-doped pi-system were synthesized and investigated for their structure, photophysical properties and metal ion detection. The polymers exhibited solvatochromic fluorescence and showed potential as metal fluorescence sensors.
The isosteric replacement of CC by B-N units in conjugated organic systems has recently attracted tremendous interest due to its desirable optical, electronic and sensory properties. Compared with BN-, NBN- and BNB-doped polycyclic aromatic hydrocarbons, NBN-embedded polymers are poised to expand the diversity and functionality of olefin polymers, but this new class of materials remain underexplored. Herein, a series of polymers with BNB-doped pi-system as a pendant group were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization from NBN-containing vinyl monomers, which was prepared via intermolecular dehydration reaction between boronic acid and diamine moieties in one pot. Poly{2-(4-Vinylphenyl)-2,3-dihydro-1H-naphtho[1,8-de][1,3,2]diazaborinine} (P1), poly{N-(4-(1H-naphtho[1,8-de][1,3,2]diazaborinin-2(3H)-yl)phenyl)acrylamide} (P2) and poly{N-(4-(1H-benzo[d][1,3,2]diazaborol-2(3H)-yl)phenyl)acrylamide} (P3) were successfully synthesized. Their structure, photophysical properties and application in metal ion detection were investigated. Three polymers exhibit obvious solvatochromic fluorescence. As fluorescent sensors for the detection of Fe3+ and Cr3+, P1 and P2 show excellent selectivity and sensitivity. The limit of detection (LOD) achieved by Fe3+ is 7.30 nM, and the LOD achieved by Cr3+ is 14.69 nM, which indicates the great potential of these NBN-embedded polymers as metal fluorescence sensors.
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