Electron transfer reactions in aqueous solutions of 2,2′-thiodiethanol: A pulse radiolysis study

Add time:08/23/2019    Source:sciencedirect.com

The transient optical absorption band (λmax=290 nm, ε = 2020 dm3mol−1cm−1) produced on pulse radiolysis of N2O saturated aqueous solution (pH = 6.0−10.0) of 2,2′-thiodiethanol (TDE) has been assigned to the product of reaction of OH radicals with the solute. It decayed by second order kinetics with bimolecular rate constant of 1.7 × 109 dm3 mol−1 s−1. The absolute rate constant for the reaction of OH radicals with the solute has been determined to be 1.4 × 1010 dm3 mol−1 s−1. The transient optical absorption band (λmax=505 nm, t12=35 μs, ε = 6255 dm3 mol−1 cm−1) formed on pulse radiolysis of O2 saturated aqueous solution of the solute (1.4 × 10−2moldm−3, pH = 1.5) has been assigned to dimer radical cation. Br−2 and Cl−2 are able to oxidize TDE with a bimolecular rate constant of 4.8 × 108 and 1.1 × 109 dm3 mol−1 s−1 respectively. The dimer radical cation of TDE oxidizes I− with a bimolecular rate constant of 3.6 × 109 dm3 mol−1 s−1.

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