Radiolytic reduction of ethylene trithiocarbonate: A pulse radiolysis study

The reaction of e^-_aq with ethylene trihiocarbonate in aqueous medium has been investigated employing pulse radiolysis technique. The bimolecular rate constant for the reaction has been obtained as 3×10¹⁰dm³mol⁻¹s⁻¹. A transient absorption spectrum, with λ_max at 315 nm, has been observed which is assigned to the neutral radical formed by the protonation of radical anion produced in the reaction of e^-_aq with ETTC. A similar absorption spectrum was also observed under the condition where the H atom instead of e^-_aq reacts with ETTC. The transient decayed by second-order kinetics with k₂=(9.1±1.0) ×10⁸ dm³ mol⁻¹ s⁻¹. The G(-ETTC) has been determined from ⁶⁰Co λ-radiolysis as 3.1.