Charge Transfer to Solvent Reaction in Hydrophobic Tetrabutylammonium Iodide Molecular Layer in Aqueous Solution.

Author(s) Karashima, S.; Suzuki, T.
Journal J Phys Chem B
Date Published 2019 Mar 04
Abstract

We present ultrafast photoelectron spectroscopy of the charge-transfer-to-solvent (CTTS) reaction in the segregated TBAI (tetrabutylammonium iodide) molecular layer in aqueous solution. The reaction times and electron binding energies of transient species vary with TBAI concentration from very low value of 1 × 10-3 mol L-1, which is contrasted with NaI solution exhibiting no concentration (0.01 - 1.0 mol L-1) dependence. The result from soft X-ray N(1s) spectroscopy indicates that the photoelectron intensity in TBAI aqueous solution is about 70 times enhanced as compared to that in NH4Cl aqueous solution for identical salt concentration, and TBA+ drags I- to the surface region. At high TBAI concentration, electrons released from I- are trapped and held in the TBAI molecular layer for more than 300 ps, indicating the presence of a potential barrier for electron migration from the TBAI layer to bulk water.

DOI 10.1021/acs.jpcb.8b12210
ISSN 1520-5207
Citation Karashima S, Suzuki T. Charge Transfer to Solvent Reaction in Hydrophobic Tetrabutylammonium Iodide Molecular Layer in Aqueous Solution. J Phys Chem B. 2019.

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