Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis of Hydrophobic Imidazolium Ionic Liquids and Studies of Their Physiochemical Properties

소수성의 이미다졸리움 이온성 액체 합성과 이들의 물리화학적 특성 조사

  • Salman, Muhammad (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Lee, Sooyoung (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University) ;
  • Lee, Hye Jin (Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University)
  • 무함마드 살만 (경북대학교 자연과학대학 화학과 및 청정나노소재 연구소) ;
  • 이수영 (경북대학교 자연과학대학 화학과 및 청정나노소재 연구소) ;
  • 이혜진 (경북대학교 자연과학대학 화학과 및 청정나노소재 연구소)
  • Received : 2021.03.16
  • Accepted : 2021.04.12
  • Published : 2021.06.10
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Abstract

Two hydrophobic imidazolium based ionic liquids including 1-benzyl-3-butylimidazolium hexafluorophosphate [BzBIM]PF6 and 1-pentyl-3-butylimidazolium hexafluorophosphate [PBIM]PF6 having the same anion and different cation parts were synthesized. The structural composition of these ionic liquids were confirmed with Fourier-transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance (1H-NMR). Their physiochemical properties such as viscosity, ionic conductivity and thermal stability alongside electrochemical potential window range for both ionic liquid electrolytes were characterized and compared to each other. The overall results revealed that [BzBIM]PF6 has higher thermal and electrochemical stabilities and viscosity than that of [PBIM]PF6 probably due to the presence of benzyl ring in the imidazolium cation providing strong intermolecular π-π interactions.

본 연구에서는 PF6를 음이온으로 하며, 이미다졸리움 계열의 양이온을 변화시키면서 2종의 소수성을 띠는 이온성 액체 전해질을 합성하였다. 합성한 이온성 액체는 1-benzyl-3-butylimidazolium hexafluorophosphate [BzBIM]PF6와 1-pentyl-3-butylimidazolium hexafluorophosphate [PBIM]PF6이며 이들 각각의 구조는 푸에리에 변환 적외선 분광기와 핵자기공명 분광기를 이용하여 분석하였다. 이와 함께, 합성한 이온성 액체 전해질의 물리적(점도, 이온전도도, 열적 안정성) 및 전기화학적 특성을 조사하고 비교 분석하였다. 그 결과, [BzBIM]PF6의 경우 [PBIM]PF6와 다르게 이미다졸리움 양이온에 π-π 분자 간 결합이 강하게 존재하는 벤질링 기능기를 가지고 있어서 열적 및 전기화학적 특성에서 더 우세한 안정성을 보여주었다.

Keywords

Acknowledgement

This research was supported by Korea Electric Power Corporation (Grant number: R20XO02-24).

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