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Novel Functional TPE Polymers: Aggregation-Induced Emission, pH Response, and Solvatochromic Behavior
Wei Huang1, Markus Bender1, Kai Seehafer1
1Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany.
Macromolecular Rapid Communications
|December 4, 2018
Summary
New tetraphenylethylene (TPE) polymers with amino or nitro groups exhibit aggregation-induced emission (AIE). Amino-functionalized TPE polymers show promising pH-responsive and nitroarene-sensing capabilities.
Area of Science:
- Polymer Chemistry
- Materials Science
- Organic Electronics
Background:
- Aggregation-induced emission (AIE) is a photophysical phenomenon where molecules exhibit enhanced fluorescence upon aggregation.
- Tetraphenylethylene (TPE) is a well-known fluorophore that exhibits AIE.
- Functionalization of TPE-based polymers can tune their optical properties and sensing capabilities.
Purpose of the Study:
- To synthesize and characterize novel TPE-based aryleneethynylene polymers functionalized with amino or nitro groups.
- To investigate the aggregation-induced emission (AIE) properties of these polymers.
- To explore their potential as pH-responsive materials and sensors for nitroarenes.
Main Methods:
- Synthesis of four TPE-based aryleneethynylene polymers with varying amino and nitro group positions.
- Characterization of photophysical properties, including AIE, acidochromism, and solvatochromism.
- Evaluation of nitroarene-sensing performance using fluorescence spectroscopy.
- Development of a sensor array for identifying nitroarenes in aqueous media.
Main Results:
- All synthesized polymers displayed strong AIE characteristics.
- Amino-substituted polymers (P1-P3) exhibited pH-dependent fluorescence changes due to protonation.
- The position of amino groups influenced fluorescence intensity and emission wavelength.
- Nitro-substituted polymer (P4) showed solvatochromic behavior.
- Amino-functionalized polymers demonstrated high sensitivity and selectivity for nitroarene detection.
- A sensor array based on P1-P3 successfully identified 12 different nitroarenes in water.
Conclusions:
- The functional groups (amino and nitro) significantly impact the photophysical properties and sensing applications of TPE-based polymers.
- Amino-functionalized TPE polymers are effective fluorescent sensors for pH and nitroarenes.
- The developed sensor array offers a promising platform for detecting multiple nitroaromatic compounds.
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