Improvement of radiation resistance and an estimate of solvated electron yield of the ionic liquid [Bmim]Cl by the addition of FeCl(3).
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.
Huang
Wei
W
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China.
Chen
Shimou
S
Fu
Haiying
H
Wu
Guozhong
G
D002152:Calorimetry, Differential Scanning; D002712:Chlorides / Q000737:chemistry*; D003116:Color; D004307:Dose-Response Relationship, Radiation; D004583:Electrons; D005290:Ferric Compounds / Q000737:chemistry*; D005720:Gamma Rays; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013057:Spectrum Analysis; D013696:Temperature
D002712:Chlorides; D005290:Ferric Compounds; D007093:Imidazoles; D052578:Ionic Liquids; D012997:Solvents; C502841:1-butyl-3-methylimidazolium chloride; C024555:ferric chloride