Kinetics of the reversible recombination of substituted 2-(p-dimethylaminophenyl)indane-1,3-dion-2-yl radicals

Abstract

1. We established linear relationships between Δ log 2k−1, Δ log 2k1, and Σσ of the Gammet constants with a positive ρ value, equal to 0.32 and 1.20, respectively. 2. We determined the kinetic and thermodynamic parameters of the recombination reaction of radicals and of the dissociation of dimers in the 2-arylindanedione-1,3 series. 3. The recombination rate constant of 2-arylindane-1,3-dion-2-yl radicals in benzene is activational. In the binary benzene-MO mixture at η≥2sP, the recombination rate constant is fully limited by molecular mobility. In the case of recombination of 5-iodo-2-(p-dimethylaminophenyl) indane-1,3-dion-2-yl radicals, we found that 2k−1 ∼ η−0.5.