Zn(2,3,7,8,12,13,17,18-octaethylporphyrin) [triplet]

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

Zn(2,3,7,8,12,13,17,18-octaethylporphyrin) [triplet] quenched by DDT at conc. (1-50) x 10–5 mol L–1
Solvent : Benzene, 25ºC

kq = 3 x 107(L mol–1 s–1)
Activation energy = 13 (20-78ºC)(kJ mol–1)
Entropy of activation = –67(J K–1 mol–1)

Mechanism: exciplex formation
Experimental methods: conventional flash, absorption, single shot signal
Comments: tau constant at higher [Q]

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