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  • Title: Improvement of radiation resistance and an estimate of solvated electron yield of the ionic liquid [Bmim]Cl by the addition of FeCl(3).
    Author: Huang W, Chen S, Fu H, Wu G.
    Journal: Radiat Res; 2010 Nov; 174(5):650-7. PubMed ID: 20726704.
    Abstract:
    The radiation stability of the ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl) was investigated after (60)Co γ irradiation at doses up to 600 kGy. Thermal and spectroscopic analysis revealed the formation of a small quantity of radiolytic products and an evident change in the physicochemical properties of the ionic liquid. The presence of anionic FeCl(4)(-) (up to 5 mol%), as measured by UV-vis absorption, differential scanning calorimetry, and Raman spectroscopy, significantly improved the radiation resistance of [Bmim]Cl. The increased resistance may be due to the capture of a solvated electron (e(solv)(-)) by FeCl(4)(-) to form FeCl(4)(2-) and results in the radiation protection of the organic cation. The radiation yield of the reductive species (Fe(II)) was estimated to be 0.217 ± 0.010 µmol/J (2.09 ± 0.10/100 eV), which is considered close to the radiation yield of the solvated electrons of [Bmim]Cl.
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