Zn(etioporphyrin I) [triplet]

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

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

kq = 1.2 x 108(L mol–1 s–1)
Activation energy = 3.1 (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: nonlinear Stern-Volmer plot at higher [Q]

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