When Ru(NH3)5Me2SO2+ is oxidized to the 3+ state, S → O isomerization takes place at a specific rate of (7.0 ± 0.5) × 10-2 s-1 (24 × 10-2 s-1 for the methioninesulfonate complex). Aquation is quite slow, kaq being 7.7 × 10-5 s-1 (6.2 × 10-5 s-1). On reduction to the 2+ state, O → S isomerization takes place, the values of kism being 30 ± 7 s-1 (99 ± 7 s-1). Aquation accompanies isomerization in the 2+ species and kaq ? = 10 s-1 (30 s-1). The shift from the S- to the O-bound form changes the 3+/2+ reduction potential from 1.0 to 0.01 V. ? 1982 American Chemical Society.
