Abstract
Pyrene has been used as a probe molecule to investigate the interactions in the mixture of the ionic liquid N-butylpyridinium tetrafluoroborate ([BPy][BF4]) and acetonitrile (MeCN) by ultraviolet–visible (UV–vis) spectroscopy. The results show that an obvious red-shift of characteristic absorption spectra of pyrene was observed with the adding of [BPy][BF4] to its acetonitrile solution. The position of absorption peaks was only relative to the fraction of [BPy][BF4] and almost did not change with the concentration of pyrene. When measurements were carried out in other ionic liquids, similar results were obtained. However, the hyperchromic effect was observed in [BPy][BF4] and the hypochromic effect was observed in [BPy][NTf2] (N-butylpyridinium bis((trifluoromethyl)sulfonyl)imide) for the maximum absorption peak near 335nm. The local microstructure transformation of [BPy][BF4]/MeCN mixed solutions could be indicated by results for the electrical conductivity and viscosity. It was concluded that the red-shift was induced not only by the polarity change of the solution but also by the local microstructure and the solvent–solute interaction.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
