Cr(4,4'-Me2bpy)33+ excited state quenched by O2

Cr(4,4'-Me₂bpy)₃³⁺ quenched by O₂ at conc. (2.5, 12) x 10^–4 mol L^–1
Solvent : H₂O, 1 mol/L HCl, 25ºC

k_q = 4.2 x 10⁷(L mol^–1 s^–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 180 micro sec. (laser flash, luminescence, multiple shot with signal averaging)

Cr(4,4'-Me₂bpy)₃³⁺ quenched by O₂ at conc. (2.5, 12) x 10^–4 mol L^–1
Solvent : H₂O, 1 mol/L HCl, 25ºC

k_q = 3.4 x 10⁷(L mol^–1 s^–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 230 micro sec. (conventional flash, absorption, single shot signal)
This value also reported in 78A388