Micelle-Induced Versatile Performance of Amphiphilic Intramolecular Charge-Transfer Fluorescent Molecular Sensors
A series of amphiphilic intramolecular charge‐transfer fluorescent molecular sensors AS1–3, equipped with a rod‐shaped hydrophobic 2‐phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg2+‐ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sod...
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| Published in | Chemistry : a European journal Vol. 13; no. 26; pp. 7543 - 7552 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Weinheim
WILEY-VCH Verlag
01.01.2007
WILEY‐VCH Verlag Wiley |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0947-6539 1521-3765 |
| DOI | 10.1002/chem.200700435 |
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| Abstract | A series of amphiphilic intramolecular charge‐transfer fluorescent molecular sensors AS1–3, equipped with a rod‐shaped hydrophobic 2‐phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg2+‐ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor–Hg2+ complexation, by using both UV/visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg2+‐ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg2+‐ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1–3, the original “on–off” response of AS2 toward the Hg2+ ion is transformed into a self‐calibrated two‐wavelength ratiometric signal, while for AS3, Hg2+‐ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg2+‐ion identification could be achieved by using the SDS‐induced fingerprint emission (358 nm) of the AS2–Hg2+ complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution.
What a performance! The SDS micelle significantly elevates the performance of amphiphilic intramolecular charge‐transfer fluorescent molecular sensors (see picture). Enhanced sensitivity, desirable spectral changes including “on–off” to ratiometric signal transformation, a thermocontrolled dynamic detection range, and highly specific analyte identification by the fingerprint emission of an analyte–sensor complex have been observed. |
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| AbstractList | A series of amphiphilic intramolecular charge-transfer fluorescent molecular sensors AS1-3, equipped with a rod-shaped hydrophobic 2-phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg2+-ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor-Hg (2+) complexation, by using both UV/ visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg2+-ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg2+-ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1-3, the original "on-off" response of AS2 toward the H g(2+) ion is transformed into a self-calibrated two-wavelength ratiometric signal, while for AS3, Hg2+ -ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg2+-ion identification could be achieved by using the SDS-induced fingerprint emission (358 nm) of the AS2-Hg2+ complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution. A series of amphiphilic intramolecular charge-transfer fluorescent molecular sensors AS1-3, equipped with a rod-shaped hydrophobic 2-phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg(2+)-ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor-Hg(2+) complexation, by using both UV/visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg(2+)-ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg(2+)-ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1-3, the original "on-off" response of AS2 toward the Hg(2+) ion is transformed into a self-calibrated two-wavelength ratiometric signal, while for AS3, Hg(2+)-ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg(2+)-ion identification could be achieved by using the SDS-induced fingerprint emission (358 nm) of the AS2-Hg(2+) complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution.A series of amphiphilic intramolecular charge-transfer fluorescent molecular sensors AS1-3, equipped with a rod-shaped hydrophobic 2-phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg(2+)-ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor-Hg(2+) complexation, by using both UV/visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg(2+)-ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg(2+)-ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1-3, the original "on-off" response of AS2 toward the Hg(2+) ion is transformed into a self-calibrated two-wavelength ratiometric signal, while for AS3, Hg(2+)-ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg(2+)-ion identification could be achieved by using the SDS-induced fingerprint emission (358 nm) of the AS2-Hg(2+) complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution. A series of amphiphilic intramolecular charge‐transfer fluorescent molecular sensors AS1–3, equipped with a rod‐shaped hydrophobic 2‐phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg2+‐ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor–Hg2+ complexation, by using both UV/visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg2+‐ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg2+‐ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1–3, the original “on–off” response of AS2 toward the Hg2+ ion is transformed into a self‐calibrated two‐wavelength ratiometric signal, while for