Abstract
Unique fluorescence behavior was reported in room-temperature ionic liquids having imidazolium cations. Due to the molecular electronic energy level of the imidazolium cation, fluorescence in the visible range from pure ionic liquids is not expected, but was readily observed. Fluorescence correlation spectroscopy (FCS) was used to find the nature of this unique fluorescence by investigating the fluorescence fluctuation and the number density of fluorophores. FCS signal was observed in pure room-temperature ionic liquids having different cations and anions, which is considered to come from the molecular aggregate of room-temperature ionic liquid. The size and the number density of aggregates in pure ionic liquids were measured by using FCS.
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Cha, S., Kim, D. Fluorescence correlation spectroscopy study on room-temperature ionic liquids. Journal of the Korean Physical Society 61, 1555–1559 (2012). https://doi.org/10.3938/jkps.61.1555
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DOI: https://doi.org/10.3938/jkps.61.1555