Facile synthesis of alkylated phenothiazine-isatin polymers by super acid catalyst: Effect of alkyl chain length on the properties

•Facile polymerization of alkylated phenothiazine and isatin by super acid at ambient condition.•Effects of alkyl chain on the different properties of polymers were explored.•Comparison of alkylated and non-alkylated phenothiazine and isatin polymer was investigated.•Alkyl chain plays a key role to...

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Bibliographic Details
Published in:Journal of molecular structure 2021-10, Vol.1242, p.130714, Article 130714
Main Authors: Kasi, Bharatraj, Kaliaperumal, Neelakandan, Murugesan, Vajjiravel
Format: Article
Language:English
Subjects:
Donor-acceptor
Effect of alkyl chain
Polymers of isatin and phenothiazine
Super acid catalyst
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Summary:•Facile polymerization of alkylated phenothiazine and isatin by super acid at ambient condition.•Effects of alkyl chain on the different properties of polymers were explored.•Comparison of alkylated and non-alkylated phenothiazine and isatin polymer was investigated.•Alkyl chain plays a key role to improve property and performance of polymers. In this work, we synthesized series of polymers (P1 – P4) having two different alkyl side-chains linked in phenothiazine-isatin (PTz-IS) moieties using super acid (trifluoromethanesulfonic acid) catalyst at ambient condition. The effects of alkyl chain length on the polymers of phenothiazine (electron-donating moiety) and isatin (electron-withdrawing moiety) were investigated and compared without side chain of their counterpart. Synthesized alkylated P1 - P4 showed very good solubility in all common organic solvents and forms smooth film on glass substrate on compared to non-alkylated polymers. P1 – P4 were fully analyzed by FT-IR, 1H NMR, TGA, UV-Visible, fluorescence and cyclic voltammetry techniques. An alkylated and non-alkylated polymer was possessing thermal stability of 244°C and 300 °C respectively. The absorbance and emission maximum of alkylated and non-alkylated polymers based on phenothiazine –isatin was showed at 561, 637 nm and 557, 630 nm respectively. Likewise the all the properties was compared and discussed with proper explanation. From the obtained results, P1-P4 could be suitable materials for optoelectronics device and other relevant applications. [Display omitted]
ISSN:0022-2860
1872-8014
DOI:10.1016/j.molstruc.2021.130714