Modification of the photophysics of 3-hydroxyflavone in aqueous solutions of imidazolium-based room temperature ionic liquids: a comparison between micelle-forming and non micelle-forming ionic liquids

Ghosh, Saptarshi ; Chattopadhyay, Nitin (2015) Modification of the photophysics of 3-hydroxyflavone in aqueous solutions of imidazolium-based room temperature ionic liquids: a comparison between micelle-forming and non micelle-forming ionic liquids RSC Advances, 5 . pp. 49054-49061. ISSN 2046-2069

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Official URL: http://pubs.rsc.org/EN/content/articlelanding/2015...

Related URL: http://dx.doi.org/10.1039/C5RA03833B

Abstract

In the present article, we have investigated the photophysical behavior of 3-hydroxyflavone (3HF), an excited state intramolecular proton transfer (ESIPT) probe, in aqueous solutions of two imidazolium-based room temperature ionic liquids (RTILs), one micelle-forming and the other non micelle-forming, exploiting steady state and time resolved fluorometric techniques. The study unveils that the ESIPT process of 3HF is modified substantially in the micelle-forming RTIL as compared to that in the other RTIL. The critical micellar concentration (CMC) of the micelle-forming RTIL has been determined from both steady state and time resolved data. The study suggests that 3HF resides within the micellar phase and experiences a significantly less polar environment in its vicinity than in the non micelle-forming ionic liquid. A comparative study with the probe in the micelle-forming ionic liquid and a conventional anionic surfactant of a similar hydrophobic chain length reveals that 3HF experiences an appreciably less polar environment in the RTIL micelle as compared to the conventional anionic micelle.

Item Type:Article
Source:Copyright of this article belongs to Royal Society of Chemistry.
ID Code:99047
Deposited On:05 Aug 2015 11:51
Last Modified:05 Aug 2015 11:51

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