Ti(oxo)(5,10,15,20-tetraphenylporphyrin) excited state quenched by Ethanol, protonated

Ti(oxo)(5,10,15,20-tetraphenylporphyrin) quenched by Ethanol, protonated at conc. <= 1.5 x 10^–4 mol L^–1
Solvent : EtOH, <=1.5 x 10^–4 mol/L HCl

k_q = 3.4 x 10⁹(L mol^–1 s^–1)

Mechanism: proton transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 35 micro sec.
Comments: HCl assumed to be completely dissociated