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Study of Mechanoluminescent and ‘Aggregation Induced Enhanced Emission’ Property of a New Conjugated polymer Containing Tetraphenylethylene in the backbone: Application in Selective and Sensitive Detection of Explosive

Abstract

Development of new conjugated polymers with ‘Aggregation induced emission (AIE)’ characteristics are of great interest in recent years to avoid the ‘aggregation caused quenching (ACQ)’ effect and their potential applications in PLEDs, chemo sensors and bio-imaging. In this work, we have developed a D-π-A based AIE conjugated polymer (PTPEThio) derived from tetraphenylethylene (TPE) building blocks by Wittig reaction. The electron rich bithiophene moiety as a donor and TPE as an acceptor linked with π conjugation alternates. This D-A alternates through π conjugation in polymer chain enables the intramolecular charge transfer or twisted intramolecular charge transfer (ICT/TICT) interaction between the D and A moieties. The computational studies of a single repeating unit of polymer support that transition is ICT/TICT. The structure of the synthesized compounds and polymer were characterized by FT-IR, NMR and GPC techniques with good results. The obtained polymer was readily soluble in common organic solvents such as chloroform, dichloromethane and tetrahydro furan etc. The polymer shows weak emission from a solution by dissolving it in a solvent and a strong emission as observed in the aggregated state resulting ‘Aggregation Induced Enhanced Emission (AIEE)’ characteristics. This is due to the restricted intramolecular rotation (RIR). PTPEThio polymer exhibits an abnormal blue shifted mechanoluminescent effect in contrary to the TPE derivatives which shows red-shifted emission. The causes of such transition in polymer has been investigated using PXRD and DSC techniques. In addition, PTPEThio has been successfully tested in sensing of picric acid through photoluminescence (PL) quenching.

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Publication details

The article was accepted on 12 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8PY01153B
Citation: Polym. Chem., 2018, Accepted Manuscript
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    Study of Mechanoluminescent and ‘Aggregation Induced Enhanced Emission’ Property of a New Conjugated polymer Containing Tetraphenylethylene in the backbone: Application in Selective and Sensitive Detection of Explosive

    D. Sengottuvelu and I. R. Laskar, Polym. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8PY01153B

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