Cr(4,7-Me2phen)33+

excited state quenched by O2
Brunschwig, B.; Sutin, N.
J. Am. Chem. Soc. 100: 7568-77 (1978)

Cr(4,7-Me2phen)33+ quenched by O2 at conc. (2.5, 12) x 10–4 mol L–1
Solvent : H2O, 1 mol/L HCl, 25ºC

kq = 8.8 x 107(L mol–1 s–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 580 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(4,7-Me2phen)33+ quenched by O2 at conc. (2.5, 12) x 10–4 mol L–1
Solvent : H2O, 1 mol/L HCl, 25ºC

kq = 1.9 x 108(L mol–1 s–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 340 micro sec. (conventional flash, absorption, single shot signal)
This value also reported in 78A388

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