A kinetic and mechanistic study of the reaction between bis-p-ethoxyphenyl ditelluride and molecular iodine in solution
Abstract
The title reaction in toluene has been examined spectrophotometrically. The data are consistent with equations (1)–(3)(R =p-EtOC6H4). The rate constants k1 and k3 are 56 ± 2 dm3 mol–1 s–1 at R2Te2+ [graphic omitted] 2RTel (1) RTel + I2 [graphic omitted] RTe(I3)(2) RTe(I3) [graphic omitted] RTel(I)3(3) 7 °C and 6.2 × 10–4 s–1 at 25 °C, respectively. The equilibrium constant K2 is 1 570 dm3 mol–1 at 25 °C, and ΔH2=–22 ± 4 kJ mol–1. The activation parameters for the final step are ΔH‡= 44 ± 5 kJ mol–1 and ΔS‡=–160 ± 15 J K–1 mol–1.