Cr(bpy)33+

excited state quenched by O2
Maestri, M.; Bolletta, F.; Moggi, L.; Balzani, V.; Henry, M.S.; Hoffman, M.Z.
J. Am. Chem. Soc. 100: 2694-701 (1978)

Cr(bpy)33+ quenched by O2 at partial pressure (2, 10) x 104 Pa
Solvent : H2O, 22ºC, ionic strength 1.0 (NaCl)

kq = 1.7 x 107(L mol–1 s–1)


Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 63 micro sec.
This value also reported in 776321

Brunschwig, B.; Sutin, N.
J. Am. Chem. Soc. 100: 7568-77 (1978)

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

kq = 2.7 x 107(L mol–1 s–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 66 micro sec. (laser flash, luminescence, multiple shot with signal averaging)

Serpone, N.; Jamieson, M.A.; Henry, M.S.; Hoffman, M.Z.; Bolletta, F.; Maestri, M.
J. Am. Chem. Soc. 101: 2907-16 (1979)

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

kq = 1.7 x 107(L mol–1 s–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 63 micro sec. (conventional flash, absorption, single shot signal)
This value also reported in 78A388

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