Mg(5,10,15,20-tetraphenylporphyrin) excited state quenched by Eu3+

Mg(5,10,15,20-tetraphenylporphyrin) quenched by Eu³⁺ at conc. <= 0.0018 mol L^–1
Solvent : Acetonitrile

k_q = 2.1 x 10⁶(L mol^–1 s^–1)

Mechanism: oxidative electron transfer
Experimental methods: conventional flash, absorption, single shot signal
Comments: some Eu²⁺ present