AS3, Hg2+‐ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg2+‐ion identification could be achieved by using the SDS‐induced fingerprint emission (358 nm) of the AS2–Hg2+ complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution. What a performance! The SDS micelle significantly elevates the performance of amphiphilic intramolecular charge‐transfer fluorescent molecular sensors (see picture). Enhanced sensitivity, desirable spectral changes including “on–off” to ratiometric signal transformation, a thermocontrolled dynamic detection range, and highly specific analyte identification by the fingerprint emission of an analyte–sensor complex have been observed. A series of amphiphilic intramolecular charge-transfer fluorescent molecular sensors AS1-3, equipped with a rod-shaped hydrophobic 2-phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg(2+)-ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor-Hg(2+) complexation, by using both UV/visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg(2+)-ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg(2+)-ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1-3, the original "on-off" response of AS2 toward the Hg(2+) ion is transformed into a self-calibrated two-wavelength ratiometric signal, while for AS3, Hg(2+)-ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg(2+)-ion identification could be achieved by using the SDS-induced fingerprint emission (358 nm) of the AS2-Hg(2+) complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution. A series of amphiphilic intramolecular charge‐transfer fluorescent molecular sensors AS1–3, equipped with a rod‐shaped hydrophobic 2‐phenylbenzoxazole fluorophore and a hydrophilic tetraamide Hg 2+ ‐ion receptor, have been prepared. These sensor molecules could be incorporated into the hydrophobic sodium dodecyl sulfate (SDS) micelle, which is confirmed by the clear spectral blue shift and emission enhancement observed at the critical micelle concentration of SDS. Systematic examination of the sensor–Hg 2+ complexation, by using both UV/visible and fluorescence spectroscopy, indicates that SDS significantly modulates both the binding event and signal transformation of these sensor molecules. The potential advantages are fourfold: 1) SDS substantially increases the Hg 2+ ‐ion association constant and results in an amplified sensitivity. 2) SDS initiates spectral features which facilitate Hg 2+ ‐ion analysis, for example, in addition to the strengthened fluorescence of the free sensors AS1–3, the original “on–off” response of AS2 toward the Hg 2+ ion is transformed into a self‐calibrated two‐wavelength ratiometric signal, while for AS3, Hg 2+ ‐ion complexation in the presence of SDS results in a 180 nm blue shift, which is preferred to the 51 nm spectral shift obtained without SDS. 3) Thermoreversible tuning of the dynamic detection range is realized. 4) Highly specific Hg 2+ ‐ion identification could be achieved by using the SDS‐induced fingerprint emission (358 nm) of the AS2–Hg 2+ complex. Altogether, this work demonstrates a convenient and powerful strategy that remarkably elevates the performance of a given fluorescent molecular sensor. It also implies that for a specific utilization, much attention should be paid to the microenvironment in which the sensor resides, as the behavior of the sensor might be different from that in the bulk solution. |
| Author | Xu, Yufang Qian, Xuhong Wang, Jiaobing Qian, Junhong |
| Author_xml | – sequence: 1 givenname: Jiaobing surname: Wang fullname: Wang, Jiaobing organization: State Key Laboratory of Bioreactor Engineering and Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China – sequence: 2 givenname: Xuhong surname: Qian fullname: Qian, Xuhong email: xhqian@ecust.edu.cn organization: State Key Laboratory of Bioreactor Engineering and Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China – sequence: 3 givenname: Junhong surname: Qian fullname: Qian, Junhong organization: State Key Laboratory of Bioreactor Engineering and Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China – sequence: 4 givenname: Yufang surname: Xu fullname: Xu, Yufang organization: State Key Laboratory of Bioreactor Engineering and Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/17582820$$D View this record in MEDLINE/PubMed |
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| Copyright | Copyright © 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim |
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| Keywords | RECOGNITION mercury CATION-BINDING CONJUGATED POLYMER micelles charge transfer MERCURY IONS HG2 sensors SPECTROSCOPY fluorescence CHEMISTRY MEDIA SPECTRA MODULATION |
| Language | English |
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| SubjectTerms | charge transfer Chemistry Chemistry, Multidisciplinary fluorescence Fluorescent Dyes - chemistry Indicators and Reagents Magnetic Resonance Spectroscopy mercury Mercury - chemistry Micelles Physical Sciences Science & Technology sensors Sodium Dodecyl Sulfate - chemistry Solvents Spectrometry, Fluorescence Spectrophotometry, Ultraviolet Surface-Active Agents - chemistry Temperature |
| Title | Micelle-Induced Versatile Performance of Amphiphilic Intramolecular Charge-Transfer Fluorescent Molecular Sensors |
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