Ascorbate ion Singlet oxygen

Scurlock, R.; Rougee, M.; Bensasson, R.V.
Free Radical Res. Commun. 8, 251-258 (1990)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: CD₃OD

k = 1.5 × 10⁸(L mol^-1 s^-1), T = 293K

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly
Excitation wavelength: 532 nm

Photosensitizer = Hematoporphyrin IX. [Indicator] = 1× 10^-5-10 (mol L^-1).

Rougee, M.; Bensasson, R.V.
C.R. Seances Acad. Sci., Ser. II 302, 1223-1226 (1986)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: D₂O

k = 1.6 × 10⁸(L mol^-1 s^-1), pH ~7, T = 293K

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly
Excitation wavelength: 530 nm

Photosensitizer = 5,10,15,20-Tetrakis(4-sulfonatophenyl)porphine. Added solute 0.9-7.6 × 10^-4.

Egorov, S.Yu.; Krasnovsky, A.A.
Sov. Plant Physiol. 33, 5-8 (1986)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: D₂O

k = 4 × 10⁷(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly
Excitation wavelength: 337.1 nm

Photosensitizer = RF, water-sol. TPP derivs., or Chl a in micelles contg. Triton X-100; counter ion Na⁺.

Rooney, M.L.
Photochem. Photobiol. 38, 619-621 (1983)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Reference Reaction: 9,10-Dimethylanthracene + ¹O₂^* ®
Solvent: Pyridine

k = 1.1 × 10⁷(L mol^-1 s^-1), T = 303K

Experimental method: Chemical reaction
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements using indicator

Indicator = 9,10-Dimethylanthracene; used solvent k_d = 3.1 × 10⁴ s^-1; k for indicator = 2.1 × 10⁷ L/(mol·s); ¹O₂* from MNPO₂.

Rooney, M.L.
Photochem. Photobiol. 38, 619-621 (1983)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: Pyridine

k = 8.4 × 10⁶(L mol^-1 s^-1), T = 303K

Experimental method: Photolysis
Analytical method: vis-UV absorption
Data type: Derived from steady state measurements using indicator

Photosensitizer = 5,10,15,20-Tetraphenylporphine; Indicator = 9,10-Dimethylanthracene; used solvent k_d = 3.1 × 10⁴ s^-1; k for indicator = 2.1 × 10⁷ L/(mol·s).

Chou, P.-T.; Khan, A.U.
Biochem. Biophys. Res. Commun. 115, 932-937 (1983)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: D₂O

k = 2.5 × 10⁶(L mol^-1 s^-1), pH = 7.2

Experimental method: Photolysis
Analytical method: infrared luminescence
Data type: Derived from steady state measurements

Photosensitizer = Chrysenesulfonate ion; used solvent k_d = 1.8 × 10⁴ s^-1.

Chou, P.-T.; Khan, A.U.
Biochem. Biophys. Res. Commun. 115, 932-937 (1983)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: H₂O

k = 8.3 × 10⁶(L mol^-1 s^-1), pH = 6.8

Experimental method: Photolysis
Analytical method: infrared luminescence
Data type: Derived from steady state measurements

Photosensitizer = Chrysenesulfonate ion; used solvent k_d = 2.6 × 10⁵ s^-1.

Byteva, I.M.; Salokhiddinov, K.I.
Opt. Spectrosc. (USSR) 49, 387-390 (1980)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: Pyridine

k = 7 × 10⁷(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly

Photosensitizer = TPP, MPDEE or PdMP.

Byteva, I.M.; Salokhiddinov, K.I.
Opt. Spectrosc. (USSR) 49, 387-390 (1980)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: Acetone

k = 9 × 10⁵(L mol^-1 s^-1)

Experimental method: Flash photolysis
Analytical method: infrared luminescence
Data type: Absolute value measured directly

Photosensitizer = TPP, MPDEE or PdMP.

Koch, E.
Tetrahedron 24, 6295-6318 (1968)

Reaction: Ascorbate ion + ¹O₂^* ® products and/or physical quenching
Solvent: MeOH

Activation energy = 6.3(kJ mol^-1)
b = 1.2 × 10^-2(mol L^-1), T = 293K

Experimental method: Photolysis
Analytical method: oxygen consumption
Data type: Derived from steady state measurements

Photosensitizer = Rose Bengal dianion; meas. k_d/k = 0.012 mol/L.