Ru(bpy)32+ excited state quenched by Co(NH3)5Br2+

Ru(bpy)₃²⁺ quenched by Co(NH₃)₅Br²⁺ at conc. <= 0.002 mol L^–1
Solvent : H₂O, 0.5 mol/L H₂SO₄, 25ºC

k_q = 2.5 x 10⁹(L mol^–1 s^–1)

Mechanism: oxidative electron transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 0.60 micro sec. (laser flash, luminescence, single photon counting)

Ru(bpy)₃²⁺ quenched by Co(NH₃)₅Br²⁺
Solvent : H₂O/2-PrOH (1/1), 0.5 mol/L H₂SO₄, 25ºC

k_q = 1.1 x 10⁹(L mol^–1 s^–1)

Mechanism: oxidative electron transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 0.87 micro sec. (laser flash, luminescence, single photon counting)