'Quenching of Excited States of Metal Complexes

UO₂²⁺

excited state quenched by Ce³⁺

Moriyasu, M.; Yokoyama, Y.; Ikeda, S.
J. Inorg. Nucl. Chem. 39: 2205-9 (1977)

UO₂²⁺ quenched by Ce³⁺
Solvent : H₂O, 1 mol/L H₃PO₄, 25ºC

k_q = 2.1 x 10⁸(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: conventional flash, luminescence, , luminescence
Lifetime in the absence of quencher, air saturated = 180 micro sec.

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺ at conc. 0.008-0.04 mol L^–1
Solvent : H₂O

k_q = 2.0 x 10⁹(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 1.4 micro sec.
Comments: S as NO₃^– salt

Burrows, H.D.; Formosinho, S.J.; da Graca Miguel, M.; Coelho, F.P.
J. Chem. Soc., Faraday Trans. 1 72: 163-71 (1976)

UO₂²⁺ quenched by Ce³⁺
Solvent : H₂O, pH 2.0-2.5 (HNO₃)

k_q = 3.1 x 10⁵(L mol^–1 s^–1)

Mechanism: reductive electron transfer?
Experimental methods: steady state irradiation, luminescence
Lifetime in the absence of quencher, air saturated = 1.2 micro sec. (747132)
Comments: S as NO₃^– salt

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺
Solvent : H₂O, 0.09 mol/L H₂SO₄

k_q = 1.1 x 10⁸(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 2.4 micro sec.
Comments: tau₀ depends on [S]; S as SO₄^2– salt

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺
Solvent : H₂O, 0.4-0.5 mol/L H₂SO₄

k_q = 5.0 x 10⁷(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 4.3 micro sec.
Comments: tau₀ depends on [S]; S as SO₄^2– salt

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺ at conc. 0.008-0.04 mol L^–1
Solvent : H₂O, 0.2-2 mol/L HNO₃

k_q = ~1 x 10⁷(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = ~2.0 micro sec.
Comments: S as NO₃^– salt

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺ at conc. 0.41 mol L^–1
Solvent : H₂O, 0.5 mol/L HClO₄

k_q = 1.3 x 10⁶(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 3.4 micro sec.
Comments: S as ClO₄^– salt

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺ at conc. 0.45 mol L^–1
Solvent : H₂O, 1 mol/L HClO₄

k_q = 2.6 x 10⁶(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 5.6 micro sec.
Comments: S as ClO₄^– salt

Rosenfeld-Grunwald, T.; Brandeis, M.; Rabani, J.
J. Phys. Chem. 86: 4745-50 (1982)

UO₂²⁺ quenched by Ce³⁺ at conc. 0.45 mol L^–1
Solvent : H₂O, 2 mol/L HClO₄

k_q = 3.4 x 10⁶(L mol^–1 s^–1)

Mechanism: reductive electron transfer
Experimental methods: laser flash, absorption, single shot signal
Lifetime in the absence of quencher, air free = 6.7 micro sec.
Comments: S as ClO₄^– salt

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UO22+

UO₂²⁺