Tribological behavior and quantum chemical calculations of protic ionic liquids: synthesis, spectroscopic, and thermal properties

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KARADAĞ A., Akbas H., KARAKAŞ D., Tekin K. C., Korkmazer E.

TURKISH JOURNAL OF CHEMISTRY, vol.43, no.3, pp.766-786, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 3
  • Publication Date: 2019
  • Doi Number: 10.3906/kim-1809-56
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.766-786
  • Yozgat Bozok University Affiliated: Yes


Protic ionic liquids (PILs) were synthesized through a stoichiometric neutralization reaction between 2,2'-(ethylenedioxy)-bis(ethylamine) {Edbea} and various acids (formic, acetic, boric, decanoic, and gentisic acid). The PILs were characterized by elemental analyses, FTIR, H-1 and C-13 NMR spectroscopy, and thermogravimetric analysis. All the PILs except PIL3 were liquid at room temperature. The viscosity of the PILs (PIL1, 2, 4, 5) was measured using a cone-and-plate viscometer at ambient temperature. Quantum chemical calculations were used to explain the cation/anion ratio in the PILs. Reaction energies in the gas phase calculated at M062X/6-311+G(d,p) level were used to determine the cation/anion ratio. A sliding wear test was conducted at room temperature using an AA7075 disc specimen against a stationary 100Cr6 steel ball. The wear protection of PILs and 15W40 engine oil was determined by considering the volume loss of AA7075.