Zn(etioporphyrin I) [triplet] excited state quenched by alpha-Bromo-4-nitrotoluene

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

k_q = 1.5 x 10⁹(L mol^–1 s^–1)

Mechanism: exciplex formation
Experimental methods: conventional flash, absorption, single shot signal
Comments: nonlinear Stern-Volmer plot at higher [Q]