Zn(protoporphyrin) excited state quenched by 1,4-Benzoquinone

Zn(protoporphyrin) quenched by 1,4-Benzoquinone
Solvent : EtOH

k_q = 7 x 10⁹(L mol^–1 s^–1)

Experimental methods: laser flash, luminescence,
Lifetime in the absence of quencher, air free = 280 micro sec.