'Quenching of Excited States of Metal Complexes

Zn(etioporphyrin I) [singlet]

excited state quenched by cis-4-Nitrostilbene

Lopp, I.G.; Hendren, R.W.; Wildes, P.D.; Whitten, D.G.
J. Am. Chem. Soc. 92: 6440-7 (1970)

Zn(etioporphyrin I) [singlet] quenched by cis-4-Nitrostilbene
Solvent : Benzene

k_q = 3.7 x 10⁹(L mol^–1 s^–1)

Mechanism: exciplex formation
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 0.004 micro sec. (laser flash, luminescence, single shot signal)
Comments: nonlinear Stern-Volmer plot at high [Q]; K_SV = 29 L/mol in 68A001

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