Abstract
A cationic conjugated polyelectrolyte was designed and synthesized based on poly(fluorene-co-phenylene) containing 5 mol% benzothiadiazole (BT) as a low energy trap and 15-crown-5 as a recognizing group for potassium ions. A potassium ion can form a sandwich-type 2:1 Lewis acid-based complex with 15-crown-5, to cause the intermolecular aggregation of polymers. This facilitates inter-chain fluorescence resonance energy transfer (FRET) to a low-energy BT segment, resulting in fluorescent signal amplification, even at dilute analyte concentrations. Highly sensitive and selective detection of K+ ions was demonstrated in water. The linear response of ratiometric fluorescent signal as a function of [K+] allows K+ quantification in a range of nanomolar concentrations with a detection limit of ≈0.7 × 10-9 M.
| Original language | English |
|---|---|
| Pages (from-to) | 772-778 |
| Number of pages | 7 |
| Journal | Macromolecular Rapid Communications |
| Volume | 34 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2013 May 14 |
| Externally published | Yes |
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Keywords
- aggregation
- chemosensor
- crown ether
- fluorescence
- potassium
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry
Cite this
Ratiometric fluorescent ion detection in water with high sensitivity via aggregation-mediated fluorescence resonance energy transfer using a conjugated polyelectrolyte as an optical platform. / Le, Van Sang; Kim, Boram; Lee, Wonho; Jeong, Ji Eun; Yang, Renqiang; Woo, Han Young.
In: Macromolecular Rapid Communications, Vol. 34, No. 9, 14.05.2013, p. 772-778.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ratiometric fluorescent ion detection in water with high sensitivity via aggregation-mediated fluorescence resonance energy transfer using a conjugated polyelectrolyte as an optical platform
AU - Le, Van Sang
AU - Kim, Boram
AU - Lee, Wonho
AU - Jeong, Ji Eun
AU - Yang, Renqiang
AU - Woo, Han Young
PY - 2013/5/14
Y1 - 2013/5/14
N2 - A cationic conjugated polyelectrolyte was designed and synthesized based on poly(fluorene-co-phenylene) containing 5 mol% benzothiadiazole (BT) as a low energy trap and 15-crown-5 as a recognizing group for potassium ions. A potassium ion can form a sandwich-type 2:1 Lewis acid-based complex with 15-crown-5, to cause the intermolecular aggregation of polymers. This facilitates inter-chain fluorescence resonance energy transfer (FRET) to a low-energy BT segment, resulting in fluorescent signal amplification, even at dilute analyte concentrations. Highly sensitive and selective detection of K+ ions was demonstrated in water. The linear response of ratiometric fluorescent signal as a function of [K+] allows K+ quantification in a range of nanomolar concentrations with a detection limit of ≈0.7 × 10-9 M.
AB - A cationic conjugated polyelectrolyte was designed and synthesized based on poly(fluorene-co-phenylene) containing 5 mol% benzothiadiazole (BT) as a low energy trap and 15-crown-5 as a recognizing group for potassium ions. A potassium ion can form a sandwich-type 2:1 Lewis acid-based complex with 15-crown-5, to cause the intermolecular aggregation of polymers. This facilitates inter-chain fluorescence resonance energy transfer (FRET) to a low-energy BT segment, resulting in fluorescent signal amplification, even at dilute analyte concentrations. Highly sensitive and selective detection of K+ ions was demonstrated in water. The linear response of ratiometric fluorescent signal as a function of [K+] allows K+ quantification in a range of nanomolar concentrations with a detection limit of ≈0.7 × 10-9 M.
KW - aggregation
KW - chemosensor
KW - crown ether
KW - fluorescence
KW - potassium
UR - http://www.scopus.com/inward/record.url?scp=84877268410&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84877268410&partnerID=8YFLogxK
U2 - 10.1002/marc.201200811
DO - 10.1002/marc.201200811
M3 - Article
C2 - 23417971
AN - SCOPUS:84877268410
VL - 34
SP - 772
EP - 778
JO - Macromolecular Rapid Communications
JF - Macromolecular Rapid Communications
SN - 1022-1336
IS - 9
ER -