Investigation of the reaction of Br 2 - and Fe(II) using laser pulsed photolysis

Conclusions The reaction of Br ₂ ^- with Fe _solv ²⁺ in a mixture of methanol with diethyl ether occurs according to a intrasphere mechanism with the primary product being the FeBr²⁺ complex. The rate constant (5.9 ± 0.5)-10⁷ dm³/mole·sec at 298 K is greater by a factor of 15–20 than in the reaction of Br ₂ ^- with Fe _aq ²⁺ , despite the slower rate of exchange of the solvent molecules for Fe ₂ ^- . In the latter case the reduced permittivity considerably increases the lifetime of partners in the contact pair state.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1247–1250, June, 1988.