Pt(CN)42– excited state quenched by NO2–

Pt(CN)₄^2– quenched by NO₂^– at conc. 0.001-0.1 mol L^–1
Solvent : H₂O, 20.5ºC

k_q = 2.3 x 10⁸(L mol^–1 s^–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 0.64 micro sec. (laser flash, luminescence, single shot signal)
Comments: [S] = 0.40 mol/L, as K⁺ salt; forms oligomers

Pt(CN)₄^2– quenched by NO₂^– at conc. 0.014-0.055 mol L^–1
Solvent : H₂O, 21ºC

k_q = 3.1 x 10⁸(L mol^–1 s^–1)

Mechanism: energy transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 0.54 micro sec. (laser flash, luminescence, single shot signal)
Comments: [S] = 0.096 mol/L, as Ba²⁺ salt; forms oligomers