Here we report on the spectra and solvation dynamics of the excess electron in the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, P14/NTf2 using nanosecond pulse radiolysis.  Figure shows experimental (markers) and fitted (lines) optical density decays at 300 nm (black) and 900 nm (red) in P14/NTf2 saturated with Ar (a), N2O (b) and H2 (c). The decays at 900 nm in Ar saturated P14/NTf2 (a) show the electron follows a first-order process with a lifetime of 280 ns. Scavenging experiments allowed us to record and disentangle the complex spectrum measured in P14/NTf2. Scavenging experiments with N2O shows that decay kinetics at 300 nm is the same as that at 900 nm, indicating that the absorption signal at 300 nm can be attribute to the solvated electron.We also measured yield of solvated electron under several low temperatures. The yield decreased with decreasing temperature. This can be considered as the slow solvation dynamics of ionic liquid around the excess electron at low temperature. In other words, electrons produced after ionization of ionic liquid may have much of chance to cause reaction before fully solvated by surrounded ionic liquid molecules.

Spectra and solvation dynamics of excess electron in ionic liquids

248th National Meeting (2014)

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