7-Alkoxy-appended coumarin derivatives: synthesis, photo-physical properties, aggregation behaviours and current-voltage (-) characteristic studies on thin films

In this study, we designed and synthesised a series of coumarin derivatives appended with a long alkoxy chain on the seventh position of the coumarin-3-carboxylate/carboxylic acid core to make thin film materials. Synthesised compounds were characterized by their UV and fluorescence spectra in solut...

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Bibliographic Details
Published in:RSC advances 2021-03, Vol.11 (17), p.1212-1223
Main Authors: Rudra Paul, Abhijit, Dey, Bapi, Suklabaidya, Sudip, Hussain, Syed Arshad, Majumdar, Swapan
Format: Article
Language:English
Subjects:
Aggregates
Behavior
Carboxylic acids
Chains
Chemistry
Coumarin
Current voltage characteristics
Fluorescence
Functional groups
Molding materials
Morphology
Physical properties
Room temperature
Spin coating
Switching
Thin films
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Summary:In this study, we designed and synthesised a series of coumarin derivatives appended with a long alkoxy chain on the seventh position of the coumarin-3-carboxylate/carboxylic acid core to make thin film materials. Synthesised compounds were characterized by their UV and fluorescence spectra in solutions as well as their films prepared by both LB and spin-coated methods. The surface morphology and electrical behaviour of thin films were judged by AFM, SEM and I - V characteristic mapping respectively. Isotherm, UV-Vis absorption and fluorescence spectroscopic investigations revealed the formation of aggregates on thin films. The result of SEM and AFM images provides the information about the length and height of aggregates on the thin films of coumarin derivatives. From I - V characteristics, it was found that at room temperature, the spin-coated films of coumarin derivatives containing an ester functional group exhibited a threshold switching behaviour, whereas derivatives containing the carboxylic acid functional group showed both threshold and bipolar switching behaviours. We also noticed that the I - V characteristic features of synthesized materials depended on the length of the alkyl chain of individual series. In this article, we demonstrate the design, synthesis and physico-chemical characteristics, including electrical switching behaviours of long alkoxy-appended coumarin carboxylate/carboxylic acid in thin films.
ISSN:2046-2069
2046-2069
DOI:10.1039/d1ra00762a