Mg(etioporphyrin I) [triplet] excited state quenched by 4-Nitrotoluene

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

k_q = 1.4 x 10⁹(L mol^–1 s^–1)

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