'Quenching of Excited States of Metal Complexes

Pt₂[mu-diphosphito(2-)-P,P']₄^4–

excited state quenched by 4,4'-Bis(N,N-dimethylamino)biphenyl

Heuer, W.B.; Totten, M.D.; Rodman, G.S.; Hebert, E.J.; Tracy, H.J.; Nagle, J.K.
J. Am. Chem. Soc. 106: 1163-4 (1984)

Pt₂[mu-diphosphito(2-)-P,P']₄^4– quenched by 4,4'-Bis(N,N-dimethylamino)biphenyl
Solvent : MeOH, ~25ºC

k_q = 3.0 x 10⁹(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 7.1 micro sec. (laser flash, luminescence)

Peterson, J.R.; Kalyanasundaram, K.
J. Phys. Chem. 89: 2486-92 (1985)

Pt₂[mu-diphosphito(2-)-P,P']₄^4– quenched by 4,4'-Bis(N,N-dimethylamino)biphenyl at conc. (1-10) x 10^–4 mol L^–1
Solvent : MeOH

k_q = 6.7 x 10⁸(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air free = 9.4 micro sec. (laser flash, luminescence, multiple shot with signal averaging)

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Pt2[mu-diphosphito(2-)-P,P']44–

Pt₂[mu-diphosphito(2-)-P,P']₄^4–