3 years ago

Spectroscopic Studies on the Interaction of Dye and Surface Active Ionic Liquid

Spectroscopic Studies on the Interaction of Dye and Surface Active Ionic Liquid
Nitai Patra, Soumen Ghosh, Bithika Mandal
The interaction of both cationic dye Safranine T (ST) and anionic dye Congo red (CR) with anionic and cationic surface active ionic liquid 1-butyl-3-methyl imidazolium octyl sulfate ([BMIM][OS]) and 1-decyl-3-methyl imidazolium chloride ([DMIM][Cl]) was investigated by absorbance and emission spectroscopy, time-resolved fluorescence study, and anisotropy methods at premicellar and postmicellar regions. The interaction of dye with both of the ionic liquids occurred electrostatically as well as hydrophobically. In the case of ST, initially absorbance decreases up to a certain concentration without any shift of λmax, and then it increases with red shift of λmax. Absorption spectra of CR gave red-shifted wavelength with addition of [BMIM][OS], but at a higher concentration of surface active ionic liquid (SAIL), no shifting was observed. Again, blue-shifted λmax was found in lower range of [DMIM][Cl]; but at higher concentration, it was further red-shifted. Emission intensity increases in both dye–SAIL systems; for ST in both SAIL media, blue-shifted spectra were observed, but there was no shift of emission maxima in case of CR in those media. Dye–IL binding ratio, binding sites, and binding constants were also calculated from fluorescence measurements. Anisotropy measurement showed that movement of dye in pre- and postmicellar regions was different in different SAIL systems. Time-resolved fluorescence lifetime confirmed microenvironment of dye–SAIL systems.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02052

DOI: 10.1021/acs.iecr.7b02052

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.