Zn(etioporphyrin I) [triplet]

excited state quenched by 4-Nitrotoluene
Roy, J.K.; Carroll, F.A.; Whitten, D.G.
J. Am. Chem. Soc. 96: 6349-55 (1974)

Zn(etioporphyrin I) [triplet] quenched by 4-Nitrotoluene at conc. (1-50) x 10–5 mol L–1
Solvent : Benzene, 25ºC

kq = 3.0 x 109(L mol–1 s–1)
Activation energy = 2.0 (20-78ºC)(kJ mol–1)
Entropy of activation = –71(J K–1 mol–1)

Mechanism: exciplex formation
Experimental methods: conventional flash, absorption, single shot signal
Comments: tau increases at higher [Q]
This value also reported in 72E284

Renge, I.V.; Kuz'min, V.A.; Mironov, A.F.; Borisevich, Yu.E.
Dokl. Phys. Chem. 263(1-3): 181-4 (1982)

Zn(etioporphyrin I) [triplet] quenched by 4-Nitrotoluene
Solvent : Benzene, 25ºC

kq = 3.3 x 109(L mol–1 s–1)

Mechanism: exciplex formation?
Experimental methods: conventional flash, absorption, single shot signal
Comments: see also 85E593

Roy, J.K.; Whitten, D.G.
J. Am. Chem. Soc. 94: 7162-4 (1972)

Zn(etioporphyrin I) [triplet] quenched by 4-Nitrotoluene
Solvent : Benzene, 0.01 mol/L MF

kq = 2 x 108(L mol–1 s–1)

Mechanism: oxidative electron transfer?
Experimental methods: conventional flash, absorption, single shot signal

Roy, J.K.; Whitten, D.G.
J. Am. Chem. Soc. 94: 7162-4 (1972)

Zn(etioporphyrin I) [triplet] quenched by 4-Nitrotoluene
Solvent : MF

kq = 1.3 x 108(L mol–1 s–1)

Mechanism: oxidative electron transfer?
Experimental methods: conventional flash, absorption, single shot signal

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