Ru(5-Brphen)32+ excited state quenched by HgCl42–

Ru(5-Brphen)₃²⁺ quenched by HgCl₄^2–
Solvent : H₂O, 0.01 mol/L HNO₃, [NaNO₃] + [NaCl] = 0.99 mol/L

k_q = 2.5 x 10⁸(L mol^–1 s^–1)

Mechanism: oxidative electron transfer
Experimental methods: laser flash, luminescence, multiple shot with signal averaging
Lifetime in the absence of quencher, air free = 1.3 micro sec.
Comments: k_q from Cl^– titration at fixed [Hg^II]_tot