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Electron Photodetachment From Iodide in Ionic Liquids Through Charge-Transfer-To-Solvent Band Excitation

Electron Photodetachment From Iodide in Ionic Liquids Through Charge-Transfer-To-Solvent Band Excitation

Ryuzi Katoh, Yoichi Yoshida, Yosuke Katsumura, Kenji Takahashi

J Phys Chem B. 2007 May 10;111(18):4770-4.

PMID: 17474702

Abstract:

Solvation of iodide and electrons in an ionic liquid (N,N,N-trimethyl-n-propylammonium bis(trifluoromethanesulfonyl)imide; TMPA-TFSI) was studied through the absorption spectra of the charge-transfer-to-solvent (CTTS) state of iodide and of solvated electrons. The interaction between the TMPA cation and iodide was strong, whereas electrons were weakly solvated in TMPA-TFSI. We followed electron photodetachment from iodide to the ionic liquid and formation of the solvated electrons by observing absorption in the visible and near-infrared regions using a nanosecond laser flash photolysis method. The quantum yield of the photodetachment in TMPA-TFSI was estimated to be 0.34, which is much higher than that in a high-concentration aqueous salt solution previously reported. We also examined a reaction of the solvated electrons with the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (Bmim-TFSI) as a solute in TMPA-TFSI. The reaction rate was determined to be 5.3 x 10(8) M(-1) s(-1). The electrons before full solvation (dry electrons) reacted with Bmim cations efficiently. These observations suggest that the electrons in TMPA-TFSI can move easily before solvation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP14488450	n-Propylammonium iodide		14488-45-0	Price

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