Cr(4,7-Ph2phen)33+ excited state quenched by Cr(4,7-Ph2phen)33+

Cr(4,7-Ph₂phen)₃³⁺ quenched by Cr(4,7-Ph₂phen)₃³⁺
Solvent : H₂O/MeOH (1.5/1), 1 mol/L NaCl, BRbuf, 22ºC, pH 9.5

k_q = 3 x 10⁸(L mol^–1 s^–1)

Mechanism: collisional deactivation
Experimental methods: laser flash, luminescence, single shot signal
Lifetime in the absence of quencher, air free = 89 micro sec.
Comments: tau₀ extrap'd to [S] = 0; same k_q with steady state irradiation/quantum yield of a photoproduct, see Mech. [5]

Cr(4,7-Ph₂phen)₃³⁺ quenched by Cr(4,7-Ph₂phen)₃³⁺
Solvent : H₂O/Acetonitrile (24/1), 1 mol/L HCl, 22ºC

k_q = 7.4 x 10⁷(L mol^–1 s^–1)

Mechanism: collisional deactivation
Experimental methods: laser flash, luminescence, single shot signal
Lifetime in the absence of quencher, air free = 570 micro sec.
Comments: tau₀ extrap'd to [S] = 0