The Optical Absorption Spectrum of the Solvated Electron in Polar Liquids and in Binary Solutions

Spectrum and Reactivity of the Solvated Electron in the Ionic Liquid Methyltributylammonium Bis(trifluoromethylsulfonyl)imide

“…Using the reported extinction coefficient 31 of the pyrene anion (5.0 × 10 4 L mol -1 cm -1 ) and correcting 36 for solvated electron absorbance at 490 nm, the extinction coefficient of the solvated electron in R 4 NNTf 2 is 1.6 × 10 4 L mol -1 cm -1 at 1030 nm and the maximum extinction coefficient is 2.2 × 10 4 L mol -1 cm -1 at 1410 nm. The peak extinction coefficient is comparable to those observed 20 for the electron in ethylenediamine and propanediamine (2.0 × 10 4 to 2.2 × 10 4 L mol -1 cm -1 ) in the same region. The extinction coefficient of the 1450 nm band of the solvated electron in acetonitrile was reported 37 to be 2.3 × 10 4 L mol -1 cm -1 although recent work 22 on the equilibrium between the solvated electron species responsible for the 1450 nm band and the anionic species associated with the absorption band at 530 nm suggests that the true 1450 nm extinction coefficient may be as large as 5.3 × 10 4 L mol -1 cm -1 .…”

“…The maximum of the solvated electron absorption spectrum in R 4 NNTf 2 (1410 nm) occurs at much longer wavelengths than in water (715 nm) and alcohols (580-820 nm), but not as low energy as in ammonia (1850 nm) and simple alkylamines (1900-1950 nm). 19 Similar absorption maxima have been reported for alkyldiamines such as ethylenediamine, and 1,2and 1,3-propanediamine (1360, 1500, and 1500 nm, respectively) 20,21 as well as acetonitrile (1450 nm). 19,22 Electron Capture by Aromatic Acceptors.…”