Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Acridine Fluorescence Behaviors in Different Polymeric Microenvironments Directed by C2-Proton-Acidity of Imidazolium-Based Ionic Liquids

  • Ji, Myoung-Jin (Department of Chemistry, Dankook University) ;
  • Kim, Jong-Gyu (Department of Chemistry, Dankook University) ;
  • Shin, Ueon-Sang (Institute of Tissue Regeneration Engineering (ITREN), Dankook University)
  • Received : 2012.03.16
  • Accepted : 2012.04.24
  • Published : 2012.08.20
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Abstract

A new fluorescent system (acridine/RTIL hybrid gel) confined in the 3D micro-structure of a poly(lactic acid) membrane were prepared from 1-butyl-3-methylimidazolium-based ionic liquids ([bmim]X (X = $SbF_6$, $NTf_2$, Cl); RTILs), poly(lactic acid) (PLA), and acridine via the sol-gel route. SEM images showed that, in the presence of [bmim]$SbF_6$ and [bmim]$NTf_2$, 3D-ly paticulated structures were created inside the PLA membranes and acridine/RTIL hybrid gels were confined in gabs of particulates. However, the use of [bmim]Cl induced the formation of a 3D-ly porous structure containing the hybrid gel of acridine/[bmimCl in the micropores. The three fluorescent systems exhibited different fluorescence behaviors (fluorescence maximum and intensity) depending on the C2-H acidity scale of the RTILs (or their anion type). Acridine gels hybridized with [bmim]$SbF_6$ and [bmim]$NTf_2$ showed blue fluorescence with relative high intensity, whereas the hybrid gel with [bmim]Cl exhibited almost no fluorescence under dry conditions. However, the acridine/[bmim]Cl hybrid system in the micro-porous PLA membrane started to emit fluorescent light under humid conditions and showed a possible response, indicating that it could be applied as a humidity sensor.

Keywords

References

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