MAGNETIC-FIELD EFFECTS ON THE RATES OF CL2- AND BR2- REACTIONS - THE DEPENDENCE OF THE RATES OF RADICAL DISPROPORTIONATION AND OXIDATION OF MN(II) COMPLEXES ON FIELD INTENSITY

Magnetokinetic effects on the rates of disproportionation of Cl2- and Br2- and on their reactions with Mn(OH2)62+ and Mn(EDTAH)- have been investigated as a function of the magnetic field intensity, B, between 0 and 6.5 T. The dependence of the rate constants on B has been rationalized in terms of the spin evolution in paired reactants. The isotropic hyperfine coupling-induced multiplet transitions and the DELTAg mechanism make significant contributions to such effects. Paramagnetic relaxation in the disproportionation of Br2- has been related to a partial quenching of the magnetic field effects at fields, B greater-than-or-equal-to 3T.